1784 lines
74 KiB
C
1784 lines
74 KiB
C
|
/*
|
||
|
* Copyright (C)2009-2015, 2017, 2020-2021, 2023 D. R. Commander.
|
||
|
* All Rights Reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions are met:
|
||
|
*
|
||
|
* - Redistributions of source code must retain the above copyright notice,
|
||
|
* this list of conditions and the following disclaimer.
|
||
|
* - Redistributions in binary form must reproduce the above copyright notice,
|
||
|
* this list of conditions and the following disclaimer in the documentation
|
||
|
* and/or other materials provided with the distribution.
|
||
|
* - Neither the name of the libjpeg-turbo Project nor the names of its
|
||
|
* contributors may be used to endorse or promote products derived from this
|
||
|
* software without specific prior written permission.
|
||
|
*
|
||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
|
||
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
|
||
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
*/
|
||
|
|
||
|
#ifndef __TURBOJPEG_H__
|
||
|
#define __TURBOJPEG_H__
|
||
|
|
||
|
#if defined(_WIN32) && defined(DLLDEFINE)
|
||
|
#define DLLEXPORT __declspec(dllexport)
|
||
|
#else
|
||
|
#define DLLEXPORT
|
||
|
#endif
|
||
|
#define DLLCALL
|
||
|
|
||
|
|
||
|
/**
|
||
|
* @addtogroup TurboJPEG
|
||
|
* TurboJPEG API. This API provides an interface for generating, decoding, and
|
||
|
* transforming planar YUV and JPEG images in memory.
|
||
|
*
|
||
|
* @anchor YUVnotes
|
||
|
* YUV Image Format Notes
|
||
|
* ----------------------
|
||
|
* Technically, the JPEG format uses the YCbCr colorspace (which is technically
|
||
|
* not a colorspace but a color transform), but per the convention of the
|
||
|
* digital video community, the TurboJPEG API uses "YUV" to refer to an image
|
||
|
* format consisting of Y, Cb, and Cr image planes.
|
||
|
*
|
||
|
* Each plane is simply a 2D array of bytes, each byte representing the value
|
||
|
* of one of the components (Y, Cb, or Cr) at a particular location in the
|
||
|
* image. The width and height of each plane are determined by the image
|
||
|
* width, height, and level of chrominance subsampling. The luminance plane
|
||
|
* width is the image width padded to the nearest multiple of the horizontal
|
||
|
* subsampling factor (1 in the case of 4:4:4, grayscale, or 4:4:0; 2 in the
|
||
|
* case of 4:2:2 or 4:2:0; 4 in the case of 4:1:1.) Similarly, the luminance
|
||
|
* plane height is the image height padded to the nearest multiple of the
|
||
|
* vertical subsampling factor (1 in the case of 4:4:4, 4:2:2, grayscale, or
|
||
|
* 4:1:1; 2 in the case of 4:2:0 or 4:4:0.) This is irrespective of any
|
||
|
* additional padding that may be specified as an argument to the various YUV
|
||
|
* functions. The chrominance plane width is equal to the luminance plane
|
||
|
* width divided by the horizontal subsampling factor, and the chrominance
|
||
|
* plane height is equal to the luminance plane height divided by the vertical
|
||
|
* subsampling factor.
|
||
|
*
|
||
|
* For example, if the source image is 35 x 35 pixels and 4:2:2 subsampling is
|
||
|
* used, then the luminance plane would be 36 x 35 bytes, and each of the
|
||
|
* chrominance planes would be 18 x 35 bytes. If you specify a row alignment
|
||
|
* of 4 bytes on top of this, then the luminance plane would be 36 x 35 bytes,
|
||
|
* and each of the chrominance planes would be 20 x 35 bytes.
|
||
|
*
|
||
|
* @{
|
||
|
*/
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The number of chrominance subsampling options
|
||
|
*/
|
||
|
#define TJ_NUMSAMP 6
|
||
|
|
||
|
/**
|
||
|
* Chrominance subsampling options.
|
||
|
* When pixels are converted from RGB to YCbCr (see #TJCS_YCbCr) or from CMYK
|
||
|
* to YCCK (see #TJCS_YCCK) as part of the JPEG compression process, some of
|
||
|
* the Cb and Cr (chrominance) components can be discarded or averaged together
|
||
|
* to produce a smaller image with little perceptible loss of image clarity.
|
||
|
* (The human eye is more sensitive to small changes in brightness than to
|
||
|
* small changes in color.) This is called "chrominance subsampling".
|
||
|
*/
|
||
|
enum TJSAMP {
|
||
|
/**
|
||
|
* 4:4:4 chrominance subsampling (no chrominance subsampling). The JPEG or
|
||
|
* YUV image will contain one chrominance component for every pixel in the
|
||
|
* source image.
|
||
|
*/
|
||
|
TJSAMP_444 = 0,
|
||
|
/**
|
||
|
* 4:2:2 chrominance subsampling. The JPEG or YUV image will contain one
|
||
|
* chrominance component for every 2x1 block of pixels in the source image.
|
||
|
*/
|
||
|
TJSAMP_422,
|
||
|
/**
|
||
|
* 4:2:0 chrominance subsampling. The JPEG or YUV image will contain one
|
||
|
* chrominance component for every 2x2 block of pixels in the source image.
|
||
|
*/
|
||
|
TJSAMP_420,
|
||
|
/**
|
||
|
* Grayscale. The JPEG or YUV image will contain no chrominance components.
|
||
|
*/
|
||
|
TJSAMP_GRAY,
|
||
|
/**
|
||
|
* 4:4:0 chrominance subsampling. The JPEG or YUV image will contain one
|
||
|
* chrominance component for every 1x2 block of pixels in the source image.
|
||
|
*
|
||
|
* @note 4:4:0 subsampling is not fully accelerated in libjpeg-turbo.
|
||
|
*/
|
||
|
TJSAMP_440,
|
||
|
/**
|
||
|
* 4:1:1 chrominance subsampling. The JPEG or YUV image will contain one
|
||
|
* chrominance component for every 4x1 block of pixels in the source image.
|
||
|
* JPEG images compressed with 4:1:1 subsampling will be almost exactly the
|
||
|
* same size as those compressed with 4:2:0 subsampling, and in the
|
||
|
* aggregate, both subsampling methods produce approximately the same
|
||
|
* perceptual quality. However, 4:1:1 is better able to reproduce sharp
|
||
|
* horizontal features.
|
||
|
*
|
||
|
* @note 4:1:1 subsampling is not fully accelerated in libjpeg-turbo.
|
||
|
*/
|
||
|
TJSAMP_411
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* MCU block width (in pixels) for a given level of chrominance subsampling.
|
||
|
* MCU block sizes:
|
||
|
* - 8x8 for no subsampling or grayscale
|
||
|
* - 16x8 for 4:2:2
|
||
|
* - 8x16 for 4:4:0
|
||
|
* - 16x16 for 4:2:0
|
||
|
* - 32x8 for 4:1:1
|
||
|
*/
|
||
|
static const int tjMCUWidth[TJ_NUMSAMP] = { 8, 16, 16, 8, 8, 32 };
|
||
|
|
||
|
/**
|
||
|
* MCU block height (in pixels) for a given level of chrominance subsampling.
|
||
|
* MCU block sizes:
|
||
|
* - 8x8 for no subsampling or grayscale
|
||
|
* - 16x8 for 4:2:2
|
||
|
* - 8x16 for 4:4:0
|
||
|
* - 16x16 for 4:2:0
|
||
|
* - 32x8 for 4:1:1
|
||
|
*/
|
||
|
static const int tjMCUHeight[TJ_NUMSAMP] = { 8, 8, 16, 8, 16, 8 };
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The number of pixel formats
|
||
|
*/
|
||
|
#define TJ_NUMPF 12
|
||
|
|
||
|
/**
|
||
|
* Pixel formats
|
||
|
*/
|
||
|
enum TJPF {
|
||
|
/**
|
||
|
* RGB pixel format. The red, green, and blue components in the image are
|
||
|
* stored in 3-byte pixels in the order R, G, B from lowest to highest byte
|
||
|
* address within each pixel.
|
||
|
*/
|
||
|
TJPF_RGB = 0,
|
||
|
/**
|
||
|
* BGR pixel format. The red, green, and blue components in the image are
|
||
|
* stored in 3-byte pixels in the order B, G, R from lowest to highest byte
|
||
|
* address within each pixel.
|
||
|
*/
|
||
|
TJPF_BGR,
|
||
|
/**
|
||
|
* RGBX pixel format. The red, green, and blue components in the image are
|
||
|
* stored in 4-byte pixels in the order R, G, B from lowest to highest byte
|
||
|
* address within each pixel. The X component is ignored when compressing
|
||
|
* and undefined when decompressing.
|
||
|
*/
|
||
|
TJPF_RGBX,
|
||
|
/**
|
||
|
* BGRX pixel format. The red, green, and blue components in the image are
|
||
|
* stored in 4-byte pixels in the order B, G, R from lowest to highest byte
|
||
|
* address within each pixel. The X component is ignored when compressing
|
||
|
* and undefined when decompressing.
|
||
|
*/
|
||
|
TJPF_BGRX,
|
||
|
/**
|
||
|
* XBGR pixel format. The red, green, and blue components in the image are
|
||
|
* stored in 4-byte pixels in the order R, G, B from highest to lowest byte
|
||
|
* address within each pixel. The X component is ignored when compressing
|
||
|
* and undefined when decompressing.
|
||
|
*/
|
||
|
TJPF_XBGR,
|
||
|
/**
|
||
|
* XRGB pixel format. The red, green, and blue components in the image are
|
||
|
* stored in 4-byte pixels in the order B, G, R from highest to lowest byte
|
||
|
* address within each pixel. The X component is ignored when compressing
|
||
|
* and undefined when decompressing.
|
||
|
*/
|
||
|
TJPF_XRGB,
|
||
|
/**
|
||
|
* Grayscale pixel format. Each 1-byte pixel represents a luminance
|
||
|
* (brightness) level from 0 to 255.
|
||
|
*/
|
||
|
TJPF_GRAY,
|
||
|
/**
|
||
|
* RGBA pixel format. This is the same as @ref TJPF_RGBX, except that when
|
||
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
||
|
* interpreted as an opaque alpha channel.
|
||
|
*/
|
||
|
TJPF_RGBA,
|
||
|
/**
|
||
|
* BGRA pixel format. This is the same as @ref TJPF_BGRX, except that when
|
||
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
||
|
* interpreted as an opaque alpha channel.
|
||
|
*/
|
||
|
TJPF_BGRA,
|
||
|
/**
|
||
|
* ABGR pixel format. This is the same as @ref TJPF_XBGR, except that when
|
||
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
||
|
* interpreted as an opaque alpha channel.
