e26d0c62e0
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28413 a1c6a512-1295-4272-9138-f99709370657
141 lines
5.4 KiB
C
141 lines
5.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$id $
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*
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* Copyright (C) 2009 by Christophe Gouiran <bechris13250 -at- gmail -dot- com>
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*
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* Based on lodepng, a lightweight png decoder/encoder
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* (c) 2005-2008 Lode Vandevenne
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*
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* Copyright (c) 2010 Marcin Bukat
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* - pixel format conversion & transparency handling
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* - adaptation of tinf (tiny inflate library)
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* - code refactoring & cleanups
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#define OUT_OF_MEMORY 9900
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#define FILE_TOO_LARGE 9910
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/* PNG chunk types signatures */
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/* critical chunks */
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#define PNG_CHUNK_IHDR 0x49484452
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#define PNG_CHUNK_PLTE 0x504c5445
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#define PNG_CHUNK_IDAT 0x49444154
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#define PNG_CHUNK_IEND 0x49454e44
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/* ancillary chunks */
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#define PNG_CHUNK_bKGD 0x624b4744
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#define PNG_CHUNK_cHRM 0x6348524d
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#define PNG_CHUNK_gAMA 0x67414d41
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#define PNG_CHUNK_hIST 0x68495354
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#define PNG_CHUNK_iCCP 0x69434350
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#define PNG_CHUNK_pHYs 0x70485973
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#define PNG_CHUNK_sBIT 0x73424954
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#define PNG_CHUNK_sPLT 0x73504c54
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#define PNG_CHUNK_sRGB 0x73524742
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#define PNG_CHUNK_tEXt 0x74455874
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#define PNG_CHUNK_tIME 0x74494d45
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#define PNG_CHUNK_tRNS 0x74524e53
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#define PNG_CHUNK_zTXt 0x7a545874
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/* PNG color types */
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#define PNG_COLORTYPE_GREY 0
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#define PNG_COLORTYPE_RGB 2
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#define PNG_COLORTYPE_PALETTE 3
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#define PNG_COLORTYPE_GREYA 4
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#define PNG_COLORTYPE_RGBA 6
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/* PNG filter types */
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#define PNG_FILTERTYPE_NONE 0
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#define PNG_FILTERTYPE_SUB 1
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#define PNG_FILTERTYPE_UP 2
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#define PNG_FILTERTYPE_AVERAGE 3
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#define PNG_FILTERTYPE_PAETH 4
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#define PNG_ERROR_MIN 27
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#define PNG_ERROR_MAX 74
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/* Typedefs */
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typedef struct LodePNG_InfoColor /*info about the color type of an image*/
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{
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/*header (IHDR)*/
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unsigned colorType; /*color type*/
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unsigned bitDepth; /*bits per sample*/
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/*palette (PLTE)*/
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unsigned char palette[256 * 4]; /*palette in RGBARGBA... order*/
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size_t palettesize; /* palette size in number of colors
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* (amount of bytes is 4 * palettesize)
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*/
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/*transparent color key (tRNS)*/
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unsigned key_defined; /*is a transparent color key given?*/
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unsigned key_r; /*red component of color key*/
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unsigned key_g; /*green component of color key*/
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unsigned key_b; /*blue component of color key*/
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} LodePNG_InfoColor;
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typedef struct LodePNG_InfoPng /*information about the PNG image, except pixels and sometimes except width and height*/
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{
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/*header (IHDR), palette (PLTE) and transparency (tRNS)*/
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unsigned width; /*width of the image in pixels - filled in by decoder)*/
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unsigned height; /*height of the image in pixels - filled in by decoder)*/
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unsigned compressionMethod; /*compression method of the original file*/
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unsigned filterMethod; /*filter method of the original file*/
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unsigned interlaceMethod; /*interlace method of the original file*/
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LodePNG_InfoColor color; /*color type and bits, palette, transparency*/
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/*suggested background color (bKGD)*/
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unsigned background_r; /*red component of suggested background color*/
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unsigned background_g; /*green component of suggested background color*/
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unsigned background_b; /*blue component of suggested background color*/
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} LodePNG_InfoPng;
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typedef struct LodePNG_Decoder
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{
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unsigned char *buf; /* pointer to the buffer allocated for decoder
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* filled by LodePNG_Decoder_init()
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*/
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size_t buf_size; /* size of the buffer decoder is free to use
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* filled by LodePNG_Decoder_init()
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*/
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unsigned char *file; /* ptr to raw png file loaded */
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size_t file_size; /* size of the raw png file in mem */
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unsigned char *decoded_img; /* ptr to decoded PNG image in PNG pixel
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* format. set by decodeGeneric()
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*/
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unsigned int native_img_size; /* size of the image in native pixel
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* format
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*/
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LodePNG_InfoPng infoPng; /*info of the PNG image obtained after decoding*/
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long error;
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} LodePNG_Decoder;
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/* Public functions prototypes */
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void LodePNG_Decoder_init(LodePNG_Decoder* decoder,
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uint8_t *buf,
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size_t buf_size);
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void LodePNG_decode(LodePNG_Decoder* decoder,
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uint8_t* in,
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size_t insize,
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void (*pf_progress)(int current, int total));
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void LodePNG_inspect(LodePNG_Decoder* decoder, uint8_t *in, size_t inlength);
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const char* LodePNG_perror(LodePNG_Decoder *decoder);
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