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-rw-r--r--code/renderer/tr_image.c2488
1 files changed, 2475 insertions, 13 deletions
diff --git a/code/renderer/tr_image.c b/code/renderer/tr_image.c
index 30a9b6b..e6990b9 100644
--- a/code/renderer/tr_image.c
+++ b/code/renderer/tr_image.c
@@ -33,10 +33,13 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#define JPEG_INTERNALS
#include "../jpeg-6/jpeglib.h"
+#include "../qcommon/puff.h"
+
static void LoadBMP( const char *name, byte **pic, int *width, int *height );
static void LoadTGA( const char *name, byte **pic, int *width, int *height );
static void LoadJPG( const char *name, byte **pic, int *width, int *height );
+static void LoadPNG( const char *name, byte **pic, int *width, int *height );
static byte s_intensitytable[256];
static unsigned char s_gammatable[256];
@@ -1931,6 +1934,2450 @@ int SaveJPGToBuffer( byte *buffer, int quality,
/*
=================
+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;
+
+ /*
+ * 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, (void **) &BF->Buffer);
+
+ /*
+ * 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, int 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, int Offset)
+{
+ int BytesRead;
+
+ /*
+ * input verification
+ */
+
+ if(!BF)
+ {
+ return(qfalse);
+ }
+
+ /*
+ * special trick to rewind to the beginning of the buffer
+ */
+
+ if(Offset == -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, int 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;
+
+ Pr = 0;
+
+ 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
+ *
+ * ImageHeight and BytesPerScanline are not checked,
+ * because these can be zero in some interlace passes.
+ */
+
+ if(!(DecompressedData && BytesPerPixel))
+ {
+ return(qfalse);
+ }
+
+
+ /*
+ * 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 a 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[3]))
+ {
+ 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
+ */
+
+ 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
+ */
+
+static void 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)))
+ {
+ CloseBufferedFile(ThePNG);
+
+ 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 an 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 an 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 an 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);
+}
+
+//===================================================================
+
+/*
+=================
R_LoadImage
Loads any of the supported image types into a cannonical
@@ -1950,23 +4397,38 @@ void R_LoadImage( const char *name, byte **pic, int *width, int *height ) {
}
if ( !Q_stricmp( name+len-4, ".tga" ) ) {
- LoadTGA( name, pic, width, height ); // try tga first
- if (!*pic) { //
- char altname[MAX_QPATH]; // try jpg in place of tga
- strcpy( altname, name );
- len = strlen( altname );
- altname[len-3] = 'j';
- altname[len-2] = 'p';
- altname[len-1] = 'g';
+ LoadTGA( name, pic, width, height );
+
+ // This is a hack to get around the fact that some
+ // baseq3 shaders refer to tga files where the images
+ // are actually jpgs
+ if (!*pic) {
+ // try jpg in place of tga
+ char altname[MAX_QPATH];
+ strcpy( altname, name );
+ len = strlen( altname );
+ altname[len-3] = 'j';
+ altname[len-2] = 'p';
+ altname[len-1] = 'g';
LoadJPG( altname, pic, width, height );
}
- } else if ( !Q_stricmp(name+len-4, ".pcx") ) {
- LoadPCX32( name, pic, width, height );
- } else if ( !Q_stricmp( name+len-4, ".bmp" ) ) {
+ }
+ else if ( !Q_stricmp(name+len-4, ".pcx") )
+ {
+ LoadPCX32( name, pic, width, height );
+ }
+ else if ( !Q_stricmp( name+len-4, ".bmp" ) )
+ {
LoadBMP( name, pic, width, height );
- } else if ( !Q_stricmp( name+len-4, ".jpg" ) ) {
+ }
+ else if ( !Q_stricmp( name+len-4, ".jpg" ) )
+ {
LoadJPG( name, pic, width, height );
}
+ else if ( !Q_stricmp( name+len-4, ".png" ) )
+ {
+ LoadPNG( name, pic, width, height );
+ }
}
@@ -2023,7 +4485,7 @@ image_t *R_FindImageFile( const char *name, qboolean mipmap, qboolean allowPicmi
altname[len-3] = toupper(altname[len-3]); // and try upper case extension for unix systems
altname[len-2] = toupper(altname[len-2]); //
altname[len-1] = toupper(altname[len-1]); //
- ri.Printf( PRINT_ALL, "trying %s...\n", altname ); //
+ ri.Printf( PRINT_DEVELOPER, "trying %s...\n", altname ); //
R_LoadImage( altname, &pic, &width, &height ); //
if (pic == NULL) { // if that fails
return NULL; // bail
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 20:18:53 +0000