|
||
|
*/
|
||
|
TJPF_ABGR,
|
||
|
/**
|
||
|
* ARGB pixel format. This is the same as @ref TJPF_XRGB, except that when
|
||
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
||
|
* interpreted as an opaque alpha channel.
|
||
|
*/
|
||
|
TJPF_ARGB,
|
||
|
/**
|
||
|
* CMYK pixel format. Unlike RGB, which is an additive color model used
|
||
|
* primarily for display, CMYK (Cyan/Magenta/Yellow/Key) is a subtractive
|
||
|
* color model used primarily for printing. In the CMYK color model, the
|
||
|
* value of each color component typically corresponds to an amount of cyan,
|
||
|
* magenta, yellow, or black ink that is applied to a white background. In
|
||
|
* order to convert between CMYK and RGB, it is necessary to use a color
|
||
|
* management system (CMS.) A CMS will attempt to map colors within the
|
||
|
* printer's gamut to perceptually similar colors in the display's gamut and
|
||
|
* vice versa, but the mapping is typically not 1:1 or reversible, nor can it
|
||
|
* be defined with a simple formula. Thus, such a conversion is out of scope
|
||
|
* for a codec library. However, the TurboJPEG API allows for compressing
|
||
|
* packed-pixel CMYK images into YCCK JPEG images (see #TJCS_YCCK) and
|
||
|
* decompressing YCCK JPEG images into packed-pixel CMYK images.
|
||
|
*/
|
||
|
TJPF_CMYK,
|
||
|
/**
|
||
|
* Unknown pixel format. Currently this is only used by #tjLoadImage().
|
||
|
*/
|
||
|
TJPF_UNKNOWN = -1
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Red offset (in bytes) for a given pixel format. This specifies the number
|
||
|
* of bytes that the red component is offset from the start of the pixel. For
|
||
|
* instance, if a pixel of format TJPF_BGRX is stored in
|
||
|
* `unsigned char pixel[]`, then the red component will be
|
||
|
*`pixel[tjRedOffset[TJPF_BGRX]]`. This will be -1 if the pixel format does
|
||
|
* not have a red component.
|
||
|
*/
|
||
|
static const int tjRedOffset[TJ_NUMPF] = {
|
||
|
0, 2, 0, 2, 3, 1, -1, 0, 2, 3, 1, -1
|
||
|
};
|
||
|
/**
|
||
|
* Green offset (in bytes) for a given pixel format. This specifies the number
|
||
|
* of bytes that the green component is offset from the start of the pixel.
|
||
|
* For instance, if a pixel of format TJPF_BGRX is stored in
|
||
|
* `unsigned char pixel[]`, then the green component will be
|
||
|
* `pixel[tjGreenOffset[TJPF_BGRX]]`. This will be -1 if the pixel format does
|
||
|
* not have a green component.
|
||
|
*/
|
||
|
static const int tjGreenOffset[TJ_NUMPF] = {
|
||
|
1, 1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1
|
||
|
};
|
||
|
/**
|
||
|
* Blue offset (in bytes) for a given pixel format. This specifies the number
|
||
|
* of bytes that the blue component is offset from the start of the pixel. For
|
||
|
* instance, if a pixel of format TJPF_BGRX is stored in
|
||
|
* `unsigned char pixel[]`, then the blue component will be
|
||
|
* `pixel[tjBlueOffset[TJPF_BGRX]]`. This will be -1 if the pixel format does
|
||
|
* not have a blue component.
|
||
|
*/
|
||
|
static const int tjBlueOffset[TJ_NUMPF] = {
|
||
|
2, 0, 2, 0, 1, 3, -1, 2, 0, 1, 3, -1
|
||
|
};
|
||
|
/**
|
||
|
* Alpha offset (in bytes) for a given pixel format. This specifies the number
|
||
|
* of bytes that the alpha component is offset from the start of the pixel.
|
||
|
* For instance, if a pixel of format TJPF_BGRA is stored in
|
||
|
* `unsigned char pixel[]`, then the alpha component will be
|
||
|
* `pixel[tjAlphaOffset[TJPF_BGRA]]`. This will be -1 if the pixel format does
|
||
|
* not have an alpha component.
|
||
|
*/
|
||
|
static const int tjAlphaOffset[TJ_NUMPF] = {
|
||
|
-1, -1, -1, -1, -1, -1, -1, 3, 3, 0, 0, -1
|
||
|
};
|
||
|
/**
|
||
|
* Pixel size (in bytes) for a given pixel format
|
||
|
*/
|
||
|
static const int tjPixelSize[TJ_NUMPF] = {
|
||
|
3, 3, 4, 4, 4, 4, 1, 4, 4, 4, 4, 4
|
||
|
};
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The number of JPEG colorspaces
|
||
|
*/
|
||
|
#define TJ_NUMCS 5
|
||
|
|
||
|
/**
|
||
|
* JPEG colorspaces
|
||
|
*/
|
||
|
enum TJCS {
|
||
|
/**
|
||
|
* RGB colorspace. When compressing the JPEG image, the R, G, and B
|
||
|
* components in the source image are reordered into image planes, but no
|
||
|
* colorspace conversion or subsampling is performed. RGB JPEG images can be
|
||
|
* decompressed to packed-pixel images with any of the extended RGB or
|
||
|
* grayscale pixel formats, but they cannot be decompressed to planar YUV
|
||
|
* images.
|
||
|
*/
|
||
|
TJCS_RGB = 0,
|
||
|
/**
|
||
|
* YCbCr colorspace. YCbCr is not an absolute colorspace but rather a
|
||
|
* mathematical transformation of RGB designed solely for storage and
|
||
|
* transmission. YCbCr images must be converted to RGB before they can
|
||
|
* actually be displayed. In the YCbCr colorspace, the Y (luminance)
|
||
|
* component represents the black & white portion of the original image, and
|
||
|
* the Cb and Cr (chrominance) components represent the color portion of the
|
||
|
* original image. Originally, the analog equivalent of this transformation
|
||
|
* allowed the same signal to drive both black & white and color televisions,
|
||
|
* but JPEG images use YCbCr primarily because it allows the color data to be
|
||
|
* optionally subsampled for the purposes of reducing network or disk usage.
|
||
|
* YCbCr is the most common JPEG colorspace, and YCbCr JPEG images can be
|
||
|
* compressed from and decompressed to packed-pixel images with any of the
|
||
|
* extended RGB or grayscale pixel formats. YCbCr JPEG images can also be
|
||
|
* compressed from and decompressed to planar YUV images.
|
||
|
*/
|
||
|
TJCS_YCbCr,
|
||
|
/**
|
||
|
* Grayscale colorspace. The JPEG image retains only the luminance data (Y
|
||
|
* component), and any color data from the source image is discarded.
|
||
|
* Grayscale JPEG images can be compressed from and decompressed to
|
||
|
* packed-pixel images with any of the extended RGB or grayscale pixel
|
||
|
* formats, or they can be compressed from and decompressed to planar YUV
|
||
|
* images.
|
||
|
*/
|
||
|
TJCS_GRAY,
|
||
|
/**
|
||
|
* CMYK colorspace. When compressing the JPEG image, the C, M, Y, and K
|
||
|
* components in the source image are reordered into image planes, but no
|
||
|
* colorspace conversion or subsampling is performed. CMYK JPEG images can
|
||
|
* only be decompressed to packed-pixel images with the CMYK pixel format.
|
||
|
*/
|
||
|
TJCS_CMYK,
|
||
|
/**
|
||
|
* YCCK colorspace. YCCK (AKA "YCbCrK") is not an absolute colorspace but
|
||
|
* rather a mathematical transformation of CMYK designed solely for storage
|
||
|
* and transmission. It is to CMYK as YCbCr is to RGB. CMYK pixels can be
|
||
|
* reversibly transformed into YCCK, and as with YCbCr, the chrominance
|
||
|
* components in the YCCK pixels can be subsampled without incurring major
|
||
|
* perceptual loss. YCCK JPEG images can only be compressed from and
|
||
|
* decompressed to packed-pixel images with the CMYK pixel format.
|
||
|
*/
|
||
|
TJCS_YCCK
|
||
|
};
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Rows in the packed-pixel source/destination image are stored in bottom-up
|
||
|
* (Windows, OpenGL) order rather than in top-down (X11) order.
|
||
|
*/
|
||
|
#define TJFLAG_BOTTOMUP 2
|
||
|
/**
|
||
|
* When decompressing an image that was compressed using chrominance
|
||
|
* subsampling, use the fastest chrominance upsampling algorithm available.
|
||
|
* The default is to use smooth upsampling, which creates a smooth transition
|
||
|
* between neighboring chrominance components in order to reduce upsampling
|
||
|
* artifacts in the decompressed image.
|
||
|
*/
|
||
|
#define TJFLAG_FASTUPSAMPLE 256
|
||
|
/**
|
||
|
* Disable JPEG buffer (re)allocation. If passed to one of the JPEG
|
||
|
* compression or transform functions, this flag will cause those functions to
|
||
|
* generate an error if the JPEG destination buffer is invalid or too small,
|
||
|
* rather than attempt to allocate or reallocate that buffer.
|
||
|
*/
|
||
|
#define TJFLAG_NOREALLOC 1024
|
||
|
/**
|
||
|
* Use the fastest DCT/IDCT algorithm available. The default if this flag is
|
||
|
* not specified is implementation-specific. For example, the implementation
|
||
|
* of the TurboJPEG API in libjpeg-turbo uses the fast algorithm by default
|
||
|
* when compressing, because this has been shown to have only a very slight
|
||
|
* effect on accuracy, but it uses the accurate algorithm when decompressing,
|
||
|
* because this has been shown to have a larger effect.
|
||
|
*/
|
||
|
#define TJFLAG_FASTDCT 2048
|
||
|
/**
|
||
|
* Use the most accurate DCT/IDCT algorithm available. The default if this
|
||
|
* flag is not specified is implementation-specific. For example, the
|
||
|
* implementation of the TurboJPEG API in libjpeg-turbo uses the fast algorithm
|
||
|
* by default when compressing, because this has been shown to have only a very
|
||
|
* slight effect on accuracy, but it uses the accurate algorithm when
|
||
|
* decompressing, because this has been shown to have a larger effect.
|
||
|
*/
|
||
|
#define TJFLAG_ACCURATEDCT 4096
|
||
|
/**
|
||
|
* Immediately discontinue the current compression/decompression/transform
|
||
|
* operation if a warning (non-fatal error) occurs. The default behavior is to
|
||
|
* allow the operation to complete unless a fatal error is encountered.
