ref: a557c515c8c9c01fdb4f6cc850665be05accd84c
dir: /sys/src/cmd/aux/antiword/dib2sprt.c/
/*
* dib2sprt.c
* Copyright (C) 2000-2003 A.J. van Os; Released under GPL
*
* Description:
* Functions to translate dib pictures into sprites
*/
#include <stdio.h>
#include <string.h>
#include "DeskLib:Error.h"
#include "DeskLib:Sprite.h"
#include "antiword.h"
#if 0 /* defined(DEBUG) */
static int iPicCounter = 0;
#endif /* DEBUG */
/*
* iGetByteWidth - compute the number of bytes needed for a row of pixels
*/
static int
iGetByteWidth(const imagedata_type *pImg)
{
switch (pImg->uiBitsPerComponent) {
case 1:
return (pImg->iWidth + 31) / 32 * sizeof(int);
case 4:
return (pImg->iWidth + 7) / 8 * sizeof(int);
case 8:
case 24:
return (pImg->iWidth + 3) / 4 * sizeof(int);
default:
DBG_DEC(pImg->uiBitsPerComponent);
return 0;
}
} /* end of iGetByteWidth */
/*
* pCreateBlankSprite - Create a blank sprite.
*
* Create a blank sprite and add a palette if needed
*
* returns a pointer to the sprite when successful, otherwise NULL
*/
static sprite_areainfo *
pCreateBlankSprite(const imagedata_type *pImg, size_t *pSize)
{
sprite_areainfo *pArea;
UCHAR *pucTmp;
size_t tSize;
screen_modeval uMode;
int iIndex, iPaletteEntries;
TRACE_MSG("pCreateBlankSprite");
fail(pImg == NULL);
fail(pSize == NULL);
switch (pImg->uiBitsPerComponent) {
case 1:
uMode.screen_mode = 18;
iPaletteEntries = 2;
break;
case 4:
uMode.screen_mode = 20;
iPaletteEntries = 16;
break;
case 8:
case 24:
uMode.screen_mode = 21;
iPaletteEntries = 0;
break;
default:
DBG_DEC(pImg->uiBitsPerComponent);
return NULL;
}
fail(iPaletteEntries < 0 || iPaletteEntries > 16);
/* Get memory for the sprite */
tSize = sizeof(sprite_areainfo) +
Sprite_MemorySize(pImg->iWidth, pImg->iHeight, uMode,
iPaletteEntries > 0 ? sprite_HASPAL : sprite_HASNOMASKPAL);
DBG_DEC(tSize);
pArea = xmalloc(tSize);
/* Initialise sprite area */
pArea->areasize = tSize;
pArea->numsprites = 0;
pArea->firstoffset = sizeof(sprite_areainfo);
pArea->freeoffset = sizeof(sprite_areainfo);
/* Create a blank sprite */
Error_CheckFatal(Sprite_Create(pArea, "wordimage",
iPaletteEntries > 0 ? 1 : 0,
pImg->iWidth, pImg->iHeight, uMode));
/* Add the palette */
pucTmp = (UCHAR *)pArea + pArea->firstoffset + sizeof(sprite_header);
for (iIndex = 0; iIndex < iPaletteEntries; iIndex++) {
/* First color */
*pucTmp++ = 0;
*pucTmp++ = pImg->aucPalette[iIndex][0];
*pucTmp++ = pImg->aucPalette[iIndex][1];
*pucTmp++ = pImg->aucPalette[iIndex][2];
/* Second color */
*pucTmp++ = 0;
*pucTmp++ = pImg->aucPalette[iIndex][0];
*pucTmp++ = pImg->aucPalette[iIndex][1];
*pucTmp++ = pImg->aucPalette[iIndex][2];
}
*pSize = tSize;
return pArea;
} /* end of pCreateBlankSprite */
