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Diffstat (limited to 'src/renderergl1/tr_image_png.c')
| -rw-r--r-- | src/renderergl1/tr_image_png.c | 2486 |
1 files changed, 0 insertions, 2486 deletions
diff --git a/src/renderergl1/tr_image_png.c b/src/renderergl1/tr_image_png.c deleted file mode 100644 index b30c7fea..00000000 --- a/src/renderergl1/tr_image_png.c +++ /dev/null @@ -1,2486 +0,0 @@ -/* -=========================================================================== -ioquake3 png decoder -Copyright (C) 2007,2008 Joerg Dietrich - -This program is free software; you can redistribute it and/or -modify it under the terms of the GNU General Public License -as published by the Free Software Foundation; either version 2 -of the License, or (at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. -=========================================================================== -*/ - -#include "tr_local.h" - -#include "../qcommon/puff.h" - -// we could limit the png size to a lower value here -#ifndef INT_MAX -#define INT_MAX 0x1fffffff -#endif - -/* -================= -PNG LOADING -================= -*/ - -/* - * Quake 3 image format : RGBA - */ - -#define Q3IMAGE_BYTESPERPIXEL (4) - -/* - * PNG specifications - */ - -/* - * The first 8 Bytes of every PNG-File are a fixed signature - * to identify the file as a PNG. - */ - -#define PNG_Signature "\x89\x50\x4E\x47\xD\xA\x1A\xA" -#define PNG_Signature_Size (8) - -/* - * After the signature diverse chunks follow. - * A chunk consists of a header and if Length - * is bigger than 0 a body and a CRC of the body follow. - */ - -struct PNG_ChunkHeader -{ - uint32_t Length; - uint32_t Type; -}; - -#define PNG_ChunkHeader_Size (8) - -typedef uint32_t PNG_ChunkCRC; - -#define PNG_ChunkCRC_Size (4) - -/* - * We use the following ChunkTypes. - * All others are ignored. - */ - -#define MAKE_CHUNKTYPE(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | ((d))) - -#define PNG_ChunkType_IHDR MAKE_CHUNKTYPE('I', 'H', 'D', 'R') -#define PNG_ChunkType_PLTE MAKE_CHUNKTYPE('P', 'L', 'T', 'E') -#define PNG_ChunkType_IDAT MAKE_CHUNKTYPE('I', 'D', 'A', 'T') -#define PNG_ChunkType_IEND MAKE_CHUNKTYPE('I', 'E', 'N', 'D') -#define PNG_ChunkType_tRNS MAKE_CHUNKTYPE('t', 'R', 'N', 'S') - -/* - * Per specification the first chunk after the signature SHALL be IHDR. - */ - -struct PNG_Chunk_IHDR -{ - uint32_t Width; - uint32_t Height; - uint8_t BitDepth; - uint8_t ColourType; - uint8_t CompressionMethod; - uint8_t FilterMethod; - uint8_t InterlaceMethod; -}; - -#define PNG_Chunk_IHDR_Size (13) - -/* - * ColourTypes - */ - -#define PNG_ColourType_Grey (0) -#define PNG_ColourType_True (2) -#define PNG_ColourType_Indexed (3) -#define PNG_ColourType_GreyAlpha (4) -#define PNG_ColourType_TrueAlpha (6) - -/* - * number of colour components - * - * Grey : 1 grey - * True : 1 R, 1 G, 1 B - * Indexed : 1 index - * GreyAlpha : 1 grey, 1 alpha - * TrueAlpha : 1 R, 1 G, 1 B, 1 alpha - */ - -#define PNG_NumColourComponents_Grey (1) -#define PNG_NumColourComponents_True (3) -#define PNG_NumColourComponents_Indexed (1) -#define PNG_NumColourComponents_GreyAlpha (2) -#define PNG_NumColourComponents_TrueAlpha (4) - -/* - * For the different ColourTypes - * different BitDepths are specified. - */ - -#define PNG_BitDepth_1 ( 1) -#define PNG_BitDepth_2 ( 2) -#define PNG_BitDepth_4 ( 4) -#define PNG_BitDepth_8 ( 8) -#define PNG_BitDepth_16 (16) - -/* - * Only one valid CompressionMethod is standardized. - */ - -#define PNG_CompressionMethod_0 (0) - -/* - * Only one valid FilterMethod is currently standardized. - */ - -#define PNG_FilterMethod_0 (0) - -/* - * This FilterMethod defines 5 FilterTypes - */ - -#define PNG_FilterType_None (0) -#define PNG_FilterType_Sub (1) -#define PNG_FilterType_Up (2) -#define PNG_FilterType_Average (3) -#define PNG_FilterType_Paeth (4) - -/* - * Two InterlaceMethods are standardized : - * 0 - NonInterlaced - * 1 - Interlaced - */ - -#define PNG_InterlaceMethod_NonInterlaced (0) -#define PNG_InterlaceMethod_Interlaced (1) - -/* - * The Adam7 interlace method uses 7 passes. - */ - -#define PNG_Adam7_NumPasses (7) - -/* - * The compressed data starts with a header ... - */ - -struct PNG_ZlibHeader -{ - uint8_t CompressionMethod; - uint8_t Flags; -}; - -#define PNG_ZlibHeader_Size (2) - -/* - * ... and is followed by a check value - */ - -#define PNG_ZlibCheckValue_Size (4) - -/* - * Some support functions for buffered files follow. - */ - -/* - * buffered file representation - */ - -struct BufferedFile -{ - byte *Buffer; - int Length; - byte *Ptr; - int BytesLeft; -}; - -/* - * Read a file into a buffer. - */ - -static struct BufferedFile *ReadBufferedFile(const char *name) -{ - struct BufferedFile *BF; - union { - byte *b; - void *v; - } buffer; - - /* - * input verification - */ - - if(!name) - { - return(NULL); - } - - /* - * Allocate control struct. - */ - - BF = ri.Malloc(sizeof(struct BufferedFile)); - if(!BF) - { - return(NULL); - } - - /* - * Initialize the structs components. - */ - - BF->Length = 0; - BF->Buffer = NULL; - BF->Ptr = NULL; - BF->BytesLeft = 0; - - /* - * Read the file. - */ - - BF->Length = ri.FS_ReadFile((char *) name, &buffer.v); - BF->Buffer = buffer.b; - - /* - * Did we get it? Is it big enough? - */ - - if(!