|
||
|
*/
|
||
|
#define TJFLAG_STOPONWARNING 8192
|
||
|
/**
|
||
|
* Use progressive entropy coding in JPEG images generated by the compression
|
||
|
* and transform functions. Progressive entropy coding will generally improve
|
||
|
* compression relative to baseline entropy coding (the default), but it will
|
||
|
* reduce compression and decompression performance considerably.
|
||
|
*/
|
||
|
#define TJFLAG_PROGRESSIVE 16384
|
||
|
/**
|
||
|
* Limit the number of progressive JPEG scans that the decompression and
|
||
|
* transform functions will process. If a progressive JPEG image contains an
|
||
|
* unreasonably large number of scans, then this flag will cause the
|
||
|
* decompression and transform functions to return an error. The primary
|
||
|
* purpose of this is to allow security-critical applications to guard against
|
||
|
* an exploit of the progressive JPEG format described in
|
||
|
* <a href="https://libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf" target="_blank">this report</a>.
|
||
|
*/
|
||
|
#define TJFLAG_LIMITSCANS 32768
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The number of error codes
|
||
|
*/
|
||
|
#define TJ_NUMERR 2
|
||
|
|
||
|
/**
|
||
|
* Error codes
|
||
|
*/
|
||
|
enum TJERR {
|
||
|
/**
|
||
|
* The error was non-fatal and recoverable, but the destination image may
|
||
|
* still be corrupt.
|
||
|
*/
|
||
|
TJERR_WARNING = 0,
|
||
|
/**
|
||
|
* The error was fatal and non-recoverable.
|
||
|
*/
|
||
|
TJERR_FATAL
|
||
|
};
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The number of transform operations
|
||
|
*/
|
||
|
#define TJ_NUMXOP 8
|
||
|
|
||
|
/**
|
||
|
* Transform operations for #tjTransform()
|
||
|
*/
|
||
|
enum TJXOP {
|
||
|
/**
|
||
|
* Do not transform the position of the image pixels
|
||
|
*/
|
||
|
TJXOP_NONE = 0,
|
||
|
/**
|
||
|
* Flip (mirror) image horizontally. This transform is imperfect if there
|
||
|
* are any partial MCU blocks on the right edge (see #TJXOPT_PERFECT.)
|
||
|
*/
|
||
|
TJXOP_HFLIP,
|
||
|
/**
|
||
|
* Flip (mirror) image vertically. This transform is imperfect if there are
|
||
|
* any partial MCU blocks on the bottom edge (see #TJXOPT_PERFECT.)
|
||
|
*/
|
||
|
TJXOP_VFLIP,
|
||
|
/**
|
||
|
* Transpose image (flip/mirror along upper left to lower right axis.) This
|
||
|
* transform is always perfect.
|
||
|
*/
|
||
|
TJXOP_TRANSPOSE,
|
||
|
/**
|
||
|
* Transverse transpose image (flip/mirror along upper right to lower left
|
||
|
* axis.) This transform is imperfect if there are any partial MCU blocks in
|
||
|
* the image (see #TJXOPT_PERFECT.)
|
||
|
*/
|
||
|
TJXOP_TRANSVERSE,
|
||
|
/**
|
||
|
* Rotate image clockwise by 90 degrees. This transform is imperfect if
|
||
|
* there are any partial MCU blocks on the bottom edge (see
|
||
|
* #TJXOPT_PERFECT.)
|
||
|
*/
|
||
|
TJXOP_ROT90,
|
||
|
/**
|
||
|
* Rotate image 180 degrees. This transform is imperfect if there are any
|
||
|
* partial MCU blocks in the image (see #TJXOPT_PERFECT.)
|
||
|
*/
|
||
|
TJXOP_ROT180,
|
||
|
/**
|
||
|
* Rotate image counter-clockwise by 90 degrees. This transform is imperfect
|
||
|
* if there are any partial MCU blocks on the right edge (see
|
||
|
* #TJXOPT_PERFECT.)
|
||
|
*/
|
||
|
TJXOP_ROT270
|
||
|
};
|
||
|
|
||
|
|
||
|
/**
|
||
|
* This option will cause #tjTransform() to return an error if the transform is
|
||
|
* not perfect. Lossless transforms operate on MCU blocks, whose size depends
|
||
|
* on the level of chrominance subsampling used (see #tjMCUWidth and
|
||
|
* #tjMCUHeight.) If the image's width or height is not evenly divisible by
|
||
|
* the MCU block size, then there will be partial MCU blocks on the right
|
||
|
* and/or bottom edges. It is not possible to move these partial MCU blocks to
|
||
|
* the top or left of the image, so any transform that would require that is
|
||
|
* "imperfect." If this option is not specified, then any partial MCU blocks
|
||
|
* that cannot be transformed will be left in place, which will create
|
||
|
* odd-looking strips on the right or bottom edge of the image.
|
||
|
*/
|
||
|
#define TJXOPT_PERFECT 1
|
||
|
/**
|
||
|
* This option will cause #tjTransform() to discard any partial MCU blocks that
|
||
|
* cannot be transformed.
|
||
|
*/
|
||
|
#define TJXOPT_TRIM 2
|
||
|
/**
|
||
|
* This option will enable lossless cropping. See #tjTransform() for more
|
||
|
* information.
|
||
|
*/
|
||
|
#define TJXOPT_CROP 4
|
||
|
/**
|
||
|
* This option will discard the color data in the source image and produce a
|
||
|
* grayscale destination image.
|
||
|
*/
|
||
|
#define TJXOPT_GRAY 8
|
||
|
/**
|
||
|
* This option will prevent #tjTransform() from outputting a JPEG image for
|
||
|
* this particular transform. (This can be used in conjunction with a custom
|
||
|
* filter to capture the transformed DCT coefficients without transcoding
|
||
|
* them.)
|
||
|
*/
|
||
|
#define TJXOPT_NOOUTPUT 16
|
||
|
/**
|
||
|
* This option will enable progressive entropy coding in the JPEG image
|
||
|
* generated by this particular transform. Progressive entropy coding will
|
||
|
* generally improve compression relative to baseline entropy coding (the
|
||
|
* default), but it will reduce decompression performance considerably.
|
||
|
*/
|
||
|
#define TJXOPT_PROGRESSIVE 32
|
||
|
/**
|
||
|
* This option will prevent #tjTransform() from copying any extra markers
|
||
|
* (including EXIF and ICC profile data) from the source image to the
|
||
|
* destination image.
|
||
|
*/
|
||
|
#define TJXOPT_COPYNONE 64
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Scaling factor
|
||
|
*/
|
||
|
typedef struct {
|
||
|
/**
|
||
|
* Numerator
|
||
|
*/
|
||
|
int num;
|
||
|
/**
|
||
|
* Denominator
|
||
|
*/
|
||
|
int denom;
|
||
|
} tjscalingfactor;
|
||
|
|
||
|
/**
|
||
|
* Cropping region
|
||
|
*/
|
||
|
typedef struct {
|
||
|
/**
|
||
|
* The left boundary of the cropping region. This must be evenly divisible
|
||
|
* by the MCU block width (see #tjMCUWidth.)
|
||
|
*/
|
||
|
int x;
|
||
|
/**
|
||
|
* The upper boundary of the cropping region. This must be evenly divisible
|
||
|
* by the MCU block height (see #tjMCUHeight.)
|
||
|
*/
|
||
|
int y;
|
||
|
/**
|
||
|
* The width of the cropping region. Setting this to 0 is the equivalent of
|
||
|
* setting it to the width of the source JPEG image - x.
|
||
|
*/
|
||
|
int w;
|
||
|
/**
|
||
|
* The height of the cropping region. Setting this to 0 is the equivalent of
|
||
|
* setting it to the height of the source JPEG image - y.
|
||
|
*/
|
||
|
int h;
|
||
|
} tjregion;
|
||
|
|
||
|
/**
|
||
|
* Lossless transform
|
||
|
*/
|
||
|
typedef struct tjtransform {
|
||
|
/**
|
||
|
* Cropping region
|
||
|
*/
|
||
|
tjregion r;
|
||
|
/**
|
||
|
* One of the @ref TJXOP "transform operations"
|
||
|
*/
|
||
|
int op;
|
||
|
/**
|
||
|
* The bitwise OR of one of more of the @ref TJXOPT_COPYNONE
|
||
|
* "transform options"
|
||
|
*/
|
||
|
int options;
|
||
|
/**
|
||
|
* Arbitrary data that can be accessed within the body of the callback
|
||
|
* function
|
||
|
*/
|
||
|
void *data;
|
||
|
/**
|
||
|
* A callback function that can be used to modify the DCT coefficients after
|
||
|
* they are losslessly transformed but before they are transcoded to a new
|
||
|
* JPEG image. This allows for custom filters or other transformations to be
|
||
|
* applied in the frequency domain.
|
||
|
*
|
||
|
* @param coeffs pointer to an array of transformed DCT coefficients. (NOTE:
|
||
|
* this pointer is not guaranteed to be valid once the callback returns, so
|
||
|
* applications wishing to hand off the DCT coefficients to another function
|
||
|
* or library should make a copy of them within the body of the callback.)
|
||
|
*
|
||
|
* @param arrayRegion #tjregion structure containing the width and height of
|
||
|
* the array pointed to by `coeffs` as well as its offset relative to the
|
||
|
* component plane. TurboJPEG implementations may choose to split each
|
||
|
* component plane into multiple DCT coefficient arrays and call the callback
|
||
|
* function once for each array.
|
||
|
*
|
||
|
* @param planeRegion #tjregion structure containing the width and height of
|
||
|
* the component plane to which `coeffs` belongs
|
||
|
*
|
||
|
* @param componentID ID number of the component plane to which `coeffs`
|
||
|
* belongs. (Y, Cb, and Cr have, respectively, ID's of 0, 1, and 2 in
|
||
|
* typical JPEG images.)
|
||
|
*
|
||
|
* @param transformID ID number of the transformed image to which `coeffs`
|
||
|
* belongs. This is the same as the index of the transform in the
|
||
|
* `transforms` array that was passed to #tjTransform().
|
||
|
*
|
||
|
* @param transform a pointer to a #tjtransform structure that specifies the
|
||
|
* parameters and/or cropping region for this transform
|
||
|
*
|
||
|
* @return 0 if the callback was successful, or -1 if an error occurred.