/*
* iReduceColor - reduce from 24 bit to 8 bit color
*
* Reduce 24 bit true colors to RISC OS default 256 color palette
*
* returns the resulting color
*/
static int
iReduceColor(int iRed, int iGreen, int iBlue)
{
int iResult;
iResult = (iBlue & 0x80) ? 0x80 : 0;
iResult |= (iGreen & 0x80) ? 0x40 : 0;
iResult |= (iGreen & 0x40) ? 0x20 : 0;
iResult |= (iRed & 0x80) ? 0x10 : 0;
iResult |= (iBlue & 0x40) ? 0x08 : 0;
iResult |= (iRed & 0x40) ? 0x04 : 0;
iResult |= ((iRed | iGreen | iBlue) & 0x20) ? 0x02 : 0;
iResult |= ((iRed | iGreen | iBlue) & 0x10) ? 0x01 : 0;
return iResult;
} /* end of iReduceColor */
/*
* vDecode1bpp - decode an uncompressed 1 bit per pixel image
*/
static void
vDecode1bpp(FILE *pFile, UCHAR *pucData, const imagedata_type *pImg)
{
int iX, iY, iByteWidth, iOffset, iTmp, iEighthWidth, iPadding;
UCHAR ucTmp;
DBG_MSG("vDecode1bpp");
fail(pFile == NULL);
fail(pucData == NULL);
fail(pImg == NULL);
fail(pImg->iColorsUsed < 1 || pImg->iColorsUsed > 2);
iByteWidth = iGetByteWidth(pImg);
iEighthWidth = (pImg->iWidth + 7) / 8;
iPadding = ROUND4(iEighthWidth) - iEighthWidth;
for (iY = pImg->iHeight - 1; iY >= 0; iY--) {
for (iX = 0; iX < iEighthWidth; iX++) {
iTmp = iNextByte(pFile);
if (iTmp == EOF) {
return;
}
/* Reverse the bit order */
ucTmp = (iTmp & BIT(0)) ? (UCHAR)BIT(7) : 0;
ucTmp |= (iTmp & BIT(1)) ? (UCHAR)BIT(6) : 0;
ucTmp |= (iTmp & BIT(2)) ? (UCHAR)BIT(5) : 0;
ucTmp |= (iTmp & BIT(3)) ? (UCHAR)BIT(4) : 0;
ucTmp |= (iTmp & BIT(4)) ? (UCHAR)BIT(3) : 0;
ucTmp |= (iTmp & BIT(5)) ? (UCHAR)BIT(2) : 0;
ucTmp |= (iTmp & BIT(6)) ? (UCHAR)BIT(1) : 0;
ucTmp |= (iTmp & BIT(7)) ? (UCHAR)BIT(0) : 0;
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) = ucTmp;
}
(void)tSkipBytes(pFile, iPadding);
}
} /* end of vDecode1bpp */
/*
* vDecode4bpp - decode an uncompressed 4 bits per pixel image
*/
static void
vDecode4bpp(FILE *pFile, UCHAR *pucData, const imagedata_type *pImg)
{
int iX, iY, iByteWidth, iOffset, iTmp, iHalfWidth, iPadding;
UCHAR ucTmp;
DBG_MSG("vDecode4bpp");
fail(pFile == NULL);
fail(pucData == NULL);
fail(pImg == NULL);
fail(pImg->iColorsUsed < 1 || pImg->iColorsUsed > 16);
iByteWidth = iGetByteWidth(pImg);
iHalfWidth = (pImg->iWidth + 1) / 2;
iPadding = ROUND4(iHalfWidth) - iHalfWidth;
for (iY = pImg->iHeight - 1; iY >= 0; iY--) {
for (iX = 0; iX < iHalfWidth; iX++) {
iTmp = iNextByte(pFile);
if (iTmp == EOF) {
return;
}
/* Reverse the nibble order */
ucTmp = (iTmp & 0xf0) >> 4;
ucTmp |= (iTmp & 0x0f) << 4;
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) = ucTmp;
}
(void)tSkipBytes(pFile, iPadding);
}
} /* end of vDecode4bpp */
/*
* vDecode8bpp - decode an uncompressed 8 bits per pixel image
*/
static void
