mirror of
https://github.com/zint/zint
synced 2024-11-16 20:57:25 +13:00
GIF palette optimization added.
This commit is contained in:
Harald Oehlmann
parent
22570f6c73
commit
d99bda9385
374
backend/gif.c
374
backend/gif.c
@ -47,10 +47,8 @@
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/* Index of transparent color, -1 for no transparent color
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* This might be set into a variable if transparency is activated as an option
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*/
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#define TRANSPARENT_INDEX (15)
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#define TRANSPARENT_INDEX (-1)
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/* Used bit depth: 10 value pallet is 4 bit */
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#define DESTINATION_IMAGE_BITS 4
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#include <stdlib.h>
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typedef struct s_statestruct {
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@ -67,28 +65,24 @@ typedef struct s_statestruct {
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unsigned short NodeAxon[4096];
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unsigned short NodeNext[4096];
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unsigned char NodePix[4096];
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unsigned char colourCode[10];
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unsigned char colourPaletteIndex[10];
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} statestruct;
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/* Transform a Pixel to a lzw colourmap index.
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* See the 16 entries colour map definition in the code at the end for the mapping
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/* Transform a Pixel to a lzw colourmap index and move to next pixel.
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* All colour values are listed in colourCode with corresponding palette index
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*/
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static unsigned char PixelToCode(unsigned char PixelValue)
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static unsigned char NextPaletteIndex(statestruct *pState)
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{
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unsigned char pixelColour;
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int colourIndex;
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pixelColour = *(pState->pIn);
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(pState->pIn)++;
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(pState->InLen)--;
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for (colourIndex = 0;; colourIndex++) {
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if (pixelColour == pState->colourCode[colourIndex])
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return pState->colourPaletteIndex[colourIndex];
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switch (PixelValue)
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{
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case '0': return 0; /* standard background */
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case '1': return 1; /* standard foreground */
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case 'W': return 2; /* white */
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case 'C': return 3; /* cyan */
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case 'B': return 4; /* blue */
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case 'M': return 5; /* magenta */
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case 'R': return 6; /* red */
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case 'Y': return 7; /* yellow */
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case 'G': return 8; /* green */
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case 'K': return 9; /* black */
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case 'T': return 15; /* transparent */
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default: return 15; /* error case - return */
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}
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}
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@ -109,6 +103,7 @@ static char BufferNextByte(statestruct *pState) {
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}
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if (pState->OutPosCur >= pState->OutLength)
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return 1;
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(pState->pOut)[pState->OutPosCur] = 0x00;
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return 0;
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}
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@ -168,18 +163,14 @@ static char NextCode(statestruct *pState, unsigned char * pPixelValueCur, unsign
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if ((pState->InLen) == 0)
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return AddCodeToBuffer(pState, UpNode, CodeBits);
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*pPixelValueCur = PixelToCode(*(pState->pIn));
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(pState->pIn)++;
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(pState->InLen)--;
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*pPixelValueCur = NextPaletteIndex(pState);
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/* Follow the string table and the data stream to the end of the longest string that has a code */
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while (0 != (DownNode = FindPixelOutlet(pState, UpNode, *pPixelValueCur))) {
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UpNode = DownNode;
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if ((pState->InLen) == 0)
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return AddCodeToBuffer(pState, UpNode, CodeBits);
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*pPixelValueCur = PixelToCode(*(pState->pIn));
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(pState->pIn)++;
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(pState->InLen)--;
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*pPixelValueCur = NextPaletteIndex(pState);
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}
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/* Submit 'UpNode' which is the code of the longest string */
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if (AddCodeToBuffer(pState, UpNode, CodeBits))
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@ -201,95 +192,115 @@ static char NextCode(statestruct *pState, unsigned char * pPixelValueCur, unsign
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return 1;
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}
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static int gif_lzw(unsigned char *pOut, int OutLength, unsigned char *pIn, int InLen) {
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static int gif_lzw(statestruct *pState, int paletteBitSize) {
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unsigned char PixelValueCur;
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unsigned char CodeBits;
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unsigned short Pos;
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statestruct State;
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State.pIn = pIn;
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State.InLen = InLen;
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State.pOut = pOut;
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State.OutLength = OutLength;
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// > Get first data byte
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if (State.InLen == 0)
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if (pState->InLen == 0)
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return 0;
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PixelValueCur = NextPaletteIndex(pState);
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/* Number of bits per data item (=pixel)
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* We need at least a value of 2, otherwise the cc and eoi code consumes
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* the whole string table
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*/
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if (paletteBitSize == 1)
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paletteBitSize = 2;
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/* initial size of compression codes */
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CodeBits = paletteBitSize+1;
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pState->ClearCode = (1 << paletteBitSize);
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pState->FreeCode = pState->ClearCode+2;
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pState->OutBitsFree = 8;
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pState->OutPosCur = -1;
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pState->fByteCountByteSet = 0;
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if (BufferNextByte(pState))
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return 0;
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PixelValueCur = PixelToCode(*(State.pIn));
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(State.pIn)++;
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(State.InLen)--;
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CodeBits = DESTINATION_IMAGE_BITS+1;