|
||
|
*/
|
||
|
int (*customFilter) (short *coeffs, tjregion arrayRegion,
|
||
|
tjregion planeRegion, int componentIndex,
|
||
|
int transformIndex, struct tjtransform *transform);
|
||
|
} tjtransform;
|
||
|
|
||
|
/**
|
||
|
* TurboJPEG instance handle
|
||
|
*/
|
||
|
typedef void *tjhandle;
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Pad the given width to the nearest multiple of 4
|
||
|
*/
|
||
|
#define TJPAD(width) (((width) + 3) & (~3))
|
||
|
|
||
|
/**
|
||
|
* Compute the scaled value of `dimension` using the given scaling factor.
|
||
|
* This macro performs the integer equivalent of `ceil(dimension *
|
||
|
* scalingFactor)`.
|
||
|
*/
|
||
|
#define TJSCALED(dimension, scalingFactor) \
|
||
|
(((dimension) * scalingFactor.num + scalingFactor.denom - 1) / \
|
||
|
scalingFactor.denom)
|
||
|
|
||
|
|
||
|
#ifdef __cplusplus
|
||
|
extern "C" {
|
||
|
#endif
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Create a TurboJPEG compressor instance.
|
||
|
*
|
||
|
* @return a handle to the newly-created instance, or NULL if an error occurred
|
||
|
* (see #tjGetErrorStr2().)
|
||
|
*/
|
||
|
DLLEXPORT tjhandle tjInitCompress(void);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Compress a packed-pixel RGB, grayscale, or CMYK image into a JPEG image.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor or transformer instance
|
||
|
*
|
||
|
* @param srcBuf pointer to a buffer containing a packed-pixel RGB, grayscale,
|
||
|
* or CMYK source image to be compressed
|
||
|
*
|
||
|
* @param width width (in pixels) of the source image
|
||
|
*
|
||
|
* @param pitch bytes per row in the source image. Normally this should be
|
||
|
* <tt>width * #tjPixelSize[pixelFormat]</tt>, if the image is unpadded, or
|
||
|
* <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each row of the image
|
||
|
* is padded to the nearest multiple of 4 bytes, as is the case for Windows
|
||
|
* bitmaps. You can also be clever and use this parameter to skip rows, etc.
|
||
|
* Setting this parameter to 0 is the equivalent of setting it to
|
||
|
* <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
||
|
*
|
||
|
* @param height height (in pixels) of the source image
|
||
|
*
|
||
|
* @param pixelFormat pixel format of the source image (see @ref TJPF
|
||
|
* "Pixel formats".)
|
||
|
*
|
||
|
* @param jpegBuf address of a pointer to a byte buffer that will receive the
|
||
|
* JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to
|
||
|
* accommodate the size of the JPEG image. Thus, you can choose to:
|
||
|
* -# pre-allocate the JPEG buffer with an arbitrary size using #tjAlloc() and
|
||
|
* let TurboJPEG grow the buffer as needed,
|
||
|
* -# set `*jpegBuf` to NULL to tell TurboJPEG to allocate the buffer for you,
|
||
|
* or
|
||
|
* -# pre-allocate the buffer to a "worst case" size determined by calling
|
||
|
* #tjBufSize(). This should ensure that the buffer never has to be
|
||
|
* re-allocated. (Setting #TJFLAG_NOREALLOC guarantees that it won't be.)
|
||
|
* .
|
||
|
* If you choose option 1, then `*jpegSize` should be set to the size of your
|
||
|
* pre-allocated buffer. In any case, unless you have set #TJFLAG_NOREALLOC,
|
||
|
* you should always check `*jpegBuf` upon return from this function, as it may
|
||
|
* have changed.
|
||
|
*
|
||
|
* @param jpegSize pointer to an unsigned long variable that holds the size of
|
||
|
* the JPEG buffer. If `*jpegBuf` points to a pre-allocated buffer, then
|
||
|
* `*jpegSize` should be set to the size of the buffer. Upon return,
|
||
|
* `*jpegSize` will contain the size of the JPEG image (in bytes.) If
|
||
|
* `*jpegBuf` points to a JPEG buffer that is being reused from a previous call
|
||
|
* to one of the JPEG compression functions, then `*jpegSize` is ignored.
|
||
|
*
|
||
|
* @param jpegSubsamp the level of chrominance subsampling to be used when
|
||
|
* generating the JPEG image (see @ref TJSAMP
|
||
|
* "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @param jpegQual the image quality of the generated JPEG image (1 = worst,
|
||
|
* 100 = best)
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjCompress2(tjhandle handle, const unsigned char *srcBuf,
|
||
|
int width, int pitch, int height, int pixelFormat,
|
||
|
unsigned char **jpegBuf, unsigned long *jpegSize,
|
||
|
int jpegSubsamp, int jpegQual, int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Compress a unified planar YUV image into a JPEG image.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor or transformer instance
|
||
|
*
|
||
|
* @param srcBuf pointer to a buffer containing a unified planar YUV source
|
||
|
* image to be compressed. The size of this buffer should match the value
|
||
|
* returned by #tjBufSizeYUV2() for the given image width, height, row
|
||
|
* alignment, and level of chrominance subsampling. The Y, U (Cb), and V (Cr)
|
||
|
* image planes should be stored sequentially in the buffer. (Refer to
|
||
|
* @ref YUVnotes "YUV Image Format Notes".)
|
||
|
*
|
||
|
* @param width width (in pixels) of the source image. If the width is not an
|
||
|
* even multiple of the MCU block width (see #tjMCUWidth), then an intermediate
|
||
|
* buffer copy will be performed.
|
||
|
*
|
||
|
* @param align row alignment (in bytes) of the source image (must be a power
|
||
|
* of 2.) Setting this parameter to n indicates that each row in each plane of
|
||
|
* the source image is padded to the nearest multiple of n bytes
|
||
|
* (1 = unpadded.)
|
||
|
*
|
||
|
* @param height height (in pixels) of the source image. If the height is not
|
||
|
* an even multiple of the MCU block height (see #tjMCUHeight), then an
|
||
|
* intermediate buffer copy will be performed.
|
||
|
*
|
||
|
* @param subsamp the level of chrominance subsampling used in the source image
|
||
|
* (see @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @param jpegBuf address of a pointer to a byte buffer that will receive the
|
||
|
* JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to
|
||
|
* accommodate the size of the JPEG image. Thus, you can choose to:
|
||
|
* -# pre-allocate the JPEG buffer with an arbitrary size using #tjAlloc() and
|
||
|
* let TurboJPEG grow the buffer as needed,
|
||
|
* -# set `*jpegBuf` to NULL to tell TurboJPEG to allocate the buffer for you,
|
||
|
* or
|
||
|
* -# pre-allocate the buffer to a "worst case" size determined by calling
|
||
|
* #tjBufSize(). This should ensure that the buffer never has to be
|
||
|
* re-allocated. (Setting #TJFLAG_NOREALLOC guarantees that it won't be.)
|
||
|
* .
|
||
|
* If you choose option 1, then `*jpegSize` should be set to the size of your
|
||
|
* pre-allocated buffer. In any case, unless you have set #TJFLAG_NOREALLOC,
|
||
|
* you should always check `*jpegBuf` upon return from this function, as it may
|
||
|
* have changed.
|
||
|
*
|
||
|
* @param jpegSize pointer to an unsigned long variable that holds the size of
|
||
|
* the JPEG buffer. If `*jpegBuf` points to a pre-allocated buffer, then
|
||
|
* `*jpegSize` should be set to the size of the buffer. Upon return,
|
||
|
* `*jpegSize` will contain the size of the JPEG image (in bytes.) If
|
||
|
* `*jpegBuf` points to a JPEG buffer that is being reused from a previous call
|
||
|
* to one of the JPEG compression functions, then `*jpegSize` is ignored.
|
||
|
*
|
||
|
* @param jpegQual the image quality of the generated JPEG image (1 = worst,
|
||
|
* 100 = best)
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjCompressFromYUV(tjhandle handle, const unsigned char *srcBuf,
|
||
|
int width, int align, int height, int subsamp,
|
||
|
unsigned char **jpegBuf,
|
||
|
unsigned long *jpegSize, int jpegQual,
|
||
|
int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Compress a set of Y, U (Cb), and V (Cr) image planes into a JPEG image.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor or transformer instance
|
||
|
*
|
||
|
* @param srcPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes
|
||
|
* (or just a Y plane, if compressing a grayscale image) that contain a YUV
|
||
|
* source image to be compressed. These planes can be contiguous or
|
||
|
* non-contiguous in memory. The size of each plane should match the value
|
||
|
* returned by #tjPlaneSizeYUV() for the given image width, height, strides,
|
||
|
* and level of chrominance subsampling. Refer to @ref YUVnotes
|
||
|
* "YUV Image Format Notes" for more details.
|
||
|
*
|
||
|
* @param width width (in pixels) of the source image. If the width is not an
|
||
|
* even multiple of the MCU block width (see #tjMCUWidth), then an intermediate
|
||
|
* buffer copy will be performed.
|
||
|
*
|
||
|
* @param strides an array of integers, each specifying the number of bytes per
|
||
|
* row in the corresponding plane of the YUV source image. Setting the stride
|
||
|
* for any plane to 0 is the same as setting it to the plane width (see
|
||
|
* @ref YUVnotes "YUV Image Format Notes".) If `strides` is NULL, then the
|
||
|
* strides for all planes will be set to their respective plane widths. You
|
||
|
* can adjust the strides in order to specify an arbitrary amount of row
|
||
|
* padding in each plane or to create a JPEG image from a subregion of a larger
|
||
|
* planar YUV image.
|
||
|
*
|
||
|
* @param height height (in pixels) of the source image. If the height is not
|
||
|
* an even multiple of the MCU block height (see #tjMCUHeight), then an
|
||
|
* intermediate buffer copy will be performed.
|
||
|
*
|
||
|
* @param subsamp the level of chrominance subsampling used in the source image
|
||
|
* (see @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @param jpegBuf address of a pointer to a byte buffer that will receive the
|
||
|
* JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to
|
||
|
* accommodate the size of the JPEG image. Thus, you can choose to:
|
||
|
* -# pre-allocate the JPEG buffer with an arbitrary size using #tjAlloc() and
|
||
|
* let TurboJPEG grow the buffer as needed,
|
||
|
* -# set `*jpegBuf` to NULL to tell TurboJPEG to allocate the buffer for you,
|
||
|
* or
|
||
|
* -# pre-allocate the buffer to a "worst case" size determined by calling
|
||
|
* #tjBufSize(). This should ensure that the buffer never has to be
|
||
|
* re-allocated. (Setting #TJFLAG_NOREALLOC guarantees that it won't be.)
|
||
|
* .
|
||
|
* If you choose option 1, then `*jpegSize` should be set to the size of your
|
||
|
* pre-allocated buffer. In any case, unless you have set #TJFLAG_NOREALLOC,
|
||
|
* you should always check `*jpegBuf` upon return from this function, as it may
|
||
|
* have changed.