vDecode8bpp(FILE *pFile, UCHAR *pucData, const imagedata_type *pImg)
{
int iX, iY, iByteWidth, iOffset, iIndex, iPadding;
DBG_MSG("vDecode8bpp");
fail(pFile == NULL);
fail(pucData == NULL);
fail(pImg == NULL);
fail(pImg->iColorsUsed < 1 || pImg->iColorsUsed > 256);
iByteWidth = iGetByteWidth(pImg);
iPadding = ROUND4(pImg->iWidth) - pImg->iWidth;
for (iY = pImg->iHeight - 1; iY >= 0; iY--) {
for (iX = 0; iX < pImg->iWidth; iX++) {
iIndex = iNextByte(pFile);
if (iIndex == EOF) {
return;
}
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) = iReduceColor(
pImg->aucPalette[iIndex][0],
pImg->aucPalette[iIndex][1],
pImg->aucPalette[iIndex][2]);
}
(void)tSkipBytes(pFile, iPadding);
}
} /* end of vDecode8bpp */
/*
* vDecode24bpp - decode an uncompressed 24 bits per pixel image
*/
static void
vDecode24bpp(FILE *pFile, UCHAR *pucData, const imagedata_type *pImg)
{
int iX, iY, iTripleWidth, iByteWidth, iOffset, iPadding;
int iRed, iGreen, iBlue;
DBG_MSG("vDecode24bpp");
fail(pFile == NULL);
fail(pucData == NULL);
fail(pImg == NULL);
iByteWidth = iGetByteWidth(pImg);
iTripleWidth = pImg->iWidth * 3;
iPadding = ROUND4(iTripleWidth) - iTripleWidth;
for (iY = pImg->iHeight - 1; iY >= 0; iY--) {
for (iX = 0; iX < pImg->iWidth; iX++) {
iBlue = iNextByte(pFile);
if (iBlue == EOF) {
return;
}
iGreen = iNextByte(pFile);
if (iGreen == EOF) {
return;
}
iRed = iNextByte(pFile);
if (iRed == EOF) {
return;
}
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) =
iReduceColor(iRed, iGreen, iBlue);
}
(void)tSkipBytes(pFile, iPadding);
}
} /* end of vDecode24bpp */
/*
* vDecodeRle4 - decode a RLE compressed 4 bits per pixel image
*/
static void
vDecodeRle4(FILE *pFile, UCHAR *pucData, const imagedata_type *pImg)
{
int iX, iY, iByteWidth, iOffset, iTmp, iHalfWidth;
int iRun, iRunLength, iHalfRun;
BOOL bEOL;
UCHAR ucTmp;
DBG_MSG("vDecodeRle4");
fail(pFile == NULL);
fail(pucData == NULL);
fail(pImg == NULL);
fail(pImg->iColorsUsed < 1 || pImg->iColorsUsed > 16);
DBG_DEC(pImg->iWidth);
DBG_DEC(pImg->iHeight);
iByteWidth = iGetByteWidth(pImg);
iHalfWidth = (pImg->iWidth + 1) / 2;
for (iY = pImg->iHeight - 1; iY >= 0; iY--) {
bEOL = FALSE;
iX = 0;
while (!bEOL) {
iRunLength = iNextByte(pFile);
if (iRunLength == EOF) {
return;
}
if (iRunLength != 0) {
/*
* Encoded packet:
* RunLength pixels, all the "same" value
*/
iTmp = iNextByte(pFile);
if (iTmp == EOF) {
return;
}
/* Reverse the nibble order */
ucTmp = (iTmp & 0xf0) >> 4;
ucTmp |= (iTmp & 0x0f) << 4;
iHalfRun = (iRunLength + 1) / 2;
for (iRun = 0; iRun < iHalfRun; iRun++) {
if (iX < iHalfWidth) {
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) = ucTmp;
}
iX++;
}
continue;
}
/* Literal or escape */