(BF->Buffer && (BF->Length > 0))) - { - ri.Free(BF); - - return(NULL); - } - - /* - * Set the pointers and counters. - */ - - BF->Ptr = BF->Buffer; - BF->BytesLeft = BF->Length; - - return(BF); -} - -/* - * Close a buffered file. - */ - -static void CloseBufferedFile(struct BufferedFile *BF) -{ - if(BF) - { - if(BF->Buffer) - { - ri.FS_FreeFile(BF->Buffer); - } - - ri.Free(BF); - } -} - -/* - * Get a pointer to the requested bytes. - */ - -static void *BufferedFileRead(struct BufferedFile *BF, unsigned Length) -{ - void *RetVal; - - /* - * input verification - */ - - if(!(BF && Length)) - { - return(NULL); - } - - /* - * not enough bytes left - */ - - if(Length > BF->BytesLeft) - { - return(NULL); - } - - /* - * the pointer to the requested data - */ - - RetVal = BF->Ptr; - - /* - * Raise the pointer and counter. - */ - - BF->Ptr += Length; - BF->BytesLeft -= Length; - - return(RetVal); -} - -/* - * Rewind the buffer. - */ - -static qboolean BufferedFileRewind(struct BufferedFile *BF, unsigned Offset) -{ - unsigned BytesRead; - - /* - * input verification - */ - - if(!BF) - { - return(qfalse); - } - - /* - * special trick to rewind to the beginning of the buffer - */ - - if(Offset == (unsigned)-1) - { - BF->Ptr = BF->Buffer; - BF->BytesLeft = BF->Length; - - return(qtrue); - } - - /* - * How many bytes do we have already read? - */ - - BytesRead = BF->Ptr - BF->Buffer; - - /* - * We can only rewind to the beginning of the BufferedFile. - */ - - if(Offset > BytesRead) - { - return(qfalse); - } - - /* - * lower the pointer and counter. - */ - - BF->Ptr -= Offset; - BF->BytesLeft += Offset; - - return(qtrue); -} - -/* - * Skip some bytes. - */ - -static qboolean BufferedFileSkip(struct BufferedFile *BF, unsigned Offset) -{ - /* - * input verification - */ - - if(!BF) - { - return(qfalse); - } - - /* - * We can only skip to the end of the BufferedFile. - */ - - if(Offset > BF->BytesLeft) - { - return(qfalse); - } - - /* - * lower the pointer and counter. - */ - - BF->Ptr += Offset; - BF->BytesLeft -= Offset; - - return(qtrue); -} - -/* - * Find a chunk - */ - -static qboolean FindChunk(struct BufferedFile *BF, uint32_t ChunkType) -{ - struct PNG_ChunkHeader *CH; - - uint32_t Length; - uint32_t Type; - - /* - * input verification - */ - - if(!BF) - { - return(qfalse); - } - - /* - * cycle trough the chunks - */ - - while(qtrue) - { - /* - * Read the chunk-header. - */ - - CH = BufferedFileRead(BF, PNG_ChunkHeader_Size); - if(!CH) - { - return(qfalse); - } - - /* - * Do not swap the original types - * they might be needed later. - */ - - Length = BigLong(CH->Length); - Type = BigLong(CH->Type); - - /* - * We found it! - */ - - if(Type == ChunkType) - { - /* - * Rewind to the start of the chunk. - */ - - BufferedFileRewind(BF, PNG_ChunkHeader_Size); - - break; - } - else - { - /* - * Skip the rest of the chunk. - */ - - if(Length) - { - if(!BufferedFileSkip(BF, Length + PNG_ChunkCRC_Size)) - { - return(qfalse); - } - } - } - } - - return(qtrue); -} - -/* - * Decompress all IDATs - */ - -static uint32_t DecompressIDATs(struct BufferedFile *BF, uint8_t **Buffer) -{ - uint8_t *DecompressedData; - uint32_t DecompressedDataLength; - - uint8_t *CompressedData; - uint8_t *CompressedDataPtr; - uint32_t CompressedDataLength; - - struct PNG_ChunkHeader *CH; - - uint32_t Length; - uint32_t Type; - - int BytesToRewind; - - int32_t puffResult; - uint8_t *puffDest; - uint32_t puffDestLen; - uint8_t *puffSrc; - uint32_t puffSrcLen; - - /* - * input verification - */ - - if(!(BF && Buffer)) - { - return(-1); - } - - /* - * some zeroing - */ - - DecompressedData = NULL; - DecompressedDataLength = 0; - *Buffer = DecompressedData; - - CompressedData = NULL; - CompressedDataLength = 0; - - BytesToRewind = 0; - - /* - * Find the first IDAT chunk. - */ - - if(!FindChunk(BF, PNG_ChunkType_IDAT)) - { - return(-1); - } - - /* - * Count the size of the uncompressed data - */ - - while(qtrue) - { - /* - * Read chunk header - */ - - CH = BufferedFileRead(BF, PNG_ChunkHeader_Size); - if(!CH) - { - /* - * Rewind to the start of this adventure - * and return unsuccessfull - */ - - BufferedFileRewind(BF, BytesToRewind); - - return(-1); - } - - /* - * Length and Type of chunk - */ - - Length = BigLong(CH->Length); - Type = BigLong(CH->Type); - - /* - * We have reached the end of the IDAT chunks - */ - - if(!