|
||
|
*
|
||
|
* @param jpegSize pointer to an unsigned long variable that holds the size of
|
||
|
* the JPEG buffer. If `*jpegBuf` points to a pre-allocated buffer, then
|
||
|
* `*jpegSize` should be set to the size of the buffer. Upon return,
|
||
|
* `*jpegSize` will contain the size of the JPEG image (in bytes.) If
|
||
|
* `*jpegBuf` points to a JPEG buffer that is being reused from a previous call
|
||
|
* to one of the JPEG compression functions, then `*jpegSize` is ignored.
|
||
|
*
|
||
|
* @param jpegQual the image quality of the generated JPEG image (1 = worst,
|
||
|
* 100 = best)
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjCompressFromYUVPlanes(tjhandle handle,
|
||
|
const unsigned char **srcPlanes,
|
||
|
int width, const int *strides,
|
||
|
int height, int subsamp,
|
||
|
unsigned char **jpegBuf,
|
||
|
unsigned long *jpegSize, int jpegQual,
|
||
|
int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The maximum size of the buffer (in bytes) required to hold a JPEG image with
|
||
|
* the given parameters. The number of bytes returned by this function is
|
||
|
* larger than the size of the uncompressed source image. The reason for this
|
||
|
* is that the JPEG format uses 16-bit coefficients, so it is possible for a
|
||
|
* very high-quality source image with very high-frequency content to expand
|
||
|
* rather than compress when converted to the JPEG format. Such images
|
||
|
* represent very rare corner cases, but since there is no way to predict the
|
||
|
* size of a JPEG image prior to compression, the corner cases have to be
|
||
|
* handled.
|
||
|
*
|
||
|
* @param width width (in pixels) of the image
|
||
|
*
|
||
|
* @param height height (in pixels) of the image
|
||
|
*
|
||
|
* @param jpegSubsamp the level of chrominance subsampling to be used when
|
||
|
* generating the JPEG image (see @ref TJSAMP
|
||
|
* "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @return the maximum size of the buffer (in bytes) required to hold the
|
||
|
* image, or -1 if the arguments are out of bounds.
|
||
|
*/
|
||
|
DLLEXPORT unsigned long tjBufSize(int width, int height, int jpegSubsamp);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The size of the buffer (in bytes) required to hold a unified planar YUV
|
||
|
* image with the given parameters.
|
||
|
*
|
||
|
* @param width width (in pixels) of the image
|
||
|
*
|
||
|
* @param align row alignment (in bytes) of the image (must be a power of 2.)
|
||
|
* Setting this parameter to n specifies that each row in each plane of the
|
||
|
* image will be padded to the nearest multiple of n bytes (1 = unpadded.)
|
||
|
*
|
||
|
* @param height height (in pixels) of the image
|
||
|
*
|
||
|
* @param subsamp level of chrominance subsampling in the image (see
|
||
|
* @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @return the size of the buffer (in bytes) required to hold the image, or -1
|
||
|
* if the arguments are out of bounds.
|
||
|
*/
|
||
|
DLLEXPORT unsigned long tjBufSizeYUV2(int width, int align, int height,
|
||
|
int subsamp);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The size of the buffer (in bytes) required to hold a YUV image plane with
|
||
|
* the given parameters.
|
||
|
*
|
||
|
* @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr)
|
||
|
*
|
||
|
* @param width width (in pixels) of the YUV image. NOTE: this is the width of
|
||
|
* the whole image, not the plane width.
|
||
|
*
|
||
|
* @param stride bytes per row in the image plane. Setting this to 0 is the
|
||
|
* equivalent of setting it to the plane width.
|
||
|
*
|
||
|
* @param height height (in pixels) of the YUV image. NOTE: this is the height
|
||
|
* of the whole image, not the plane height.
|
||
|
*
|
||
|
* @param subsamp level of chrominance subsampling in the image (see
|
||
|
* @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @return the size of the buffer (in bytes) required to hold the YUV image
|
||
|
* plane, or -1 if the arguments are out of bounds.
|
||
|
*/
|
||
|
DLLEXPORT unsigned long tjPlaneSizeYUV(int componentID, int width, int stride,
|
||
|
int height, int subsamp);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The plane width of a YUV image plane with the given parameters. Refer to
|
||
|
* @ref YUVnotes "YUV Image Format Notes" for a description of plane width.
|
||
|
*
|
||
|
* @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr)
|
||
|
*
|
||
|
* @param width width (in pixels) of the YUV image
|
||
|
*
|
||
|
* @param subsamp level of chrominance subsampling in the image (see
|
||
|
* @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @return the plane width of a YUV image plane with the given parameters, or
|
||
|
* -1 if the arguments are out of bounds.
|
||
|
*/
|
||
|
DLLEXPORT int tjPlaneWidth(int componentID, int width, int subsamp);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* The plane height of a YUV image plane with the given parameters. Refer to
|
||
|
* @ref YUVnotes "YUV Image Format Notes" for a description of plane height.
|
||
|
*
|
||
|
* @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr)
|
||
|
*
|
||
|
* @param height height (in pixels) of the YUV image
|
||
|
*
|
||
|
* @param subsamp level of chrominance subsampling in the image (see
|
||
|
* @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @return the plane height of a YUV image plane with the given parameters, or
|
||
|
* -1 if the arguments are out of bounds.
|
||
|
*/
|
||
|
DLLEXPORT int tjPlaneHeight(int componentID, int height, int subsamp);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Encode a packed-pixel RGB or grayscale image into a unified planar YUV
|
||
|
* image. This function performs color conversion (which is accelerated in the
|
||
|
* libjpeg-turbo implementation) but does not execute any of the other steps in
|
||
|
* the JPEG compression process.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor or transformer instance
|
||
|
*
|
||
|
* @param srcBuf pointer to a buffer containing a packed-pixel RGB or grayscale
|
||
|
* source image to be encoded
|
||
|
*
|
||
|
* @param width width (in pixels) of the source image
|
||
|
*
|
||
|
* @param pitch bytes per row in the source image. Normally this should be
|
||
|
* <tt>width * #tjPixelSize[pixelFormat]</tt>, if the image is unpadded, or
|
||
|
* <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each row of the image
|
||
|
* is padded to the nearest multiple of 4 bytes, as is the case for Windows
|
||
|
* bitmaps. You can also be clever and use this parameter to skip rows, etc.
|
||
|
* Setting this parameter to 0 is the equivalent of setting it to
|
||
|
* <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
||
|
*
|
||
|
* @param height height (in pixels) of the source image
|
||
|
*
|
||
|
* @param pixelFormat pixel format of the source image (see @ref TJPF
|
||
|
* "Pixel formats".)
|
||
|
*
|
||
|
* @param dstBuf pointer to a buffer that will receive the unified planar YUV
|
||
|
* image. Use #tjBufSizeYUV2() to determine the appropriate size for this
|
||
|
* buffer based on the image width, height, row alignment, and level of
|
||
|
* chrominance subsampling. The Y, U (Cb), and V (Cr) image planes will be
|
||
|
* stored sequentially in the buffer. (Refer to @ref YUVnotes
|
||
|
* "YUV Image Format Notes".)
|
||
|
*
|
||
|
* @param align row alignment (in bytes) of the YUV image (must be a power of
|
||
|
* 2.) Setting this parameter to n will cause each row in each plane of the
|
||
|
* YUV image to be padded to the nearest multiple of n bytes (1 = unpadded.)
|
||
|
* To generate images suitable for X Video, `align` should be set to 4.
|
||
|
*
|
||
|
* @param subsamp the level of chrominance subsampling to be used when
|
||
|
* generating the YUV image (see @ref TJSAMP
|
||
|
* "Chrominance subsampling options".) To generate images suitable for X
|
||
|
* Video, `subsamp` should be set to @ref TJSAMP_420. This produces an image
|
||
|
* compatible with the I420 (AKA "YUV420P") format.
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjEncodeYUV3(tjhandle handle, const unsigned char *srcBuf,
|
||
|
int width, int pitch, int height, int pixelFormat,
|
||
|
unsigned char *dstBuf, int align, int subsamp,
|
||
|
int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Encode a packed-pixel RGB or grayscale image into separate Y, U (Cb), and
|
||
|
* V (Cr) image planes. This function performs color conversion (which is
|
||
|
* accelerated in the libjpeg-turbo implementation) but does not execute any of
|
||
|
* the other steps in the JPEG compression process.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor or transformer instance
|
||
|
*
|
||
|
* @param srcBuf pointer to a buffer containing a packed-pixel RGB or grayscale
|
||
|
* source image to be encoded
|
||
|
*
|
||
|
* @param width width (in pixels) of the source image
|
||
|
*
|
||
|
* @param pitch bytes per row in the source image. Normally this should be
|
||
|
* <tt>width * #tjPixelSize[pixelFormat]</tt>, if the image is unpadded, or
|
||
|
* <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each row of the image
|
||
|
* is padded to the nearest multiple of 4 bytes, as is the case for Windows
|
||
|
* bitmaps. You can also be clever and use this parameter to skip rows, etc.
|
||
|
* Setting this parameter to 0 is the equivalent of setting it to
|
||
|
* <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
||
|
*
|
||
|
* @param height height (in pixels) of the source image
|
||
|
*
|
||
|
* @param pixelFormat pixel format of the source image (see @ref TJPF
|
||
|
* "Pixel formats".)
|
||
|
*
|
||
|
* @param dstPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes
|
||
|
* (or just a Y plane, if generating a grayscale image) that will receive the
|
||
|
* encoded image. These planes can be contiguous or non-contiguous in memory.
|
||
|
* Use #tjPlaneSizeYUV() to determine the appropriate size for each plane based
|
||
|
* on the image width, height, strides, and level of chrominance subsampling.
|
||
|
* Refer to @ref YUVnotes "YUV Image Format Notes" for more details.
|
||
|
*
|
||
|
* @param strides an array of integers, each specifying the number of bytes per
|
||
|
* row in the corresponding plane of the YUV image. Setting the stride for any
|
||
|
* plane to 0 is the same as setting it to the plane width (see @ref YUVnotes
|
||
|
* "YUV Image Format Notes".) If `strides` is NULL, then the strides for all
|
||
|
* planes will be set to their respective plane widths. You can adjust the
|
||
|
* strides in order to add an arbitrary amount of row padding to each plane or
|
||
|
* to encode an RGB or grayscale image into a subregion of a larger planar YUV
|
||
|
* image.
|
||
|
*
|
||
|
* @param subsamp the level of chrominance subsampling to be used when
|
||
|
* generating the YUV image (see @ref TJSAMP
|
||
|
* "Chrominance subsampling options".) To generate images suitable for X
|
||
|
* Video, `subsamp` should be set to @ref TJSAMP_420. This produces an image
|
||
|
* compatible with the I420 (AKA "YUV420P") format.