iRunLength = iNextByte(pFile);
if (iRunLength == EOF) {
return;
}
if (iRunLength == 0) { /* End of line escape */
bEOL = TRUE;
} else if (iRunLength == 1) { /* End of file escape */
return;
} else if (iRunLength == 2) { /* Delta escape */
DBG_MSG("RLE4: encountered delta escape");
return;
} else { /* Literal packet */
iHalfRun = (iRunLength + 1) / 2;
for (iRun = 0; iRun < iHalfRun; iRun++) {
iTmp = iNextByte(pFile);
if (iTmp == EOF) {
return;
}
/* Reverse the nibble order */
ucTmp = (iTmp & 0xf0) >> 4;
ucTmp |= (iTmp & 0x0f) << 4;
if (iX < iHalfWidth) {
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) = ucTmp;
}
iX++;
}
/* Padding if the number of bytes is odd */
if (odd(iHalfRun)) {
(void)tSkipBytes(pFile, 1);
}
}
}
DBG_DEC_C(iX != iHalfWidth, iX);
}
} /* end of vDecodeRle4 */
/*
* vDecodeRle8 - decode a RLE compressed 8 bits per pixel image
*/
static void
vDecodeRle8(FILE *pFile, UCHAR *pucData, const imagedata_type *pImg)
{
int iX, iY, iRun, iRunLength, iOffset, iIndex, iByteWidth;
BOOL bEOL;
DBG_MSG("vDecodeRle8");
fail(pFile == NULL);
fail(pucData == NULL);
fail(pImg == NULL);
fail(pImg->iColorsUsed < 1 || pImg->iColorsUsed > 256);
DBG_DEC(pImg->iWidth);
DBG_DEC(pImg->iHeight);
iByteWidth = iGetByteWidth(pImg);
for (iY = pImg->iHeight - 1; iY >= 0; iY--) {
bEOL = FALSE;
iX = 0;
while (!bEOL) {
iRunLength = iNextByte(pFile);
if (iRunLength == EOF) {
return;
}
if (iRunLength != 0) {
/*
* Encoded packet:
* RunLength pixels, all the same value
*/
iIndex = iNextByte(pFile);
if (iIndex == EOF) {
return;
}
for (iRun = 0; iRun < iRunLength; iRun++) {
if (iX < pImg->iWidth) {
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) =
iReduceColor(
pImg->aucPalette[iIndex][0],
pImg->aucPalette[iIndex][1],
pImg->aucPalette[iIndex][2]);
}
iX++;
}
continue;
}
/* Literal or escape */
iRunLength = iNextByte(pFile);
if (iRunLength == EOF) {
return;
}
if (iRunLength == 0) { /* End of line escape */
bEOL = TRUE;
} else if (iRunLength == 1) { /* End of file escape */
return;
} else if (iRunLength == 2) { /* Delta escape */
DBG_MSG("RLE8: encountered delta escape");
return;
} else { /* Literal packet */
for (iRun = 0; iRun < iRunLength; iRun++) {
iIndex = iNextByte(pFile);
if (iIndex == EOF) {
return;
}
if (iX < pImg->iWidth) {
iOffset = iY * iByteWidth + iX;
*(pucData + iOffset) =
iReduceColor(
pImg->aucPalette[iIndex][0],
pImg->aucPalette[iIndex][1],
pImg->aucPalette[iIndex][2]);
}
iX++;
}
/* Padding if the number of bytes is odd */
if (odd(iRunLength)) {
(void)tSkipBytes(pFile, 1);
}
}
}
DBG_DEC_C(iX != pImg->iWidth, iX);
}
} /* end of vDecodeRle8 */
#if 0 /* defined(DEBUG) */
static void
vCopy2File(UCHAR *pucSprite, size_t tSpriteSize)
{
FILE *pOutFile;