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State.ClearCode = (1 << DESTINATION_IMAGE_BITS);
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State.FreeCode = State.ClearCode+2;
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State.OutBitsFree = 8;
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State.OutPosCur = -1;
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State.fByteCountByteSet = 0;
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for (Pos = 0; Pos < pState->ClearCode; Pos++)
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(pState->NodePix)[Pos] = (unsigned char) Pos;
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if (BufferNextByte(&State))
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return 0;
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for (Pos = 0; Pos < State.ClearCode; Pos++)
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State.NodePix[Pos] = (unsigned char) Pos;
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FlushStringTable(&State);
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FlushStringTable(pState);
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/* Write what the GIF specification calls the "code size". */
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(State.pOut)[State.OutPosCur] = DESTINATION_IMAGE_BITS;
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(pState->pOut)[pState->OutPosCur] = paletteBitSize;
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/* Reserve first bytecount byte */
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if (BufferNextByte(&State))
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if (BufferNextByte(pState))
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return 0;
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State.OutByteCountPos = State.OutPosCur;
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if (BufferNextByte(&State))
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pState->OutByteCountPos = pState->OutPosCur;
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if (BufferNextByte(pState))
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return 0;
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State.fByteCountByteSet = 1;
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pState->fByteCountByteSet = 1;
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/* Submit one 'ClearCode' as the first code */
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if (AddCodeToBuffer(&State, State.ClearCode, CodeBits))
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if (AddCodeToBuffer(pState, pState->ClearCode, CodeBits))
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return 0;
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for (;;) {
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char Res;
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/* generate and save the next code, which may consist of multiple input pixels. */
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Res = NextCode(&State, &PixelValueCur, CodeBits);
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Res = NextCode(pState, &PixelValueCur, CodeBits);
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if (Res < 0)
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return 0;
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//* Check for end of data stream */
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if (!Res) {
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/* submit 'eoi' as the last item of the code stream */
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if (AddCodeToBuffer(&State, (unsigned short) (State.ClearCode + 1), CodeBits))
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if (AddCodeToBuffer(pState, (unsigned short) (pState->ClearCode + 1), CodeBits))
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return 0;
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State.fByteCountByteSet = 0;
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if (State.OutBitsFree < 8) {
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if (BufferNextByte(&State))
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pState->fByteCountByteSet = 0;
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if (pState->OutBitsFree < 8) {
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if (BufferNextByte(pState))
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return 0;
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}
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// > Update last bytecount byte;
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if (State.OutByteCountPos < State.OutPosCur) {
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(State.pOut)[State.OutByteCountPos] = (unsigned char) (State.OutPosCur - State.OutByteCountPos - 1);
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if (pState->OutByteCountPos < pState->OutPosCur) {
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(pState->pOut)[pState->OutByteCountPos] = (unsigned char) (pState->OutPosCur - pState->OutByteCountPos - 1);
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}
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State.OutPosCur++;
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return State.OutPosCur;
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pState->OutPosCur++;
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return pState->OutPosCur;
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}
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/* Check for currently last code */
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if (State.FreeCode == (1U << CodeBits))
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if (pState->FreeCode == (1U << CodeBits))
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CodeBits++;
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State.FreeCode++;
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pState->FreeCode++;
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/* Check for full stringtable */
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if (State.FreeCode == 0xfff) {
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FlushStringTable(&State);
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if (AddCodeToBuffer(&State, State.ClearCode, CodeBits))
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if (pState->FreeCode == 0xfff) {
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FlushStringTable(pState);
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if (AddCodeToBuffer(pState, pState->ClearCode, CodeBits))
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return 0;
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CodeBits = (unsigned char) (1 + DESTINATION_IMAGE_BITS);
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State.FreeCode = (unsigned short) (State.ClearCode + 2);
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CodeBits = (unsigned char) (1 + paletteBitSize);
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pState->FreeCode = (unsigned short) (pState->ClearCode + 2);
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}
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}
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}
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/*
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* Called function to save in gif format
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*/
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INTERNAL int gif_pixel_plot(struct zint_symbol *symbol, char *pixelbuf) {
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unsigned char outbuf[10];
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FILE *gif_file;
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unsigned short usTemp;
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int byte_out;
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int colourCount;
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unsigned char paletteRGB[10][3];
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int paletteCount, paletteCountCur, paletteIndex;
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int pixelIndex;
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int paletteBitSize;
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int paletteSize;
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statestruct State;
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unsigned char backgroundColourIndex;
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unsigned char RGBCur[3];
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int colourIndex;
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int fFound;
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unsigned char pixelColour;
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#ifdef _MSC_VER
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char * lzwoutbuf;
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#endif
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@ -315,18 +326,145 @@ INTERNAL int gif_pixel_plot(struct zint_symbol *symbol, char *pixelbuf) {
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return ZINT_ERROR_FILE_ACCESS;
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}
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}
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/*ImageWidth = 2;
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ImageHeight = 2;
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rotated_bitmap[0] = 1;
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rotated_bitmap[1] = 1;
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rotated_bitmap[2] = 0;
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rotated_bitmap[3] = 0;
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/*
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* Build a table of the used palette items.