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjEncodeYUVPlanes(tjhandle handle, const unsigned char *srcBuf,
|
||
|
int width, int pitch, int height,
|
||
|
int pixelFormat, unsigned char **dstPlanes,
|
||
|
int *strides, int subsamp, int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Create a TurboJPEG decompressor instance.
|
||
|
*
|
||
|
* @return a handle to the newly-created instance, or NULL if an error occurred
|
||
|
* (see #tjGetErrorStr2().)
|
||
|
*/
|
||
|
DLLEXPORT tjhandle tjInitDecompress(void);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Retrieve information about a JPEG image without decompressing it, or prime
|
||
|
* the decompressor with quantization and Huffman tables.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
||
|
*
|
||
|
* @param jpegBuf pointer to a byte buffer containing a JPEG image or an
|
||
|
* "abbreviated table specification" (AKA "tables-only") datastream. Passing a
|
||
|
* tables-only datastream to this function primes the decompressor with
|
||
|
* quantization and Huffman tables that can be used when decompressing
|
||
|
* subsequent "abbreviated image" datastreams. This is useful, for instance,
|
||
|
* when decompressing video streams in which all frames share the same
|
||
|
* quantization and Huffman tables.
|
||
|
*
|
||
|
* @param jpegSize size of the JPEG image or tables-only datastream (in bytes)
|
||
|
*
|
||
|
* @param width pointer to an integer variable that will receive the width (in
|
||
|
* pixels) of the JPEG image. If `jpegBuf` points to a tables-only datastream,
|
||
|
* then `width` is ignored.
|
||
|
*
|
||
|
* @param height pointer to an integer variable that will receive the height
|
||
|
* (in pixels) of the JPEG image. If `jpegBuf` points to a tables-only
|
||
|
* datastream, then `height` is ignored.
|
||
|
*
|
||
|
* @param jpegSubsamp pointer to an integer variable that will receive the
|
||
|
* level of chrominance subsampling used when the JPEG image was compressed
|
||
|
* (see @ref TJSAMP "Chrominance subsampling options".) If `jpegBuf` points to
|
||
|
* a tables-only datastream, then `jpegSubsamp` is ignored.
|
||
|
*
|
||
|
* @param jpegColorspace pointer to an integer variable that will receive one
|
||
|
* of the JPEG colorspace constants, indicating the colorspace of the JPEG
|
||
|
* image (see @ref TJCS "JPEG colorspaces".) If `jpegBuf` points to a
|
||
|
* tables-only datastream, then `jpegColorspace` is ignored.
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjDecompressHeader3(tjhandle handle,
|
||
|
const unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, int *width,
|
||
|
int *height, int *jpegSubsamp,
|
||
|
int *jpegColorspace);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Returns a list of fractional scaling factors that the JPEG decompressor
|
||
|
* supports.
|
||
|
*
|
||
|
* @param numScalingFactors pointer to an integer variable that will receive
|
||
|
* the number of elements in the list
|
||
|
*
|
||
|
* @return a pointer to a list of fractional scaling factors, or NULL if an
|
||
|
* error is encountered (see #tjGetErrorStr2().)
|
||
|
*/
|
||
|
DLLEXPORT tjscalingfactor *tjGetScalingFactors(int *numScalingFactors);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Decompress a JPEG image into a packed-pixel RGB, grayscale, or CMYK image.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
||
|
*
|
||
|
* @param jpegBuf pointer to a byte buffer containing the JPEG image to
|
||
|
* decompress
|
||
|
*
|
||
|
* @param jpegSize size of the JPEG image (in bytes)
|
||
|
*
|
||
|
* @param dstBuf pointer to a buffer that will receive the packed-pixel
|
||
|
* decompressed image. This buffer should normally be `pitch * scaledHeight`
|
||
|
* bytes in size, where `scaledHeight` can be determined by calling #TJSCALED()
|
||
|
* with the JPEG image height and one of the scaling factors returned by
|
||
|
* #tjGetScalingFactors(). The `dstBuf` pointer may also be used to decompress
|
||
|
* into a specific region of a larger buffer.
|
||
|
*
|
||
|
* @param width desired width (in pixels) of the destination image. If this is
|
||
|
* different than the width of the JPEG image being decompressed, then
|
||
|
* TurboJPEG will use scaling in the JPEG decompressor to generate the largest
|
||
|
* possible image that will fit within the desired width. If `width` is set to
|
||
|
* 0, then only the height will be considered when determining the scaled image
|
||
|
* size.
|
||
|
*
|
||
|
* @param pitch bytes per row in the destination image. Normally this should
|
||
|
* be set to <tt>scaledWidth * #tjPixelSize[pixelFormat]</tt>, if the
|
||
|
* destination image should be unpadded, or
|
||
|
* <tt>#TJPAD(scaledWidth * #tjPixelSize[pixelFormat])</tt> if each row of the
|
||
|
* destination image should be padded to the nearest multiple of 4 bytes, as is
|
||
|
* the case for Windows bitmaps. (NOTE: `scaledWidth` can be determined by
|
||
|
* calling #TJSCALED() with the JPEG image width and one of the scaling factors
|
||
|
* returned by #tjGetScalingFactors().) You can also be clever and use the
|
||
|
* pitch parameter to skip rows, etc. Setting this parameter to 0 is the
|
||
|
* equivalent of setting it to
|
||
|
* <tt>scaledWidth * #tjPixelSize[pixelFormat]</tt>.
|
||
|
*
|
||
|
* @param height desired height (in pixels) of the destination image. If this
|
||
|
* is different than the height of the JPEG image being decompressed, then
|
||
|
* TurboJPEG will use scaling in the JPEG decompressor to generate the largest
|
||
|
* possible image that will fit within the desired height. If `height` is set
|
||
|
* to 0, then only the width will be considered when determining the scaled
|
||
|
* image size.
|
||
|
*
|
||
|
* @param pixelFormat pixel format of the destination image (see @ref
|
||
|
* TJPF "Pixel formats".)
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjDecompress2(tjhandle handle, const unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, unsigned char *dstBuf,
|
||
|
int width, int pitch, int height, int pixelFormat,
|
||
|
int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Decompress a JPEG image into a unified planar YUV image. This function
|
||
|
* performs JPEG decompression but leaves out the color conversion step, so a
|
||
|
* planar YUV image is generated instead of a packed-pixel image.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
||
|
*
|
||
|
* @param jpegBuf pointer to a byte buffer containing the JPEG image to
|
||
|
* decompress
|
||
|
*
|
||
|
* @param jpegSize size of the JPEG image (in bytes)
|
||
|
*
|
||
|
* @param dstBuf pointer to a buffer that will receive the unified planar YUV
|
||
|
* decompressed image. Use #tjBufSizeYUV2() to determine the appropriate size
|
||
|
* for this buffer based on the scaled image width, scaled image height, row
|
||
|
* alignment, and level of chrominance subsampling. The Y, U (Cb), and V (Cr)
|
||
|
* image planes will be stored sequentially in the buffer. (Refer to
|
||
|
* @ref YUVnotes "YUV Image Format Notes".)
|
||
|
*
|
||
|
* @param width desired width (in pixels) of the YUV image. If this is
|
||
|
* different than the width of the JPEG image being decompressed, then
|
||
|
* TurboJPEG will use scaling in the JPEG decompressor to generate the largest
|
||
|
* possible image that will fit within the desired width. If `width` is set to
|
||
|
* 0, then only the height will be considered when determining the scaled image
|
||
|
* size. If the scaled width is not an even multiple of the MCU block width
|
||
|
* (see #tjMCUWidth), then an intermediate buffer copy will be performed.
|
||
|
*
|
||
|
* @param align row alignment (in bytes) of the YUV image (must be a power of
|
||
|
* 2.) Setting this parameter to n will cause each row in each plane of the
|
||
|
* YUV image to be padded to the nearest multiple of n bytes (1 = unpadded.)
|
||
|
* To generate images suitable for X Video, `align` should be set to 4.
|
||
|
*
|
||
|
* @param height desired height (in pixels) of the YUV image. If this is
|
||
|
* different than the height of the JPEG image being decompressed, then
|
||
|
* TurboJPEG will use scaling in the JPEG decompressor to generate the largest
|
||
|
* possible image that will fit within the desired height. If `height` is set
|
||
|
* to 0, then only the width will be considered when determining the scaled
|
||
|
* image size. If the scaled height is not an even multiple of the MCU block
|
||
|
* height (see #tjMCUHeight), then an intermediate buffer copy will be
|
||
|
* performed.
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjDecompressToYUV2(tjhandle handle, const unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, unsigned char *dstBuf,
|
||
|
int width, int align, int height, int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Decompress a JPEG image into separate Y, U (Cb), and V (Cr) image
|
||
|
* planes. This function performs JPEG decompression but leaves out the color
|
||
|
* conversion step, so a planar YUV image is generated instead of a
|
||
|
* packed-pixel image.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
||
|
*
|
||
|
* @param jpegBuf pointer to a byte buffer containing the JPEG image to
|
||
|
* decompress
|
||
|
*
|
||
|
* @param jpegSize size of the JPEG image (in bytes)
|
||
|
*
|
||
|
* @param dstPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes
|
||
|
* (or just a Y plane, if decompressing a grayscale image) that will receive
|
||
|
* the decompressed image. These planes can be contiguous or non-contiguous in
|
||
|
* memory. Use #tjPlaneSizeYUV() to determine the appropriate size for each
|
||
|
* plane based on the scaled image width, scaled image height, strides, and
|
||
|
* level of chrominance subsampling. Refer to @ref YUVnotes
|
||
|
* "YUV Image Format Notes" for more details.
|
||
|
*
|
||
|
* @param width desired width (in pixels) of the YUV image. If this is
|
||
|
* different than the width of the JPEG image being decompressed, then
|
||
|
* TurboJPEG will use scaling in the JPEG decompressor to generate the largest
|
||
|
* possible image that will fit within the desired width. If `width` is set to
|
||
|
* 0, then only the height will be considered when determining the scaled image
|
||
|
* size. If the scaled width is not an even multiple of the MCU block width
|
||
|
* (see #tjMCUWidth), then an intermediate buffer copy will be performed.
|
||
|
*
|
||
|
* @param strides an array of integers, each specifying the number of bytes per
|
||
|
* row in the corresponding plane of the YUV image. Setting the stride for any
|
||
|
* plane to 0 is the same as setting it to the scaled plane width (see
|
||
|
* @ref YUVnotes "YUV Image Format Notes".) If `strides` is NULL, then the
|
||
|
* strides for all planes will be set to their respective scaled plane widths.
|
||
|
* You can adjust the strides in order to add an arbitrary amount of row
|
||
|
* padding to each plane or to decompress the JPEG image into a subregion of a
|
||
|
* larger planar YUV image.
|
||
|
*
|
||
|
* @param height desired height (in pixels) of the YUV image. If this is
|
||
|
* different than the height of the JPEG image being decompressed, then
|
||
|
* TurboJPEG will use scaling in the JPEG decompressor to generate the largest
|
||
|
* possible image that will fit within the desired height. If `height` is set
|
||
|
* to 0, then only the width will be considered when determining the scaled
|
||
|
* image size. If the scaled height is not an even multiple of the MCU block
|
||
|
* height (see #tjMCUHeight), then an intermediate buffer copy will be
|
||
|
* performed.