int iIndex;
char szFilename[30];
sprintf(szFilename, "<Wimp$ScrapDir>.sprt%04d", ++iPicCounter);
pOutFile = fopen(szFilename, "wb");
if (pOutFile == NULL) {
return;
}
DBG_MSG(szFilename);
for (iIndex = 4; iIndex < (int)tSpriteSize; iIndex++) {
if (putc(pucSprite[iIndex], pOutFile) == EOF) {
break;
}
}
(void)fclose(pOutFile);
vSetFiletype(szFilename, FILETYPE_SPRITE);
} /* end of vCopy2File */
#endif /* DEBUG */
/*
* vDecodeDIB - decode a dib picture
*/
static void
vDecodeDIB(diagram_type *pDiag, FILE *pFile, const imagedata_type *pImg)
{
sprite_areainfo *pSprite;
UCHAR *pucPalette, *pucData;
size_t tSpriteSize;
int iHeaderSize;
/* Skip the bitmap info header */
iHeaderSize = (int)ulNextLong(pFile);
(void)tSkipBytes(pFile, iHeaderSize - 4);
/* Skip the colortable */
if (pImg->uiBitsPerComponent <= 8) {
(void)tSkipBytes(pFile,
pImg->iColorsUsed * ((iHeaderSize > 12) ? 4 : 3));
}
/* Create an blank sprite */
pSprite = pCreateBlankSprite(pImg, &tSpriteSize);
pucPalette = (UCHAR *)pSprite +
pSprite->firstoffset + sizeof(sprite_header);
/* Add the pixel information */
switch (pImg->uiBitsPerComponent) {
case 1:
fail(pImg->eCompression != compression_none);
pucData = pucPalette + 2 * 8;
vDecode1bpp(pFile, pucData, pImg);
break;
case 4:
fail(pImg->eCompression != compression_none &&
pImg->eCompression != compression_rle4);
pucData = pucPalette + 16 * 8;
if (pImg->eCompression == compression_rle4) {
vDecodeRle4(pFile, pucData, pImg);
} else {
vDecode4bpp(pFile, pucData, pImg);
}
break;
case 8:
fail(pImg->eCompression != compression_none &&
pImg->eCompression != compression_rle8);
pucData = pucPalette + 0 * 8;
if (pImg->eCompression == compression_rle8) {
vDecodeRle8(pFile, pucData, pImg);
} else {
vDecode8bpp(pFile, pucData, pImg);
}
break;
case 24:
fail(pImg->eCompression != compression_none);
pucData = pucPalette + 0 * 8;
vDecode24bpp(pFile, pucData, pImg);
break;
default:
DBG_DEC(pImg->uiBitsPerComponent);
break;
}
#if 0 /* defined(DEBUG) */
vCopy2File((UCHAR *)pSprite, tSpriteSize);
#endif /* DEBUG */
/* Add the sprite to the Draw file */
vImage2Diagram(pDiag, pImg,
(UCHAR *)pSprite + pSprite->firstoffset,
tSpriteSize - pSprite->firstoffset);
/* Clean up before you leave */
pSprite = xfree(pSprite);
} /* end of vDecodeDIB */
/*
* bTranslateDIB - translate a DIB picture
*
* This function translates a picture from dib to sprite
*
* return TRUE when sucessful, otherwise FALSE
*/
BOOL
bTranslateDIB(diagram_type *pDiag, FILE *pFile,
ULONG ulFileOffset, const imagedata_type *pImg)
{
/* Seek to start position of DIB data */
if (!bSetDataOffset(pFile, ulFileOffset)) {
return FALSE;
}
vDecodeDIB(pDiag, pFile, pImg);
return TRUE;
} /* end of bTranslateDIB */