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* Currently, there are the following 10 colour codes:
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* '0': standard background
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* '1': standard foreground
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* 'W': white
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* 'C': cyan
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* 'B': blue
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* 'M': magenta
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* 'R': red
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* 'Y': yellow
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* 'G': green
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* 'K': black
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* '0' and '1' may be identical to one of the other values
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*
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* A data structure is set up as follows:
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* state.colourCode: list of colour codes
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* paletteIndex: palette index of the corresponding colour code
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* There are colourCount entries in the upper lists.
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* paletteRGB: RGB value at the palette position
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* There are paletteCount entries.
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* This value is smaller to colourCount, if multiple colour codes have the
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* same RGB value and point to the same palette value.
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* Example:
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* 0 1 W K are present. 0 is equal to white, while 1 is blue
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* The resulting tables are:
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* paletteItem: ['0']=0 (white), ['1']=1 (blue), ['W']=0 (white),
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* ['K']=2 (black)
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* Thus, there are 4 colour codes and 3 palette entries.
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*/
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colourCount = 0;
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paletteCount = 0;
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/* loop over all pixels */
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for ( pixelIndex = 0; pixelIndex < (symbol->bitmap_height * symbol->bitmap_width); pixelIndex++)
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{
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fFound = 0;
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/* get pixel colour code */
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pixelColour = pixelbuf[pixelIndex];
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/* look, if colour code is already in colour list */
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for (colourIndex = 0; colourIndex < colourCount; colourIndex++) {
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if ((State.colourCode)[colourIndex] == pixelColour) {
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fFound = 1;
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break;
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}
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}
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/* If colour is already present, go to next colour code */
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if (fFound)
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continue;
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/* Colour code not present - add colour code */
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/* Get RGB value */
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switch (pixelColour) {
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case '0': /* standard background */
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RGBCur[0] = (unsigned char) (16 * ctoi(symbol->bgcolour[0])) + ctoi(symbol->bgcolour[1]);
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RGBCur[1] = (unsigned char) (16 * ctoi(symbol->bgcolour[2])) + ctoi(symbol->bgcolour[3]);
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RGBCur[2] = (unsigned char) (16 * ctoi(symbol->bgcolour[4])) + ctoi(symbol->bgcolour[5]);
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break;
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case '1': /* standard foreground */
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RGBCur[0] = (unsigned char) (16 * ctoi(symbol->fgcolour[0])) + ctoi(symbol->fgcolour[1]);
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RGBCur[1] = (unsigned char) (16 * ctoi(symbol->fgcolour[2])) + ctoi(symbol->fgcolour[3]);
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RGBCur[2] = (unsigned char) (16 * ctoi(symbol->fgcolour[4])) + ctoi(symbol->fgcolour[5]);
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break;
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case 'W': /* white */
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RGBCur[0] = 255; RGBCur[1] = 255; RGBCur[2] = 255;
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break;
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case 'C': /* cyan */
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RGBCur[0] = 0; RGBCur[1] = 255; RGBCur[2] = 255;
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break;
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case 'B': /* blue */