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjDecompressToYUVPlanes(tjhandle handle,
|
||
|
const unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize,
|
||
|
unsigned char **dstPlanes, int width,
|
||
|
int *strides, int height, int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Decode a unified planar YUV image into a packed-pixel RGB or grayscale
|
||
|
* image. This function performs color conversion (which is accelerated in the
|
||
|
* libjpeg-turbo implementation) but does not execute any of the other steps in
|
||
|
* the JPEG decompression process.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
||
|
*
|
||
|
* @param srcBuf pointer to a buffer containing a unified planar YUV source
|
||
|
* image to be decoded. The size of this buffer should match the value
|
||
|
* returned by #tjBufSizeYUV2() for the given image width, height, row
|
||
|
* alignment, and level of chrominance subsampling. The Y, U (Cb), and V (Cr)
|
||
|
* image planes should be stored sequentially in the source buffer. (Refer to
|
||
|
* @ref YUVnotes "YUV Image Format Notes".)
|
||
|
*
|
||
|
* @param align row alignment (in bytes) of the YUV source image (must be a
|
||
|
* power of 2.) Setting this parameter to n indicates that each row in each
|
||
|
* plane of the YUV source image is padded to the nearest multiple of n bytes
|
||
|
* (1 = unpadded.)
|
||
|
*
|
||
|
* @param subsamp the level of chrominance subsampling used in the YUV source
|
||
|
* image (see @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @param dstBuf pointer to a buffer that will receive the packed-pixel decoded
|
||
|
* image. This buffer should normally be `pitch * height` bytes in size, but
|
||
|
* the `dstBuf` pointer can also be used to decode into a specific region of a
|
||
|
* larger buffer.
|
||
|
*
|
||
|
* @param width width (in pixels) of the source and destination images
|
||
|
*
|
||
|
* @param pitch bytes per row in the destination image. Normally this should
|
||
|
* be set to <tt>width * #tjPixelSize[pixelFormat]</tt>, if the destination
|
||
|
* image should be unpadded, or
|
||
|
* <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each row of the
|
||
|
* destination image should be padded to the nearest multiple of 4 bytes, as is
|
||
|
* the case for Windows bitmaps. You can also be clever and use the pitch
|
||
|
* parameter to skip rows, etc. Setting this parameter to 0 is the equivalent
|
||
|
* of setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
||
|
*
|
||
|
* @param height height (in pixels) of the source and destination images
|
||
|
*
|
||
|
* @param pixelFormat pixel format of the destination image (see @ref TJPF
|
||
|
* "Pixel formats".)
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjDecodeYUV(tjhandle handle, const unsigned char *srcBuf,
|
||
|
int align, int subsamp, unsigned char *dstBuf,
|
||
|
int width, int pitch, int height, int pixelFormat,
|
||
|
int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Decode a set of Y, U (Cb), and V (Cr) image planes into a packed-pixel RGB
|
||
|
* or grayscale image. This function performs color conversion (which is
|
||
|
* accelerated in the libjpeg-turbo implementation) but does not execute any of
|
||
|
* the other steps in the JPEG decompression process.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
||
|
*
|
||
|
* @param srcPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes
|
||
|
* (or just a Y plane, if decoding a grayscale image) that contain a YUV image
|
||
|
* to be decoded. These planes can be contiguous or non-contiguous in memory.
|
||
|
* The size of each plane should match the value returned by #tjPlaneSizeYUV()
|
||
|
* for the given image width, height, strides, and level of chrominance
|
||
|
* subsampling. Refer to @ref YUVnotes "YUV Image Format Notes" for more
|
||
|
* details.
|
||
|
*
|
||
|
* @param strides an array of integers, each specifying the number of bytes per
|
||
|
* row in the corresponding plane of the YUV source image. Setting the stride
|
||
|
* for any plane to 0 is the same as setting it to the plane width (see
|
||
|
* @ref YUVnotes "YUV Image Format Notes".) If `strides` is NULL, then the
|
||
|
* strides for all planes will be set to their respective plane widths. You
|
||
|
* can adjust the strides in order to specify an arbitrary amount of row
|
||
|
* padding in each plane or to decode a subregion of a larger planar YUV image.
|
||
|
*
|
||
|
* @param subsamp the level of chrominance subsampling used in the YUV source
|
||
|
* image (see @ref TJSAMP "Chrominance subsampling options".)
|
||
|
*
|
||
|
* @param dstBuf pointer to a buffer that will receive the packed-pixel decoded
|
||
|
* image. This buffer should normally be `pitch * height` bytes in size, but
|
||
|
* the `dstBuf` pointer can also be used to decode into a specific region of a
|
||
|
* larger buffer.
|
||
|
*
|
||
|
* @param width width (in pixels) of the source and destination images
|
||
|
*
|
||
|
* @param pitch bytes per row in the destination image. Normally this should
|
||
|
* be set to <tt>width * #tjPixelSize[pixelFormat]</tt>, if the destination
|
||
|
* image should be unpadded, or
|
||
|
* <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each row of the
|
||
|
* destination image should be padded to the nearest multiple of 4 bytes, as is
|
||
|
* the case for Windows bitmaps. You can also be clever and use the pitch
|
||
|
* parameter to skip rows, etc. Setting this parameter to 0 is the equivalent
|
||
|
* of setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
||
|
*
|
||
|
* @param height height (in pixels) of the source and destination images
|
||
|
*
|
||
|
* @param pixelFormat pixel format of the destination image (see @ref TJPF
|
||
|
* "Pixel formats".)
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjDecodeYUVPlanes(tjhandle handle,
|
||
|
const unsigned char **srcPlanes,
|
||
|
const int *strides, int subsamp,
|
||
|
unsigned char *dstBuf, int width, int pitch,
|
||
|
int height, int pixelFormat, int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Create a new TurboJPEG transformer instance.
|
||
|
*
|
||
|
* @return a handle to the newly-created instance, or NULL if an error
|
||
|
* occurred (see #tjGetErrorStr2().)
|
||
|
*/
|
||
|
DLLEXPORT tjhandle tjInitTransform(void);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Losslessly transform a JPEG image into another JPEG image. Lossless
|
||
|
* transforms work by moving the raw DCT coefficients from one JPEG image
|
||
|
* structure to another without altering the values of the coefficients. While
|
||
|
* this is typically faster than decompressing the image, transforming it, and
|
||
|
* re-compressing it, lossless transforms are not free. Each lossless
|
||
|
* transform requires reading and performing Huffman decoding on all of the
|
||
|
* coefficients in the source image, regardless of the size of the destination
|
||
|
* image. Thus, this function provides a means of generating multiple
|
||
|
* transformed images from the same source or applying multiple transformations
|
||
|
* simultaneously, in order to eliminate the need to read the source
|
||
|
* coefficients multiple times.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG transformer instance
|
||
|
*
|
||
|
* @param jpegBuf pointer to a byte buffer containing the JPEG source image to
|
||
|
* transform
|
||
|
*
|
||
|
* @param jpegSize size of the JPEG source image (in bytes)
|
||
|
*
|
||
|
* @param n the number of transformed JPEG images to generate
|
||
|
*
|
||
|
* @param dstBufs pointer to an array of n byte buffers. `dstBufs[i]` will
|
||
|
* receive a JPEG image that has been transformed using the parameters in
|
||
|
* `transforms[i]`. TurboJPEG has the ability to reallocate the JPEG
|
||
|
* destination buffer to accommodate the size of the transformed JPEG image.
|
||
|
* Thus, you can choose to:
|
||
|
* -# pre-allocate the JPEG destination buffer with an arbitrary size using
|
||
|
* #tjAlloc() and let TurboJPEG grow the buffer as needed,
|
||
|
* -# set `dstBufs[i]` to NULL to tell TurboJPEG to allocate the buffer for
|
||
|
* you, or
|
||
|
* -# pre-allocate the buffer to a "worst case" size determined by calling
|
||
|
* #tjBufSize() with the transformed or cropped width and height. Under normal
|
||
|
* circumstances, this should ensure that the buffer never has to be
|
||
|
* re-allocated. (Setting #TJFLAG_NOREALLOC guarantees that it won't be.)
|
||
|
* Note, however, that there are some rare cases (such as transforming images
|
||
|
* with a large amount of embedded EXIF or ICC profile data) in which the
|
||
|
* transformed JPEG image will be larger than the worst-case size, and
|
||
|
* #TJFLAG_NOREALLOC cannot be used in those cases.
|
||
|
* .
|
||
|
* If you choose option 1, then `dstSizes[i]` should be set to the size of your
|
||
|
* pre-allocated buffer. In any case, unless you have set #TJFLAG_NOREALLOC,
|
||
|
* you should always check `dstBufs[i]` upon return from this function, as it
|
||
|
* may have changed.
|
||
|
*
|
||
|
* @param dstSizes pointer to an array of n unsigned long variables that will
|
||
|
* receive the actual sizes (in bytes) of each transformed JPEG image. If
|
||
|
* `dstBufs[i]` points to a pre-allocated buffer, then `dstSizes[i]` should be
|
||
|
* set to the size of the buffer. Upon return, `dstSizes[i]` will contain the
|
||
|
* size of the transformed JPEG image (in bytes.)
|
||
|
*
|
||
|
* @param transforms pointer to an array of n #tjtransform structures, each of
|
||
|
* which specifies the transform parameters and/or cropping region for the
|
||
|
* corresponding transformed JPEG image.
