mirror of https://github.com/encounter/SDL.git
LoadBMP: use code from SDL_image which allows loading compressed BMP files
This commit is contained in:
Sylvain Becker
parent
cc64b369fb
commit
830979c555
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@ -54,6 +54,92 @@
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#define LCS_WINDOWS_COLOR_SPACE 0x57696E20
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#endif
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static int readRlePixels(SDL_Surface * surface, SDL_RWops * src, int isRle8)
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{
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/*
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| Sets the surface pixels from src. A bmp image is upside down.
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*/
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int pitch = surface->pitch;
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int height = surface->h;
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Uint8 *start = (Uint8 *)surface->pixels;
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Uint8 *end = start + (height*pitch);
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Uint8 *bits = end-pitch, *spot;
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int ofs = 0;
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Uint8 ch;
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Uint8 needsPad;
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#define COPY_PIXEL(x) spot = &bits[ofs++]; if(spot >= start && spot < end) *spot = (x)
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for (;;) {
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if ( !SDL_RWread(src, &ch, 1, 1) ) return 1;
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/*
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| encoded mode starts with a run length, and then a byte
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| with two colour indexes to alternate between for the run
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*/
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if ( ch ) {
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Uint8 pixel;
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if ( !SDL_RWread(src, &pixel, 1, 1) ) return 1;
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if ( isRle8 ) { /* 256-color bitmap, compressed */
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do {
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COPY_PIXEL(pixel);
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} while (--ch);
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} else { /* 16-color bitmap, compressed */
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Uint8 pixel0 = pixel >> 4;
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Uint8 pixel1 = pixel & 0x0F;
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for (;;) {
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COPY_PIXEL(pixel0); /* even count, high nibble */
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if (!--ch) break;
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COPY_PIXEL(pixel1); /* odd count, low nibble */
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if (!--ch) break;
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}
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}
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} else {
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/*
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| A leading zero is an escape; it may signal the end of the bitmap,
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| a cursor move, or some absolute data.
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| zero tag may be absolute mode or an escape
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*/
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if ( !SDL_RWread(src, &ch, 1, 1) ) return 1;
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switch (ch) {
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case 0: /* end of line */
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ofs = 0;
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bits -= pitch; /* go to previous */
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break;
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case 1: /* end of bitmap */
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return 0; /* success! */
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case 2: /* delta */
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if ( !SDL_RWread(src, &ch, 1, 1) ) return 1;
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ofs += ch;
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if ( !SDL_RWread(src, &ch, 1, 1) ) return 1;
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bits -= (ch * pitch);
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break;
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default: /* no compression */
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if (isRle8) {
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needsPad = ( ch & 1 );
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do {
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Uint8 pixel;
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if ( !SDL_RWread(src, &pixel, 1, 1) ) return 1;
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COPY_PIXEL(pixel);
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} while (--ch);
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} else {
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needsPad = ( ((ch+1)>>1) & 1 ); /* (ch+1)>>1: bytes size */
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for (;;) {
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Uint8 pixel;
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if ( !SDL_RWread(src, &pixel, 1, 1) ) return 1;
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COPY_PIXEL(pixel >> 4);
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if (!--ch) break;
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COPY_PIXEL(pixel & 0x0F);
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if (!--ch) break;
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}
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}
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/* pad at even boundary */
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if ( needsPad && !SDL_RWread(src, &ch, 1, 1) ) return 1;
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break;
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}
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}
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}
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}
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static void CorrectAlphaChannel(SDL_Surface *surface)
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{
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/* Check to see if there is any alpha channel data */
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@ -87,7 +173,7 @@ SDL_Surface *
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SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
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{
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SDL_bool was_error;
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Sint64 fp_offset = 0;
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Sint64 fp_offset;
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int bmpPitch;
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int i, pad;
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SDL_Surface *surface;
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@ -105,32 +191,29 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
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SDL_bool correctAlpha = SDL_FALSE;
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/* The Win32 BMP file header (14 bytes) */
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char magic[2];
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/* Uint32 bfSize = 0; */
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/* Uint16 bfReserved1 = 0; */
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/* Uint16 bfReserved2 = 0; */
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Uint32 bfOffBits = 0;