(Type == PNG_ChunkType_IDAT)) - { - BufferedFileRewind(BF, PNG_ChunkHeader_Size); - - break; - } - - /* - * Add chunk header to count. - */ - - BytesToRewind += PNG_ChunkHeader_Size; - - /* - * Skip to next chunk - */ - - if(Length) - { - if(!BufferedFileSkip(BF, Length + PNG_ChunkCRC_Size)) - { - BufferedFileRewind(BF, BytesToRewind); - - return(-1); - } - - BytesToRewind += Length + PNG_ChunkCRC_Size; - CompressedDataLength += Length; - } - } - - BufferedFileRewind(BF, BytesToRewind); - - CompressedData = ri.Malloc(CompressedDataLength); - if(!CompressedData) - { - return(-1); - } - - CompressedDataPtr = CompressedData; - - /* - * Collect the compressed Data - */ - - while(qtrue) - { - /* - * Read chunk header - */ - - CH = BufferedFileRead(BF, PNG_ChunkHeader_Size); - if(!CH) - { - ri.Free(CompressedData); - - return(-1); - } - - /* - * Length and Type of chunk - */ - - Length = BigLong(CH->Length); - Type = BigLong(CH->Type); - - /* - * We have reached the end of the IDAT chunks - */ - - if(!(Type == PNG_ChunkType_IDAT)) - { - BufferedFileRewind(BF, PNG_ChunkHeader_Size); - - break; - } - - /* - * Copy the Data - */ - - if(Length) - { - uint8_t *OrigCompressedData; - - OrigCompressedData = BufferedFileRead(BF, Length); - if(!OrigCompressedData) - { - ri.Free(CompressedData); - - return(-1); - } - - if(!BufferedFileSkip(BF, PNG_ChunkCRC_Size)) - { - ri.Free(CompressedData); - - return(-1); - } - - memcpy(CompressedDataPtr, OrigCompressedData, Length); - CompressedDataPtr += Length; - } - } - - /* - * Let puff() calculate the decompressed data length. - */ - - puffDest = NULL; - puffDestLen = 0; - - /* - * The zlib header and checkvalue don't belong to the compressed data. - */ - - puffSrc = CompressedData + PNG_ZlibHeader_Size; - puffSrcLen = CompressedDataLength - PNG_ZlibHeader_Size - PNG_ZlibCheckValue_Size; - - /* - * first puff() to calculate the size of the uncompressed data - */ - - puffResult = puff(puffDest, &puffDestLen, puffSrc, &puffSrcLen); - if(!((puffResult == 0) && (puffDestLen > 0))) - { - ri.Free(CompressedData); - - return(-1); - } - - /* - * Allocate the buffer for the uncompressed data. - */ - - DecompressedData = ri.Malloc(puffDestLen); - if(!DecompressedData) - { - ri.Free(CompressedData); - - return(-1); - } - - /* - * Set the input again in case something was changed by the last puff() . - */ - - puffDest = DecompressedData; - puffSrc = CompressedData + PNG_ZlibHeader_Size; - puffSrcLen = CompressedDataLength - PNG_ZlibHeader_Size - PNG_ZlibCheckValue_Size; - - /* - * decompression puff() - */ - - puffResult = puff(puffDest, &puffDestLen, puffSrc, &puffSrcLen); - - /* - * The compressed data is not needed anymore. - */ - - ri.Free(CompressedData); - - /* - * Check if the last puff() was successfull. - */ - - if(!((puffResult == 0) && (puffDestLen > 0))) - { - ri.Free(DecompressedData); - - return(-1); - } - - /* - * Set the output of this function. - */ - - DecompressedDataLength = puffDestLen; - *Buffer = DecompressedData; - - return(DecompressedDataLength); -} - -/* - * the Paeth predictor - */ - -static uint8_t PredictPaeth(uint8_t a, uint8_t b, uint8_t c) -{ - /* - * a == Left - * b == Up - * c == UpLeft - */ - - uint8_t Pr; - int p; - int pa, pb, pc; - - p = ((int) a) + ((int) b) - ((int) c); - pa = abs(p - ((int) a)); - pb = abs(p - ((int) b)); - pc = abs(p - ((int) c)); - - if((pa <= pb) && (pa <= pc)) - { - Pr = a; - } - else if(pb <= pc) - { - Pr = b; - } - else - { - Pr = c; - } - - return(Pr); - -} - -/* - * Reverse the filters. - */ - -static qboolean UnfilterImage(uint8_t *DecompressedData, - uint32_t ImageHeight, - uint32_t BytesPerScanline, - uint32_t BytesPerPixel) -{ - uint8_t *DecompPtr; - uint8_t FilterType; - uint8_t *PixelLeft, *PixelUp, *PixelUpLeft; - uint32_t w, h, p; - - /* - * some zeros for the filters - */ - - uint8_t Zeros[8] = {0, 0, 0, 0, 0, 0, 0, 0}; - - /* - * input verification - */ - - if(!(DecompressedData && BytesPerPixel)) - { - return(qfalse); - } - - /* - * ImageHeight and BytesPerScanline can be zero in small interlaced images. - */ - - if((!ImageHeight) || (!BytesPerScanline)) - { - return(qtrue); - } - - /* - * Set the pointer to the start of the decompressed Data. - */ - - DecompPtr = DecompressedData; - - /* - * Un-filtering is done in place. - */ - - /* - * Go trough all scanlines. - */ - - for(h = 0; h < ImageHeight; h++) - { - /* - * Every scanline starts with a FilterType byte. - */ - - FilterType = *DecompPtr; - DecompPtr++; - - /* - * Left pixel of the first byte in a scanline is zero. - */ - - PixelLeft = Zeros; - - /* - * Set PixelUp to previous line only if we are on the second line or above. - * - * Plus one byte for the FilterType - */ - - if(h > 0) - { - PixelUp = DecompPtr - (BytesPerScanline + 1); - } - else - { - PixelUp = Zeros; - } - - /* - * The pixel left to the first pixel of the previous scanline is zero too. - */ - - PixelUpLeft = Zeros; - - /* - * Cycle trough all pixels of the scanline. - */ - - for(w = 0; w < (BytesPerScanline / BytesPerPixel); w++) - { - /* - * Cycle trough the bytes of the pixel. - */ - - for(p = 0; p < BytesPerPixel; p++) - { - switch(FilterType) - { - case PNG_FilterType_None : - { - /* - * The byte is unfiltered. - */ - - break; - } - - case PNG_FilterType_Sub : - { - DecompPtr[p] += PixelLeft[p]; - - break; - } - - case PNG_FilterType_Up : - { - DecompPtr[p] += PixelUp[p]; - - break; - } - - case PNG_FilterType_Average : - { - DecompPtr[p] += ((uint8_t) ((((uint16_t) PixelLeft[p]) + ((uint16_t) PixelUp[p])) / 2)); - - break; - } - - case PNG_FilterType_Paeth : - { - DecompPtr[p] += PredictPaeth(PixelLeft[p], PixelUp[p], PixelUpLeft[p]); - - break; - } - - default : - { - return(qfalse); - } - } - } - - PixelLeft = DecompPtr; - - /* - * We only have an upleft pixel if we are on the second line or above. - */ - - if(h > 0) - { - PixelUpLeft = DecompPtr - (BytesPerScanline + 1); - } - - /* - * Skip to the next pixel. - */ - - DecompPtr += BytesPerPixel; - - /* - * We only have a previous line if we are on the second line and above. - */ - - if(h > 0) - { - PixelUp = DecompPtr - (BytesPerScanline + 1); - } - } - } - - return(qtrue); -} - -/* - * Convert a raw input pixel to Quake 3 RGA format. - */ - -static qboolean ConvertPixel(struct PNG_Chunk_IHDR *IHDR, - byte *OutPtr, - uint8_t *DecompPtr, - qboolean HasTransparentColour, - uint8_t *TransparentColour, - uint8_t *OutPal) -{ - /* - * input verification - */ - - if(!(IHDR && OutPtr && DecompPtr && TransparentColour && OutPal)) - { - return(qfalse); - } - - switch(IHDR->ColourType) - { - case PNG_ColourType_Grey : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_1 : - case PNG_BitDepth_2 : - case PNG_BitDepth_4 : - { - uint8_t Step; - uint8_t GreyValue; - - Step = 0xFF / ((1 << IHDR->BitDepth) - 1); - - GreyValue = DecompPtr[0] * Step; - - OutPtr[0] = GreyValue; - OutPtr[1] = GreyValue; - OutPtr[2] = GreyValue; - OutPtr[3] = 0xFF; - - /* - * Grey supports full transparency for one specified colour - */ - - if(HasTransparentColour) - { - if(TransparentColour[1] == DecompPtr[0]) - { - OutPtr[3] = 0x00; - } - } - - - break; - } - - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - OutPtr[0] = DecompPtr[0]; - OutPtr[1] = DecompPtr[0]; - OutPtr[2] = DecompPtr[0]; - OutPtr[3] = 0xFF; - - /* - * Grey supports full transparency for one specified colour - */ - - if(HasTransparentColour) - { - if(IHDR->BitDepth == PNG_BitDepth_8) - { - if(TransparentColour[1] == DecompPtr[0]) - { - OutPtr[3] = 0x00; - } - } - else - { - if((TransparentColour[0] == DecompPtr[0]) && (TransparentColour[1] == DecompPtr[1])) - { - OutPtr[3] = 0x00; - } - } - } - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_True : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - { - OutPtr[0] = DecompPtr[0]; - OutPtr[1] = DecompPtr[1]; - OutPtr[2] = DecompPtr[2]; - OutPtr[3] = 0xFF; - - /* - * True supports full transparency for one specified colour - */ - - if(HasTransparentColour) - { - if((TransparentColour[1] == DecompPtr[0]) && - (TransparentColour[3] == DecompPtr[1]) && - (TransparentColour[5] == DecompPtr[2])) - { - OutPtr[3] = 0x00; - } - } - - break; - } - - case PNG_BitDepth_16 : - { - /* - * We use only the upper byte. - */ - - OutPtr[0] = DecompPtr[0]; - OutPtr[1] = DecompPtr[2]; - OutPtr[2] = DecompPtr[4]; - OutPtr[3] = 0xFF; - - /* - * True supports full transparency for one specified colour - */ - - if(HasTransparentColour) - { - if((TransparentColour[0] == DecompPtr[0]) && (TransparentColour[1] == DecompPtr[1]) && - (TransparentColour[2] == DecompPtr[2]) && (TransparentColour[3] == DecompPtr[3]) && - (TransparentColour[4] == DecompPtr[4]) && (TransparentColour[5] == DecompPtr[5])) - { - OutPtr[3] = 0x00; - } - } - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_Indexed : - { - OutPtr[0] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 0]; - OutPtr[1] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 1]; - OutPtr[2] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 2]; - OutPtr[3] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 3]; - - break; - } - - case PNG_ColourType_GreyAlpha : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - { - OutPtr[0] = DecompPtr[0]; - OutPtr[1] = DecompPtr[0]; - OutPtr[2] = DecompPtr[0]; - OutPtr[3] = DecompPtr[1]; - - break; - } - - case PNG_BitDepth_16 : - { - /* - * We use only the upper byte. - */ - - OutPtr[0] = DecompPtr[0]; - OutPtr[1] = DecompPtr[0]; - OutPtr[2] = DecompPtr[0]; - OutPtr[3] = DecompPtr[2]; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_TrueAlpha : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - { - OutPtr[0] = DecompPtr[0]; - OutPtr[1] = DecompPtr[1]; - OutPtr[2] = DecompPtr[2]; - OutPtr[3] = DecompPtr[3]; - - break; - } - - case PNG_BitDepth_16 : - { - /* - * We use only the upper byte. - */ - - OutPtr[0] = DecompPtr[0]; - OutPtr[1] = DecompPtr[2]; - OutPtr[2] = DecompPtr[4]; - OutPtr[3] = DecompPtr[6]; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - default : - { - return(qfalse); - } - } - - return(qtrue); -} - - -/* - * Decode a non-interlaced image. - */ - -static qboolean DecodeImageNonInterlaced(struct PNG_Chunk_IHDR *IHDR, - byte *OutBuffer, - uint8_t *DecompressedData, - uint32_t DecompressedDataLength, - qboolean HasTransparentColour, - uint8_t *TransparentColour, - uint8_t *OutPal) -{ - uint32_t IHDR_Width; - uint32_t IHDR_Height; - uint32_t BytesPerScanline, BytesPerPixel, PixelsPerByte; - uint32_t w, h, p; - byte *OutPtr; - uint8_t *DecompPtr; - - /* - * input verification - */ - - if(!(IHDR && OutBuffer && DecompressedData && DecompressedDataLength && TransparentColour && OutPal)) - { - return(qfalse); - } - - /* - * byte swapping - */ - - IHDR_Width = BigLong(IHDR->Width); - IHDR_Height = BigLong(IHDR->Height); - - /* - * information for un-filtering - */ - - switch(IHDR->ColourType) - { - case PNG_ColourType_Grey : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_1 : - case PNG_BitDepth_2 : - case PNG_BitDepth_4 : - { - BytesPerPixel = 1; - PixelsPerByte = 8 / IHDR->BitDepth; - - break; - } - - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_Grey; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_True : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_True; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_Indexed : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_1 : - case PNG_BitDepth_2 : - case PNG_BitDepth_4 : - { - BytesPerPixel = 1; - PixelsPerByte = 8 / IHDR->BitDepth; - - break; - } - - case PNG_BitDepth_8 : - { - BytesPerPixel = PNG_NumColourComponents_Indexed; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_GreyAlpha : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_GreyAlpha; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_TrueAlpha : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_TrueAlpha; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - default : - { - return(qfalse); - } - } - - /* - * Calculate the size of one scanline - */ - - BytesPerScanline = (IHDR_Width * BytesPerPixel + (PixelsPerByte - 1)) / PixelsPerByte; - - /* - * Check if we have enough data for the whole image. - */ - - if(!(DecompressedDataLength == ((BytesPerScanline + 1) * IHDR_Height))) - { - return(qfalse); - } - - /* - * Unfilter the image. - */ - - if(!UnfilterImage(DecompressedData, IHDR_Height, BytesPerScanline, BytesPerPixel)) - { - return(qfalse); - } - - /* - * Set the working pointers to the beginning of the buffers. - */ - - OutPtr = OutBuffer; - DecompPtr = DecompressedData; - - /* - * Create the output image. - */ - - for(h = 0; h < IHDR_Height; h++) - { - /* - * Count the pixels on the scanline for those multipixel bytes - */ - - uint32_t CurrPixel; - - /* - * skip FilterType - */ - - DecompPtr++; - - /* - * Reset the pixel count. - */ - - CurrPixel = 0; - - for(w = 0; w < (BytesPerScanline / BytesPerPixel); w++) - { - if(PixelsPerByte > 1) - { - uint8_t Mask; - uint32_t Shift; - uint8_t SinglePixel; - - for(p = 0; p < PixelsPerByte; p++) - { - if(CurrPixel < IHDR_Width) - { - Mask = (1 << IHDR->BitDepth) - 1; - Shift = (PixelsPerByte - 1 - p) * IHDR->BitDepth; - - SinglePixel = ((DecompPtr[0] & (Mask << Shift)) >> Shift); - - if(!ConvertPixel(IHDR, OutPtr, &SinglePixel, HasTransparentColour, TransparentColour, OutPal)) - { - return(qfalse); - } - - OutPtr += Q3IMAGE_BYTESPERPIXEL; - CurrPixel++; - } - } - - } - else - { - if(!ConvertPixel(IHDR, OutPtr, DecompPtr, HasTransparentColour, TransparentColour, OutPal)) - { - return(qfalse); - } - - - OutPtr += Q3IMAGE_BYTESPERPIXEL; - } - - DecompPtr += BytesPerPixel; - } - } - - return(qtrue); -} - -/* - * Decode an interlaced image. - */ - -static qboolean DecodeImageInterlaced(struct PNG_Chunk_IHDR *IHDR, - byte *OutBuffer, - uint8_t *DecompressedData, - uint32_t DecompressedDataLength, - qboolean HasTransparentColour, - uint8_t *TransparentColour, - uint8_t *OutPal) -{ - uint32_t IHDR_Width; - uint32_t IHDR_Height; - uint32_t BytesPerScanline[PNG_Adam7_NumPasses], BytesPerPixel, PixelsPerByte; - uint32_t PassWidth[PNG_Adam7_NumPasses], PassHeight[PNG_Adam7_NumPasses]; - uint32_t WSkip[PNG_Adam7_NumPasses], WOffset[PNG_Adam7_NumPasses], HSkip[PNG_Adam7_NumPasses], HOffset[PNG_Adam7_NumPasses]; - uint32_t w, h, p, a; - byte *OutPtr; - uint8_t *DecompPtr; - uint32_t TargetLength; - - /* - * input verification - */ - - if(!