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RGBCur[0] = 0; RGBCur[1] = 0; RGBCur[2] = 255;
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break;
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case 'M': /* magenta */
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RGBCur[0] = 255; RGBCur[1] = 0; RGBCur[2] = 255;
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break;
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case 'R': /* red */
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RGBCur[0] = 255; RGBCur[1] = 0; RGBCur[2] = 0;
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break;
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case 'Y': /* yellow */
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RGBCur[0] = 255; RGBCur[1] = 255; RGBCur[2] = 0;
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break;
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case 'G': /* green */
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RGBCur[0] = 0; RGBCur[1] = 255; RGBCur[2] = 0;
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break;
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case 'K': /* black */
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RGBCur[0] = 0; RGBCur[1] = 0; RGBCur[2] = 0;
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break;
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default: /* error case - return */
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strcpy(symbol->errtxt, "611: unknown pixel colour");
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return ZINT_ERROR_INVALID_DATA;
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}
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/* Search, if RGB value is already present */
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fFound = 0;
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for (paletteIndex = 0; paletteIndex < paletteCount; paletteIndex++) {
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if (RGBCur[0] == paletteRGB[paletteIndex][0]
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&& RGBCur[1] == paletteRGB[paletteIndex][1]
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&& RGBCur[2] == paletteRGB[paletteIndex][2])
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{
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fFound = 1;
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break;
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}
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}
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/* RGB not present, add it */
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if (!fFound) {
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paletteIndex = paletteCount;
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paletteRGB[paletteIndex][0] = RGBCur[0];
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paletteRGB[paletteIndex][1] = RGBCur[1];
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paletteRGB[paletteIndex][2] = RGBCur[2];
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paletteCount++;
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}
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/* Add palette index to current colour code */
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(State.colourCode)[colourCount] = pixelColour;
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(State.colourPaletteIndex)[colourCount] = paletteIndex;
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colourCount++;
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}
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/* find palette bit size from palette size*/
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/* 1,2 -> 1, 3,4 ->2, 5,6,7,8->3 */
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paletteBitSize = 0;
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paletteCountCur = paletteCount-1;
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while (paletteCountCur != 0) {
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paletteBitSize++;
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paletteCountCur >>= 1;
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}
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/* Minimum is 1 */
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if (paletteBitSize == 0)
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paletteBitSize = 1;
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/* palette size 2 ^ bit size */
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paletteSize = 1<<paletteBitSize;
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/* GIF signature (6) */
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memcpy(outbuf, "GIF87a", 6);
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if (TRANSPARENT_INDEX != -1)
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outbuf[4] = '9';
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fwrite(outbuf, 6, 1, gif_file);
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/* Screen Descriptor (7) */
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/* Screen Width */
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@ -343,57 +481,33 @@ INTERNAL int gif_pixel_plot(struct zint_symbol *symbol, char *pixelbuf) {
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* 1 : Global colour map
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* 111 : 8 bit colour depth of the palette
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* 0 : Not ordered in decreasing importance
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* 011 : 4 bit palette
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* xxx : palette bit zize - 1
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*/