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char magic[2];
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Uint32 bfSize;
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Uint16 bfReserved1;
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Uint16 bfReserved2;
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Uint32 bfOffBits;
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/* The Win32 BITMAPINFOHEADER struct (40 bytes) */
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Uint32 biSize = 0;
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Sint32 biWidth = 0;
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Uint32 biSize;
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Sint32 biWidth;
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Sint32 biHeight = 0;
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/* Uint16 biPlanes = 0; */
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Uint16 biBitCount = 0;
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Uint32 biCompression = 0;
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/* Uint32 biSizeImage = 0; */
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/* Sint32 biXPelsPerMeter = 0; */
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/* Sint32 biYPelsPerMeter = 0; */
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Uint32 biClrUsed = 0;
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/* Uint32 biClrImportant = 0; */
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(void) haveRGBMasks;
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(void) haveAlphaMask;
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Uint16 biPlanes;
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Uint16 biBitCount;
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Uint32 biCompression;
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Uint32 biSizeImage;
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Sint32 biXPelsPerMeter;
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Sint32 biYPelsPerMeter;
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Uint32 biClrUsed;
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Uint32 biClrImportant;
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/* Make sure we are passed a valid data source */
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surface = NULL;
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was_error = SDL_FALSE;
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if (src == NULL) {
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if ( src == NULL ) {
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was_error = SDL_TRUE;
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goto done;
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}
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@ -138,52 +221,49 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
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/* Read in the BMP file header */
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fp_offset = SDL_RWtell(src);
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SDL_ClearError();
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if (SDL_RWread(src, magic, 1, 2) != 2) {
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if ( SDL_RWread(src, magic, 1, 2) != 2 ) {
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SDL_Error(SDL_EFREAD);
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was_error = SDL_TRUE;
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goto done;
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}
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if (SDL_strncmp(magic, "BM", 2) != 0) {
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if ( SDL_strncmp(magic, "BM", 2) != 0 ) {
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SDL_SetError("File is not a Windows BMP file");
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was_error = SDL_TRUE;
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goto done;
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}
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/* bfSize = */ SDL_ReadLE32(src);
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/* bfReserved1 = */ SDL_ReadLE16(src);
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/* bfReserved2 = */ SDL_ReadLE16(src);
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bfOffBits = SDL_ReadLE32(src);
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bfSize = SDL_ReadLE32(src);
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bfReserved1 = SDL_ReadLE16(src);
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bfReserved2 = SDL_ReadLE16(src);
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bfOffBits = SDL_ReadLE32(src);
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/* Read the Win32 BITMAPINFOHEADER */
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biSize = SDL_ReadLE32(src);
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if (biSize == 12) { /* really old BITMAPCOREHEADER */
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biWidth = (Uint32) SDL_ReadLE16(src);
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biHeight = (Uint32) SDL_ReadLE16(src);
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/* biPlanes = */ SDL_ReadLE16(src);
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biBitCount = SDL_ReadLE16(src);
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biCompression = BI_RGB;
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biSize = SDL_ReadLE32(src);
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if ( biSize == 12 ) { /* really old BITMAPCOREHEADER */
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biWidth = (Uint32)SDL_ReadLE16(src);
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biHeight = (Uint32)SDL_ReadLE16(src);
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biPlanes = SDL_ReadLE16(src);
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biBitCount = SDL_ReadLE16(src);
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biCompression = BI_RGB;
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biSizeImage = 0;
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biXPelsPerMeter = 0;
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biYPelsPerMeter = 0;
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biClrUsed = 0;
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biClrImportant = 0;
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} else if (biSize >= 40) { /* some version of BITMAPINFOHEADER */
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Uint32 headerSize;
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biWidth = SDL_ReadLE32(src);
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biHeight = SDL_ReadLE32(src);
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/* biPlanes = */ SDL_ReadLE16(src);
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biBitCount = SDL_ReadLE16(src);
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biCompression = SDL_ReadLE32(src);
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/* biSizeImage = */ SDL_ReadLE32(src);
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/* biXPelsPerMeter = */ SDL_ReadLE32(src);
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/* biYPelsPerMeter = */ SDL_ReadLE32(src);
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biClrUsed = SDL_ReadLE32(src);
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/* biClrImportant = */ SDL_ReadLE32(src);
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biWidth = SDL_ReadLE32(src);
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biHeight = SDL_ReadLE32(src);
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biPlanes = SDL_ReadLE16(src);
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biBitCount = SDL_ReadLE16(src);
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biCompression = SDL_ReadLE32(src);
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biSizeImage = SDL_ReadLE32(src);
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biXPelsPerMeter = SDL_ReadLE32(src);
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biYPelsPerMeter = SDL_ReadLE32(src);
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biClrUsed = SDL_ReadLE32(src);
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biClrImportant = SDL_ReadLE32(src);
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/* 64 == BITMAPCOREHEADER2, an incompatible OS/2 2.x extension. Skip this stuff for now. */