(IHDR && OutBuffer && DecompressedData && DecompressedDataLength && TransparentColour && OutPal)) - { - return(qfalse); - } - - /* - * byte swapping - */ - - IHDR_Width = BigLong(IHDR->Width); - IHDR_Height = BigLong(IHDR->Height); - - /* - * Skip and Offset for the passes. - */ - - WSkip[0] = 8; - WOffset[0] = 0; - HSkip[0] = 8; - HOffset[0] = 0; - - WSkip[1] = 8; - WOffset[1] = 4; - HSkip[1] = 8; - HOffset[1] = 0; - - WSkip[2] = 4; - WOffset[2] = 0; - HSkip[2] = 8; - HOffset[2] = 4; - - WSkip[3] = 4; - WOffset[3] = 2; - HSkip[3] = 4; - HOffset[3] = 0; - - WSkip[4] = 2; - WOffset[4] = 0; - HSkip[4] = 4; - HOffset[4] = 2; - - WSkip[5] = 2; - WOffset[5] = 1; - HSkip[5] = 2; - HOffset[5] = 0; - - WSkip[6] = 1; - WOffset[6] = 0; - HSkip[6] = 2; - HOffset[6] = 1; - - /* - * Calculate the sizes of the passes. - */ - - PassWidth[0] = (IHDR_Width + 7) / 8; - PassHeight[0] = (IHDR_Height + 7) / 8; - - PassWidth[1] = (IHDR_Width + 3) / 8; - PassHeight[1] = (IHDR_Height + 7) / 8; - - PassWidth[2] = (IHDR_Width + 3) / 4; - PassHeight[2] = (IHDR_Height + 3) / 8; - - PassWidth[3] = (IHDR_Width + 1) / 4; - PassHeight[3] = (IHDR_Height + 3) / 4; - - PassWidth[4] = (IHDR_Width + 1) / 2; - PassHeight[4] = (IHDR_Height + 1) / 4; - - PassWidth[5] = (IHDR_Width + 0) / 2; - PassHeight[5] = (IHDR_Height + 1) / 2; - - PassWidth[6] = (IHDR_Width + 0) / 1; - PassHeight[6] = (IHDR_Height + 0) / 2; - - /* - * information for un-filtering - */ - - switch(IHDR->ColourType) - { - case PNG_ColourType_Grey : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_1 : - case PNG_BitDepth_2 : - case PNG_BitDepth_4 : - { - BytesPerPixel = 1; - PixelsPerByte = 8 / IHDR->BitDepth; - - break; - } - - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_Grey; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_True : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_True; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_Indexed : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_1 : - case PNG_BitDepth_2 : - case PNG_BitDepth_4 : - { - BytesPerPixel = 1; - PixelsPerByte = 8 / IHDR->BitDepth; - - break; - } - - case PNG_BitDepth_8 : - { - BytesPerPixel = PNG_NumColourComponents_Indexed; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_GreyAlpha : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_GreyAlpha; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - case PNG_ColourType_TrueAlpha : - { - switch(IHDR->BitDepth) - { - case PNG_BitDepth_8 : - case PNG_BitDepth_16 : - { - BytesPerPixel = (IHDR->BitDepth / 8) * PNG_NumColourComponents_TrueAlpha; - PixelsPerByte = 1; - - break; - } - - default : - { - return(qfalse); - } - } - - break; - } - - default : - { - return(qfalse); - } - } - - /* - * Calculate the size of the scanlines per pass - */ - - for(a = 0; a < PNG_Adam7_NumPasses; a++) - { - BytesPerScanline[a] = (PassWidth[a] * BytesPerPixel + (PixelsPerByte - 1)) / PixelsPerByte; - } - - /* - * Calculate the size of all passes - */ - - TargetLength = 0; - - for(a = 0; a < PNG_Adam7_NumPasses; a++) - { - TargetLength += ((BytesPerScanline[a] + (BytesPerScanline[a] ? 1 : 0)) * PassHeight[a]); - } - - /* - * Check if we have enough data for the whole image. - */ - - if(!(DecompressedDataLength == TargetLength)) - { - return(qfalse); - } - - /* - * Unfilter the image. - */ - - DecompPtr = DecompressedData; - - for(a = 0; a < PNG_Adam7_NumPasses; a++) - { - if(!UnfilterImage(DecompPtr, PassHeight[a], BytesPerScanline[a], BytesPerPixel)) - { - return(qfalse); - } - - DecompPtr += ((BytesPerScanline[a] + (BytesPerScanline[a] ? 1 : 0)) * PassHeight[a]); - } - - /* - * Set the working pointers to the beginning of the buffers. - */ - - DecompPtr = DecompressedData; - - /* - * Create the output image. - */ - - for(a = 0; a < PNG_Adam7_NumPasses; a++) - { - for(h = 0; h < PassHeight[a]; h++) - { - /* - * Count the pixels on the scanline for those multipixel bytes - */ - - uint32_t CurrPixel; - - /* - * skip FilterType - * but only when the pass has a width bigger than zero - */ - - if(BytesPerScanline[a]) - { - DecompPtr++; - } - - /* - * Reset the pixel count. - */ - - CurrPixel = 0; - - for(w = 0; w < (BytesPerScanline[a] / BytesPerPixel); w++) - { - if(PixelsPerByte > 1) - { - uint8_t Mask; - uint32_t Shift; - uint8_t SinglePixel; - - for(p = 0; p < PixelsPerByte; p++) - { - if(CurrPixel < PassWidth[a]) - { - Mask = (1 << IHDR->BitDepth) - 1; - Shift = (PixelsPerByte - 1 - p) * IHDR->BitDepth; - - SinglePixel = ((DecompPtr[0] & (Mask << Shift)) >> Shift); - - OutPtr = OutBuffer + (((((h * HSkip[a]) + HOffset[a]) * IHDR_Width) + ((CurrPixel * WSkip[a]) + WOffset[a])) * Q3IMAGE_BYTESPERPIXEL); - - if(!ConvertPixel(IHDR, OutPtr, &SinglePixel, HasTransparentColour, TransparentColour, OutPal)) - { - return(qfalse); - } - - CurrPixel++; - } - } - - } - else - { - OutPtr = OutBuffer + (((((h * HSkip[a]) + HOffset[a]) * IHDR_Width) + ((w * WSkip[a]) + WOffset[a])) * Q3IMAGE_BYTESPERPIXEL); - - if(!ConvertPixel(IHDR, OutPtr, DecompPtr, HasTransparentColour, TransparentColour, OutPal)) - { - return(qfalse); - } - } - - DecompPtr += BytesPerPixel; - } - } - } - - return(qtrue); -} - -/* - * The PNG loader - */ - -void R_LoadPNG(const char *name, byte **pic, int *width, int *height) -{ - struct BufferedFile *ThePNG; - byte *OutBuffer; - uint8_t *Signature; - struct PNG_ChunkHeader *CH; - uint32_t ChunkHeaderLength; - uint32_t ChunkHeaderType; - struct PNG_Chunk_IHDR *IHDR; - uint32_t IHDR_Width; - uint32_t IHDR_Height; - PNG_ChunkCRC *CRC; - uint8_t *InPal; - uint8_t *DecompressedData; - uint32_t DecompressedDataLength; - uint32_t i; - - /* - * palette with 256 RGBA entries - */ - - uint8_t OutPal[1024]; - - /* - * transparent colour from the tRNS chunk - */ - - qboolean HasTransparentColour = qfalse; - uint8_t TransparentColour[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; - - /* - * input verification - */ - - if(!(name && pic)) - { - return; - } - - /* - * Zero out return values. - */ - - *pic = NULL; - - if(width) - { - *width = 0; - } - - if(height) - { - *height = 0; - } - - /* - * Read the file. - */ - - ThePNG = ReadBufferedFile(name); - if(!ThePNG) - { - return; - } - - /* - * Read the siganture of the file. - */ - - Signature = BufferedFileRead(ThePNG, PNG_Signature_Size); - if(!Signature) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Is it a PNG? - */ - - if(memcmp(Signature, PNG_Signature, PNG_Signature_Size)) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the first chunk-header. - */ - - CH = BufferedFileRead(ThePNG, PNG_ChunkHeader_Size); - if(!CH) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * PNG multi-byte types are in Big Endian - */ - - ChunkHeaderLength = BigLong(CH->Length); - ChunkHeaderType = BigLong(CH->Type); - - /* - * Check if the first chunk is an IHDR. - */ - - if(!((ChunkHeaderType == PNG_ChunkType_IHDR) && (ChunkHeaderLength == PNG_Chunk_IHDR_Size))) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the IHDR. - */ - - IHDR = BufferedFileRead(ThePNG, PNG_Chunk_IHDR_Size); - if(!IHDR) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the CRC for IHDR - */ - - CRC = BufferedFileRead(ThePNG, PNG_ChunkCRC_Size); - if(!CRC) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Here we could check the CRC if we wanted to. - */ - - /* - * multi-byte type swapping - */ - - IHDR_Width = BigLong(IHDR->Width); - IHDR_Height = BigLong(IHDR->Height); - - /* - * Check if Width and Height are valid. - */ - - if(!((IHDR_Width > 0) && (IHDR_Height > 0)) - || IHDR_Width > INT_MAX / Q3IMAGE_BYTESPERPIXEL / IHDR_Height) - { - CloseBufferedFile(ThePNG); - - ri.Printf( PRINT_WARNING, "%s: invalid image size\n", name ); - - return; - } - - /* - * Do we need to check if the dimensions of the image are valid for Quake3? - */ - - /* - * Check if CompressionMethod and FilterMethod are valid. - */ - - if(!((IHDR->CompressionMethod == PNG_CompressionMethod_0) && (IHDR->FilterMethod == PNG_FilterMethod_0))) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Check if InterlaceMethod is valid. - */ - - if(!((IHDR->InterlaceMethod == PNG_InterlaceMethod_NonInterlaced) || (IHDR->InterlaceMethod == PNG_InterlaceMethod_Interlaced))) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read palette for an indexed image. - */ - - if(IHDR->ColourType == PNG_ColourType_Indexed) - { - /* - * We need the palette first. - */ - - if(!FindChunk(ThePNG, PNG_ChunkType_PLTE)) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the chunk-header. - */ - - CH = BufferedFileRead(ThePNG, PNG_ChunkHeader_Size); - if(!CH) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * PNG multi-byte types are in Big Endian - */ - - ChunkHeaderLength = BigLong(CH->Length); - ChunkHeaderType = BigLong(CH->Type); - - /* - * Check if the chunk is a PLTE. - */ - - if(!(ChunkHeaderType == PNG_ChunkType_PLTE)) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Check if Length is divisible by 3 - */ - - if(ChunkHeaderLength % 3) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the raw palette data - */ - - InPal = BufferedFileRead(ThePNG, ChunkHeaderLength); - if(!InPal) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the CRC for the palette - */ - - CRC = BufferedFileRead(ThePNG, PNG_ChunkCRC_Size); - if(!CRC) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Set some default values. - */ - - for(i = 0; i < 256; i++) - { - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 0] = 0x00; - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 1] = 0x00; - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 