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outbuf[4] = (unsigned char) (0xf0 | (0x7 & (DESTINATION_IMAGE_BITS - 1)));
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/* Background color = colortable index 0 */
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outbuf[5] = 0x00;
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outbuf[4] = (unsigned char) (0xf0 | (0x7 & (paletteBitSize - 1)));
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/*
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* Background colour index
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* Default to 0. If colour code 0 or K is present, it is used as index
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*/
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backgroundColourIndex = 0;
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for (colourIndex = 0; colourIndex < colourCount; colourIndex++) {
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if ((State.colourCode)[colourIndex] == '0' || (State.colourCode)[colourIndex] == 'W') {
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backgroundColourIndex = (State.colourPaletteIndex)[colourIndex];
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break;
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}
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}
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outbuf[5] = backgroundColourIndex;
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/* Byte 7 must be 0x00 */
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outbuf[6] = 0x00;
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fwrite(outbuf, 7, 1, gif_file);
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/* Global Color Table (16*3) */
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/* Colour index 0: RGB 0 color */
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outbuf[0] = (unsigned char) (16 * ctoi(symbol->bgcolour[0])) + ctoi(symbol->bgcolour[1]);
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outbuf[1] = (unsigned char) (16 * ctoi(symbol->bgcolour[2])) + ctoi(symbol->bgcolour[3]);
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outbuf[2] = (unsigned char) (16 * ctoi(symbol->bgcolour[4])) + ctoi(symbol->bgcolour[5]);
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/* Colour index 1: RGB 1 color */
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outbuf[3] = (unsigned char) (16 * ctoi(symbol->fgcolour[0])) + ctoi(symbol->fgcolour[1]);
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outbuf[4] = (unsigned char) (16 * ctoi(symbol->fgcolour[2])) + ctoi(symbol->fgcolour[3]);
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outbuf[5] = (unsigned char) (16 * ctoi(symbol->fgcolour[4])) + ctoi(symbol->fgcolour[5]);
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/* Colour index 2: "W" for White color */
|
||||
outbuf[6] = 255; outbuf[7] = 255; outbuf[8] = 255;
|
||||
fwrite(outbuf, 9, 1, gif_file);
|
||||
/* Colour index 3: "C" for Cyan colour */
|
||||
outbuf[0] = 0; outbuf[1] = 255; outbuf[2] = 255;
|
||||
/* Colour index 4: "B" for Blue colour */
|
||||
outbuf[3] = 0; outbuf[4] = 0; outbuf[5] = 255;
|
||||
/* Colour index 5: "M" for Magenta colour */
|
||||
outbuf[6] = 255; outbuf[7] = 0; outbuf[8] = 255;
|
||||
fwrite(outbuf, 9, 1, gif_file);
|
||||
/* Colour index 6: "R" for red colour */
|
||||
outbuf[0] = 255; outbuf[1] = 0; outbuf[2] = 0;
|
||||
/* Colour index 7: "Y" for yellow colour */
|
||||
outbuf[3] = 255; outbuf[4] = 255; outbuf[5] = 0;
|
||||
/* Colour index 8: "G" for green colour */
|
||||
outbuf[6] = 0; outbuf[7] = 255; outbuf[8] = 0;
|
||||
fwrite(outbuf, 9, 1, gif_file);
|
||||
/* Colour index 9: "K" for black colour */
|
||||
outbuf[0] = 0; outbuf[1] = 0; outbuf[2] = 0;
|
||||
/* Colour index 10: unused, set to black colour*/
|
||||
outbuf[3] = 0; outbuf[4] = 0; outbuf[5] = 0;
|
||||
/* Colour index 11: unused, set to black colour */
|
||||
outbuf[6] = 0; outbuf[7] = 0; outbuf[8] = 0;
|
||||
fwrite(outbuf, 9, 1, gif_file);
|
||||
/* Colour index 12: unused, set to black colour */
|
||||
outbuf[0] = 0; outbuf[1] = 0; outbuf[2] = 0;
|
||||
/* Colour index 13: unused, set to black colour*/
|
||||
outbuf[3] = 0; outbuf[4] = 0; outbuf[5] = 0;
|
||||
/* Colour index 14: unused, set to black colour */
|
||||
outbuf[6] = 0; outbuf[7] = 0; outbuf[8] = 0;
|
||||
fwrite(outbuf, 9, 1, gif_file);
|
||||
/* Colour index 15: transparent colour */
|
||||
outbuf[0] = 0; outbuf[1] = 0; outbuf[2] = 0;
|
||||
fwrite(outbuf, 3, 1, gif_file);
|
||||
/* Global Color Table (paletteSize*3) */
|
||||
fwrite(paletteRGB, 3*paletteCount, 1, gif_file);
|
||||
/* add unused palette items to fill palette size */
|
||||
for (paletteIndex = paletteCount; paletteIndex < paletteSize; paletteIndex++) {
|
||||
unsigned char RGBCur[3] = {0,0,0};
|
||||
fwrite(RGBCur, 3, 1, gif_file);
|
||||
}
|
||||
|
||||
/* Graphic control extension (8) */
|
||||
/* A graphic control extension block is used for overlay gifs.
|
||||
@ -445,12 +559,14 @@ INTERNAL int gif_pixel_plot(struct zint_symbol *symbol, char *pixelbuf) {
|
||||
outbuf[9] = 0x00;
|
||||
fwrite(outbuf, 10, 1, gif_file);
|
||||
|
||||
/* prepare state array */
|
||||
State.pIn = (unsigned char *) pixelbuf;
|
||||
State.InLen = symbol->bitmap_height * symbol->bitmap_width;
|
||||
State.pOut = (unsigned char *) lzwoutbuf;
|
||||
State.OutLength = symbol->bitmap_height * symbol->bitmap_width;
|
||||
|
||||
/* call lzw encoding */
|
||||
byte_out = gif_lzw(
|
||||
(unsigned char *) lzwoutbuf,
|
||||
symbol->bitmap_height * symbol->bitmap_width,
|
||||
(unsigned char *) pixelbuf,
|
||||
symbol->bitmap_height * symbol->bitmap_width);
|
||||
byte_out = gif_lzw(&State, paletteBitSize);
|
||||
if (byte_out <= 0) {
|
||||
fclose(gif_file);
|
||||
return ZINT_ERROR_MEMORY;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user