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if (biSize == 64) {
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/* ignore these extra fields. */
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if (biCompression == BI_BITFIELDS) {
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/* this value is actually huffman compression in this variant. */
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SDL_SetError("Compressed BMP files not supported");
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was_error = SDL_TRUE;
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goto done;
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}
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} else {
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if (biSize != 64) {
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/* This is complicated. If compression is BI_BITFIELDS, then
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we have 3 DWORDS that specify the RGB masks. This is either
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stored here in an BITMAPV2INFOHEADER (which only differs in
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@ -246,117 +326,102 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
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/* Expand 1 and 4 bit bitmaps to 8 bits per pixel */
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switch (biBitCount) {
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case 1:
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case 4:
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ExpandBMP = biBitCount;
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biBitCount = 8;
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break;
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case 2:
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case 3:
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case 5:
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case 6:
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case 7:
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SDL_SetError("%d-bpp BMP images are not supported", biBitCount);
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was_error = SDL_TRUE;
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goto done;
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default:
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ExpandBMP = 0;
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break;
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case 1:
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case 4:
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ExpandBMP = biBitCount;
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biBitCount = 8;
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break;
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case 2:
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case 3:
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case 5:
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case 6:
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case 7:
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SDL_SetError("%d-bpp BMP images are not supported", biBitCount);
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was_error = SDL_TRUE;
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goto done;
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default:
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ExpandBMP = 0;
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break;
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}
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/* We don't support any BMP compression right now */
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/* RLE4 and RLE8 BMP compression is supported */
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switch (biCompression) {
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case BI_RGB:
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/* If there are no masks, use the defaults */
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SDL_assert(!haveRGBMasks);
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SDL_assert(!haveAlphaMask);
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/* Default values for the BMP format */
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switch (biBitCount) {
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case 15:
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case 16:
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Rmask = 0x7C00;
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Gmask = 0x03E0;
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Bmask = 0x001F;
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break;
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case 24:
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case BI_RGB:
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/* If there are no masks, use the defaults */
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SDL_assert(!haveRGBMasks);
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SDL_assert(!haveAlphaMask);
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/* Default values for the BMP format */
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switch (biBitCount) {
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case 15:
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case 16:
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Rmask = 0x7C00;
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Gmask = 0x03E0;
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Bmask = 0x001F;
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break;
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case 24:
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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Rmask = 0x000000FF;
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Gmask = 0x0000FF00;
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Bmask = 0x00FF0000;
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Rmask = 0x000000FF;
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Gmask = 0x0000FF00;
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Bmask = 0x00FF0000;
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#else
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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#endif
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break;
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case 32:
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/* We don't know if this has alpha channel or not */
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correctAlpha = SDL_TRUE;
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Amask = 0xFF000000;
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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break;
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default:
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break;
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}
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break;
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case 32:
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/* We don't know if this has alpha channel or not */
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correctAlpha = SDL_TRUE;
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Amask = 0xFF000000;
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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break;
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case BI_BITFIELDS:
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break; /* we handled this in the info header. */
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default:
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break;
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}
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break;
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case BI_BITFIELDS:
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break; /* we handled this in the info header. */
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default:
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SDL_SetError("Compressed BMP files not supported");