2] = 0x00; - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 3] = 0xFF; - } - - /* - * Convert to the Quake3 RGBA-format. - */ - - for(i = 0; i < (ChunkHeaderLength / 3); i++) - { - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 0] = InPal[i*3+0]; - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 1] = InPal[i*3+1]; - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 2] = InPal[i*3+2]; - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 3] = 0xFF; - } - } - - /* - * transparency information is sometimes stored in a tRNS chunk - */ - - /* - * Let's see if there is a tRNS chunk - */ - - if(FindChunk(ThePNG, PNG_ChunkType_tRNS)) - { - uint8_t *Trans; - - /* - * Read the chunk-header. - */ - - CH = BufferedFileRead(ThePNG, PNG_ChunkHeader_Size); - if(!CH) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * PNG multi-byte types are in Big Endian - */ - - ChunkHeaderLength = BigLong(CH->Length); - ChunkHeaderType = BigLong(CH->Type); - - /* - * Check if the chunk is a tRNS. - */ - - if(!(ChunkHeaderType == PNG_ChunkType_tRNS)) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the transparency information. - */ - - Trans = BufferedFileRead(ThePNG, ChunkHeaderLength); - if(!Trans) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Read the CRC. - */ - - CRC = BufferedFileRead(ThePNG, PNG_ChunkCRC_Size); - if(!CRC) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Only for Grey, True and Indexed ColourType should tRNS exist. - */ - - switch(IHDR->ColourType) - { - case PNG_ColourType_Grey : - { - if(!ChunkHeaderLength == 2) - { - CloseBufferedFile(ThePNG); - - return; - } - - HasTransparentColour = qtrue; - - /* - * Grey can have one colour which is completely transparent. - * This colour is always stored in 16 bits. - */ - - TransparentColour[0] = Trans[0]; - TransparentColour[1] = Trans[1]; - - break; - } - - case PNG_ColourType_True : - { - if(!ChunkHeaderLength == 6) - { - CloseBufferedFile(ThePNG); - - return; - } - - HasTransparentColour = qtrue; - - /* - * True can have one colour which is completely transparent. - * This colour is always stored in 16 bits. - */ - - TransparentColour[0] = Trans[0]; - TransparentColour[1] = Trans[1]; - TransparentColour[2] = Trans[2]; - TransparentColour[3] = Trans[3]; - TransparentColour[4] = Trans[4]; - TransparentColour[5] = Trans[5]; - - break; - } - - case PNG_ColourType_Indexed : - { - /* - * Maximum of 256 one byte transparency entries. - */ - - if(ChunkHeaderLength > 256) - { - CloseBufferedFile(ThePNG); - - return; - } - - HasTransparentColour = qtrue; - - /* - * alpha values for palette entries - */ - - for(i = 0; i < ChunkHeaderLength; i++) - { - OutPal[i * Q3IMAGE_BYTESPERPIXEL + 3] = Trans[i]; - } - - break; - } - - /* - * All other ColourTypes should not have tRNS chunks - */ - - default : - { - CloseBufferedFile(ThePNG); - - return; - } - } - } - - /* - * Rewind to the start of the file. - */ - - if(!BufferedFileRewind(ThePNG, -1)) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Skip the signature - */ - - if(!BufferedFileSkip(ThePNG, PNG_Signature_Size)) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Decompress all IDAT chunks - */ - - DecompressedDataLength = DecompressIDATs(ThePNG, &DecompressedData); - if(!(DecompressedDataLength && DecompressedData)) - { - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Allocate output buffer. - */ - - OutBuffer = ri.Malloc(IHDR_Width * IHDR_Height * Q3IMAGE_BYTESPERPIXEL); - if(!OutBuffer) - { - ri.Free(DecompressedData); - CloseBufferedFile(ThePNG); - - return; - } - - /* - * Interlaced and Non-interlaced images need to be handled differently. - */ - - switch(IHDR->InterlaceMethod) - { - case PNG_InterlaceMethod_NonInterlaced : - { - if(!DecodeImageNonInterlaced(IHDR, OutBuffer, DecompressedData, DecompressedDataLength, HasTransparentColour, TransparentColour, OutPal)) - { - ri.Free(OutBuffer); - ri.Free(DecompressedData); - CloseBufferedFile(ThePNG); - - return; - } - - break; - } - - case PNG_InterlaceMethod_Interlaced : - { - if(!DecodeImageInterlaced(IHDR, OutBuffer, DecompressedData, DecompressedDataLength, HasTransparentColour, TransparentColour, OutPal)) - { - ri.Free(OutBuffer); - ri.Free(DecompressedData); - CloseBufferedFile(ThePNG); - - return; - } - - break; - } - - default : - { - ri.Free(OutBuffer); - ri.Free(DecompressedData); - CloseBufferedFile(ThePNG); - - return; - } - } - - /* - * update the pointer to the image data - */ - - *pic = OutBuffer; - - /* - * Fill width and height. - */ - - if(width) - { - *width = IHDR_Width; - } - - if(height) - { - *height = IHDR_Height; - } - - /* - * DecompressedData is not needed anymore. - */ - - ri.Free(DecompressedData); - - /* - * We have all data, so close the file. - */ - - CloseBufferedFile(ThePNG); -} |