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[libpng16] Removed non-working ICC profile support code. There was too much

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code for too little gain; implementing full ICC color correction is maybe
desireable but is left up to applications.
This commit is contained in:
John Bowler
2012-11-01 08:12:47 -05:00
committed by Glenn Randers-Pehrson
parent 7f912dbeb5
commit 520803d57e
12 changed files with 44 additions and 1382 deletions
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81
pngstruct.h
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@@ -119,7 +119,6 @@ typedef struct png_colorspace
#ifdef PNG_COLORSPACE_SUPPORTED
png_xy end_points_xy; /* End points as chromaticities */
png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */
png_uint_32 icc_info; /* Record of information from the colorspace */
png_uint_16 rendering_intent; /* Rendering intent of a profile */
#endif
@@ -129,74 +128,6 @@ typedef struct png_colorspace
typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
/* ICC specific flags for the 'icc_info' field. */
/* The first four bits are for information defined from the profile, the
* remainder of the bits indicate the presence of specific tags. The #define
* names are derived from the tag name in the ICC 2010 (v4) specification.
*/
# define PNG_ICC_PCSXYZ 0x00000001U /* PCSXYS, else PCSLAB */
# define PNG_ICC_RGB 0x00000002U /* 'RGB ', else 'GRAY ' */
/* 0x00000004U reserved */
/* 0x00000008U reserved */
/* A utility to return the number of channels on the A side of the transform
* given an info value (can be optimized).
*/
# define PNG_ICC_CHANNELS(info) ((((info)&PNG_ICC_RGB)?2U:0U)+1U)
/* The profile description and copyright must be present in all valid ICC
* profiles, however libpng does not use them so absence is just reported as
* a warning. The media white point should be present too, but if it isn't
* all we lose is the ability to know if it differs from the adopted white
* (i.e. the information that the device maxima are actually colored;
* a non-white substrate for a printer, or an uncorrected scan for example.)
* The chromaticAdaptationTag tells us that the adopted white of the original
* differs from the PCS adopted white (which is identical to the PCS
* illuminant and should always be D50).
*/
# define PNG_ICC_profileDescriptionTag 0x00000010U /* required */
# define PNG_ICC_copyrightTag 0x00000020U /* required */
# define PNG_ICC_mediaWhitePointTag 0x00000040U /* required */
# define PNG_ICC_chromaticAdaptationTag 0x00000080U /* optional */
/* Tags that are required in all profiles (except DeviceLink): */
# define PNG_ICC_REQUIRED_BASE 0x00000070U
/* Other tags have to appear in specific profiles. In general a profile must
* either contain appropriate TRC and (for RGB profiles) matrix tags *or* it
* must contain AToB0 and BToA0 - the CLUT based transforms to an absolute
* colorimetric PCS. In the TRC case the PCS encoding must be PCSXYZ.
*/
# define PNG_ICC_redMatrixColumnTag 0x00000100U
# define PNG_ICC_greenMatrixColumnTag 0x00000200U
# define PNG_ICC_blueMatrixColumnTag 0x00000400U
/* 0x00000800U reserved */
# define PNG_ICC_redTRCTag 0x00001000U
# define PNG_ICC_greenTRCTag 0x00002000U
# define PNG_ICC_blueTRCTag 0x00004000U
# define PNG_ICC_grayTRCTag 0x00008000U
# define PNG_ICC_REQUIRED_RGB_MATRIXTRC 0x00007700U /* Required for RGB TRC */
# define PNG_ICC_ALL_TRC 0x0000f000U /* Includes all TRCTags */
# define PNG_ICC_REQUIRED_MATRIX 0x00000700U /* All MatrixColumnTags */
# define PNG_ICC_AToB0Tag 0x00010000U
# define PNG_ICC_BToA0Tag 0x00020000U
# define PNG_ICC_AToB1Tag 0x00040000U
# define PNG_ICC_BToA1Tag 0x00080000U
# define PNG_ICC_AToB2Tag 0x00100000U
# define PNG_ICC_BToA2Tag 0x00200000U
# define PNG_ICC_AToB_TAGS 0x00050000U /* Just AToB0 and AToB1 */
# define PNG_ICC_ALL_LUT 0x003f0000U
/* 0x00400000U reserved */
/* 0x00800000U reserved */
/* The ICC profile specification allows for shortcuts in the cHRM calculation
* via the colorant table (clrt) or the chromaticity tag (chrm).
*/
# define PNG_ICC_chromaticityTag 0x01000000U
# define PNG_ICC_colorantTableTag 0x02000000U
# define PNG_ICC_gamutTag 0x04000000U
/* General flags for the 'flags' field */
#define PNG_COLORSPACE_HAVE_GAMMA 0x0001
#define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
@@ -548,17 +479,5 @@ struct png_struct_def
png_colorspace colorspace;
#endif
#endif
#ifdef PNG_ICC_SUPPORTED
/* Full ICC support requires an external CMS be registered in the png_struct
* after it is created. The registration stores this information.
*/
png_cms_transform_ptr cms_transform_fn;
png_cms_datap cms_data_ptr;
#ifdef PNG_READ_SUPPORTED
int cms_bytes_per_pixel; /* non-standard output size */
int cms_intent; /* for non-standard output */
#endif
#endif /* PNG_ICC_SUPPORTED */
};
#endif /* PNGSTRUCT_H */