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was_error = SDL_TRUE;
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goto done;
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}
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/* Create a compatible surface, note that the colors are RGB ordered */
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surface =
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SDL_CreateRGBSurface(0, biWidth, biHeight, biBitCount, Rmask, Gmask,
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Bmask, Amask);
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if (surface == NULL) {
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surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
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biWidth, biHeight, biBitCount, Rmask, Gmask, Bmask, Amask);
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if ( surface == NULL ) {
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was_error = SDL_TRUE;
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goto done;
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}
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/* Load the palette, if any */
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palette = (surface->format)->palette;
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if (palette) {
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SDL_assert(biBitCount <= 8);
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if (biClrUsed == 0) {
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biClrUsed = 1 << biBitCount;
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} else if (biClrUsed > (Uint32)(1 << biBitCount)) {
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SDL_SetError("BMP file has an invalid number of colors");
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was_error = SDL_TRUE;
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goto done;
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if ( palette ) {
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if ( SDL_RWseek(src, fp_offset+14+biSize, RW_SEEK_SET) < 0 ) {
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SDL_Error(SDL_EFSEEK);
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was_error = SDL_TRUE;
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goto done;
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}
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if ((int) biClrUsed > palette->ncolors) {
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SDL_Color *colors;
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int ncolors = biClrUsed;
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colors =
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(SDL_Color *) SDL_realloc(palette->colors,
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ncolors *
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sizeof(*palette->colors));
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if (!colors) {
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SDL_OutOfMemory();
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was_error = SDL_TRUE;
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goto done;
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}
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palette->ncolors = ncolors;
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palette->colors = colors;
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} else if ((int) biClrUsed < palette->ncolors) {
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palette->ncolors = biClrUsed;
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}
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if (biSize == 12) {
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for (i = 0; i < (int) biClrUsed; ++i) {
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/*
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| guich: always use 1<<bpp b/c some bitmaps can bring wrong information
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| for colorsUsed
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*/
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/* if ( biClrUsed == 0 ) { */
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biClrUsed = 1 << biBitCount;
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/* } */
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if ( biSize == 12 ) {
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for ( i = 0; i < (int)biClrUsed; ++i ) {
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SDL_RWread(src, &palette->colors[i].b, 1, 1);
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SDL_RWread(src, &palette->colors[i].g, 1, 1);
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SDL_RWread(src, &palette->colors[i].r, 1, 1);
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palette->colors[i].a = SDL_ALPHA_OPAQUE;
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}
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} else {
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for (i = 0; i < (int) biClrUsed; ++i) {
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for ( i = 0; i < (int)biClrUsed; ++i ) {
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SDL_RWread(src, &palette->colors[i].b, 1, 1);
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SDL_RWread(src, &palette->colors[i].g, 1, 1);
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SDL_RWread(src, &palette->colors[i].r, 1, 1);
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|
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@ -369,104 +434,111 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
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palette->colors[i].a = SDL_ALPHA_OPAQUE;
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}
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}
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palette->ncolors = biClrUsed;
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}
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/* Read the surface pixels. Note that the bmp image is upside down */
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if (SDL_RWseek(src, fp_offset + bfOffBits, RW_SEEK_SET) < 0) {
|
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if ( SDL_RWseek(src, fp_offset+bfOffBits, RW_SEEK_SET) < 0 ) {
|
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SDL_Error(SDL_EFSEEK);
|
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was_error = SDL_TRUE;
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goto done;
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}
|
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if ((biCompression == BI_RLE4) || (biCompression == BI_RLE8)) {
|
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was_error = (SDL_bool)readRlePixels(surface, src, biCompression == BI_RLE8);
|
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if (was_error) SDL_SetError("Error reading from BMP");
|
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goto done;
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}
|
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top = (Uint8 *)surface->pixels;
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end = (Uint8 *)surface->pixels+(surface->h*surface->pitch);
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switch (ExpandBMP) {
|
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case 1:
|
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bmpPitch = (biWidth + 7) >> 3;
|
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
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case 4:
|
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bmpPitch = (biWidth + 1) >> 1;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
|
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default:
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pad = ((surface->pitch % 4) ? (4 - (surface->pitch % 4)) : 0);
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break;
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case 1:
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||||
bmpPitch = (biWidth + 7) >> 3;
|
||||
pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0);
|
||||
break;
|
||||
case 4:
|
||||
bmpPitch = (biWidth + 1) >> 1;
|
||||
pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0);
|
||||
break;
|
||||
default:
|
||||
pad = ((surface->pitch%4) ?