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT
|
||
|
* "flags"
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2()
|
||
|
* and #tjGetErrorCode().)
|
||
|
*/
|
||
|
DLLEXPORT int tjTransform(tjhandle handle, const unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, int n,
|
||
|
unsigned char **dstBufs, unsigned long *dstSizes,
|
||
|
tjtransform *transforms, int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Destroy a TurboJPEG compressor, decompressor, or transformer instance.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor, decompressor or
|
||
|
* transformer instance
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2().)
|
||
|
*/
|
||
|
DLLEXPORT int tjDestroy(tjhandle handle);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Allocate a byte buffer for use with TurboJPEG. You should always use this
|
||
|
* function to allocate the JPEG destination buffer(s) for the compression and
|
||
|
* transform functions unless you are disabling automatic buffer (re)allocation
|
||
|
* (by setting #TJFLAG_NOREALLOC.)
|
||
|
*
|
||
|
* @param bytes the number of bytes to allocate
|
||
|
*
|
||
|
* @return a pointer to a newly-allocated buffer with the specified number of
|
||
|
* bytes.
|
||
|
*
|
||
|
* @sa tjFree()
|
||
|
*/
|
||
|
DLLEXPORT unsigned char *tjAlloc(int bytes);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Load a packed-pixel image from disk into memory.
|
||
|
*
|
||
|
* @param filename name of a file containing a packed-pixel image in Windows
|
||
|
* BMP or PBMPLUS (PPM/PGM) format
|
||
|
*
|
||
|
* @param width pointer to an integer variable that will receive the width (in
|
||
|
* pixels) of the packed-pixel image
|
||
|
*
|
||
|
* @param align row alignment of the packed-pixel buffer to be returned (must
|
||
|
* be a power of 2.) Setting this parameter to n will cause all rows in the
|
||
|
* buffer to be padded to the nearest multiple of n bytes (1 = unpadded.)
|
||
|
*
|
||
|
* @param height pointer to an integer variable that will receive the height
|
||
|
* (in pixels) of the packed-pixel image
|
||
|
*
|
||
|
* @param pixelFormat pointer to an integer variable that specifies or will
|
||
|
* receive the pixel format of the packed-pixel buffer. The behavior of
|
||
|
* #tjLoadImage() will vary depending on the value of `*pixelFormat` passed to
|
||
|
* the function:
|
||
|
* - @ref TJPF_UNKNOWN : The packed-pixel buffer returned by this function will
|
||
|
* use the most optimal pixel format for the file type, and `*pixelFormat` will
|
||
|
* contain the ID of that pixel format upon successful return from this
|
||
|
* function.
|
||
|
* - @ref TJPF_GRAY : Only PGM files and 8-bit-per-pixel BMP files with a
|
||
|
* grayscale colormap can be loaded.
|
||
|
* - @ref TJPF_CMYK : The RGB or grayscale pixels stored in the file will be
|
||
|
* converted using a quick & dirty algorithm that is suitable only for testing
|
||
|
* purposes. (Proper conversion between CMYK and other formats requires a
|
||
|
* color management system.)
|
||
|
* - Other @ref TJPF "pixel formats" : The packed-pixel buffer will use the
|
||
|
* specified pixel format, and pixel format conversion will be performed if
|
||
|
* necessary.
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP
|
||
|
* "flags".
|
||
|
*
|
||
|
* @return a pointer to a newly-allocated buffer containing the packed-pixel
|
||
|
* image, converted to the chosen pixel format and with the chosen row
|
||
|
* alignment, or NULL if an error occurred (see #tjGetErrorStr2().) This
|
||
|
* buffer should be freed using #tjFree().
|
||
|
*/
|
||
|
DLLEXPORT unsigned char *tjLoadImage(const char *filename, int *width,
|
||
|
int align, int *height, int *pixelFormat,
|
||
|
int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Save a packed-pixel image from memory to disk.
|
||
|
*
|
||
|
* @param filename name of a file to which to save the packed-pixel image. The
|
||
|
* image will be stored in Windows BMP or PBMPLUS (PPM/PGM) format, depending
|
||
|
* on the file extension.
|
||
|
*
|
||
|
* @param buffer pointer to a buffer containing a packed-pixel RGB, grayscale,
|
||
|
* or CMYK image to be saved
|
||
|
*
|
||
|
* @param width width (in pixels) of the packed-pixel image
|
||
|
*
|
||
|
* @param pitch bytes per row in the packed-pixel image. Setting this
|
||
|
* parameter to 0 is the equivalent of setting it to
|
||
|
* <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
||
|
*
|
||
|
* @param height height (in pixels) of the packed-pixel image
|
||
|
*
|
||
|
* @param pixelFormat pixel format of the packed-pixel image (see @ref TJPF
|
||
|
* "Pixel formats".) If this parameter is set to @ref TJPF_GRAY, then the
|
||
|
* image will be stored in PGM or 8-bit-per-pixel (indexed color) BMP format.
|
||
|
* Otherwise, the image will be stored in PPM or 24-bit-per-pixel BMP format.
|
||
|
* If this parameter is set to @ref TJPF_CMYK, then the CMYK pixels will be
|
||
|
* converted to RGB using a quick & dirty algorithm that is suitable only for
|
||
|
* testing purposes. (Proper conversion between CMYK and other formats
|
||
|
* requires a color management system.)
|
||
|
*
|
||
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP
|
||
|
* "flags".
|
||
|
*
|
||
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2().)
|
||
|
*/
|
||
|
DLLEXPORT int tjSaveImage(const char *filename, unsigned char *buffer,
|
||
|
int width, int pitch, int height, int pixelFormat,
|
||
|
int flags);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Free a byte buffer previously allocated by TurboJPEG. You should always use
|
||
|
* this function to free JPEG destination buffer(s) that were automatically
|
||
|
* (re)allocated by the compression and transform functions or that were
|
||
|
* manually allocated using #tjAlloc().
|
||
|
*
|
||
|
* @param buffer address of the buffer to free. If the address is NULL, then
|
||
|
* this function has no effect.
|
||
|
*
|
||
|
* @sa tjAlloc()
|
||
|
*/
|
||
|
DLLEXPORT void tjFree(unsigned char *buffer);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Returns a descriptive error message explaining why the last command failed.
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor, decompressor, or
|
||
|
* transformer instance, or NULL if the error was generated by a global
|
||
|
* function (but note that retrieving the error message for a global function
|
||
|
* is thread-safe only on platforms that support thread-local storage.)
|
||
|
*
|
||
|
* @return a descriptive error message explaining why the last command failed.
|
||
|
*/
|
||
|
DLLEXPORT char *tjGetErrorStr2(tjhandle handle);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Returns a code indicating the severity of the last error. See
|
||
|
* @ref TJERR "Error codes".
|
||
|
*
|
||
|
* @param handle a handle to a TurboJPEG compressor, decompressor or
|
||
|
* transformer instance
|
||
|
*
|
||
|
* @return a code indicating the severity of the last error. See
|
||
|
* @ref TJERR "Error codes".
|
||
|
*/
|
||
|
DLLEXPORT int tjGetErrorCode(tjhandle handle);
|
||
|
|
||
|
|
||
|
/* Backward compatibility functions and macros (nothing to see here) */
|
||
|
|
||
|
/* TurboJPEG 1.0+ */
|
||
|
|
||
|
#define NUMSUBOPT TJ_NUMSAMP
|
||
|
#define TJ_444 TJSAMP_444
|
||
|
#define TJ_422 TJSAMP_422
|
||
|
#define TJ_420 TJSAMP_420
|
||
|
#define TJ_411 TJSAMP_420
|
||
|
#define TJ_GRAYSCALE TJSAMP_GRAY
|
||
|
|
||
|
#define TJ_BGR 1
|
||
|
#define TJ_BOTTOMUP TJFLAG_BOTTOMUP
|
||
|
#define TJ_FORCEMMX TJFLAG_FORCEMMX
|
||
|
#define TJ_FORCESSE TJFLAG_FORCESSE
|
||
|
#define TJ_FORCESSE2 TJFLAG_FORCESSE2
|
||
|
#define TJ_ALPHAFIRST 64
|
||
|
#define TJ_FORCESSE3 TJFLAG_FORCESSE3
|
||
|
#define TJ_FASTUPSAMPLE TJFLAG_FASTUPSAMPLE
|
||
|
|
||
|
DLLEXPORT unsigned long TJBUFSIZE(int width, int height);
|
||
|
|
||
|
DLLEXPORT int tjCompress(tjhandle handle, unsigned char *srcBuf, int width,
|
||
|
int pitch, int height, int pixelSize,
|
||
|
unsigned char *dstBuf, unsigned long *compressedSize,
|
||
|
int jpegSubsamp, int jpegQual, int flags);
|
||
|
|
||
|
DLLEXPORT int tjDecompress(tjhandle handle, unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, unsigned char *dstBuf,
|
||
|
int width, int pitch, int height, int pixelSize,
|
||
|
int flags);
|
||
|
|
||
|
DLLEXPORT int tjDecompressHeader(tjhandle handle, unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, int *width,
|
||
|
int *height);
|
||
|
|
||
|
DLLEXPORT char *tjGetErrorStr(void);
|
||
|
|
||
|
/* TurboJPEG 1.1+ */
|
||
|
|
||
|
#define TJ_YUV 512
|
||
|
|
||
|
DLLEXPORT unsigned long TJBUFSIZEYUV(int width, int height, int jpegSubsamp);
|
||
|
|
||
|
DLLEXPORT int tjDecompressHeader2(tjhandle handle, unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, int *width,
|
||
|
int *height, int *jpegSubsamp);
|
||
|
|
||
|
DLLEXPORT int tjDecompressToYUV(tjhandle handle, unsigned char *jpegBuf,
|
||
|
unsigned long jpegSize, unsigned char *dstBuf,
|
||
|
int flags);
|
||
|
|
||
|
DLLEXPORT int tjEncodeYUV(tjhandle handle, unsigned char *srcBuf, int width,
|
||
|
int pitch, int height, int pixelSize,
|
||
|
unsigned char *dstBuf, int subsamp, int flags);
|
||
|
|
||
|
/* TurboJPEG 1.2+ */
|
||
|
|
||
|
#define TJFLAG_FORCEMMX 8
|
||
|
#define TJFLAG_FORCESSE 16
|
||
|
#define TJFLAG_FORCESSE2 32
|
||
|
#define TJFLAG_FORCESSE3 128
|
||
|
|
||
|
DLLEXPORT unsigned long tjBufSizeYUV(int width, int height, int subsamp);
|
||
|
|
||
|
DLLEXPORT int tjEncodeYUV2(tjhandle handle, unsigned char *srcBuf, int width,
|
||
|
int pitch, int height, int pixelFormat,
|
||
|
unsigned char *dstBuf, int subsamp, int flags);
|
||
|
|
||
|
/**
|
||
|
* @}
|
||
|
*/
|
||
|
|
||
|
#ifdef __cplusplus
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
#endif
|