|
||||
(4-(surface->pitch%4)) : 0);
|
||||
break;
|
||||
}
|
||||
if (topDown) {
|
||||
if ( topDown ) {
|
||||
bits = top;
|
||||
} else {
|
||||
bits = end - surface->pitch;
|
||||
}
|
||||
while (bits >= top && bits < end) {
|
||||
while ( bits >= top && bits < end ) {
|
||||
switch (ExpandBMP) {
|
||||
case 1:
|
||||
case 4:{
|
||||
case 1:
|
||||
case 4: {
|
||||
Uint8 pixel = 0;
|
||||
int shift = (8 - ExpandBMP);
|
||||
for (i = 0; i < surface->w; ++i) {
|
||||
if (i % (8 / ExpandBMP) == 0) {
|
||||
if (!SDL_RWread(src, &pixel, 1, 1)) {
|
||||
int shift = (8-ExpandBMP);
|
||||
for ( i=0; i<surface->w; ++i ) {
|
||||
if ( i%(8/ExpandBMP) == 0 ) {
|
||||
if ( !SDL_RWread(src, &pixel, 1, 1) ) {
|
||||
SDL_SetError("Error reading from BMP");
|
||||
was_error = SDL_TRUE;
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
bits[i] = (pixel >> shift);
|
||||
if (bits[i] >= biClrUsed) {
|
||||
SDL_SetError("A BMP image contains a pixel with a color out of the palette");
|
||||
was_error = SDL_TRUE;
|
||||
goto done;
|
||||
}
|
||||
if (bits[i] >= biClrUsed) {
|
||||
SDL_SetError("A BMP image contains a pixel with a color out of the palette");
|
||||
was_error = SDL_TRUE;
|
||||
goto done;
|
||||
}
|
||||
pixel <<= ExpandBMP;
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
if (SDL_RWread(src, bits, 1, surface->pitch) != surface->pitch) {
|
||||
SDL_Error(SDL_EFREAD);
|
||||
was_error = SDL_TRUE;
|
||||
goto done;
|
||||
}
|
||||
if (biBitCount == 8 && palette && biClrUsed < (Uint32)(1 << biBitCount)) {
|
||||
for (i = 0; i < surface->w; ++i) {
|
||||
if (bits[i] >= biClrUsed) {
|
||||
SDL_SetError("A BMP image contains a pixel with a color out of the palette");
|
||||
was_error = SDL_TRUE;
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
}
|
||||
default:
|
||||
if ( SDL_RWread(src, bits, 1, surface->pitch) != surface->pitch ) {
|
||||
SDL_Error(SDL_EFREAD);
|
||||
was_error = SDL_TRUE;
|
||||
goto done;
|
||||
}
|
||||
if (biBitCount == 8 && palette && biClrUsed < (1 << biBitCount)) {
|
||||
for (i = 0; i < surface->w; ++i) {
|
||||
if (bits[i] >= biClrUsed) {
|
||||
SDL_SetError("A BMP image contains a pixel with a color out of the palette");
|
||||
was_error = SDL_TRUE;
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
}
|
||||
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
|
||||
/* Byte-swap the pixels if needed. Note that the 24bpp
|
||||
case has already been taken care of above. */
|
||||
switch (biBitCount) {
|
||||
case 15:
|
||||
case 16:{
|
||||
Uint16 *pix = (Uint16 *) bits;
|
||||
for (i = 0; i < surface->w; i++)
|
||||
pix[i] = SDL_Swap16(pix[i]);
|
||||
break;
|
||||
}
|
||||
/* Byte-swap the pixels if needed. Note that the 24bpp
|
||||
case has already been taken care of above. */
|
||||
switch(biBitCount) {
|
||||
case 15:
|
||||
case 16: {
|
||||
Uint16 *pix = (Uint16 *)bits;
|
||||
for(i = 0; i < surface->w; i++)
|
||||
pix[i] = SDL_Swap16(pix[i]);
|
||||
break;
|
||||
}
|
||||
|
||||
case 32:{
|
||||
Uint32 *pix = (Uint32 *) bits;
|
||||
for (i = 0; i < surface->w; i++)
|
||||
pix[i] = SDL_Swap32(pix[i]);
|
||||
break;
|
||||
case 32: {
|
||||
Uint32 *pix = (Uint32 *)bits;
|
||||
for(i = 0; i < surface->w; i++)
|
||||
pix[i] = SDL_Swap32(pix[i]);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
#endif
|
||||
break;
|
||||
break;
|
||||
}
|
||||
/* Skip padding bytes, ugh */
|
||||
if (pad) {
|
||||
if ( pad ) {
|
||||
Uint8 padbyte;
|
||||
for (i = 0; i < pad; ++i) {
|
||||
for ( i=0; i<pad; ++i ) {
|
||||
SDL_RWread(src, &padbyte, 1, 1);
|
||||
}
|
||||
}
|
||||
if (topDown) {
|
||||
if ( topDown ) {
|
||||
bits += surface->pitch;
|
||||
} else {
|
||||
bits -= surface->pitch;
|
||||
|
|
@ -475,18 +547,20 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
|
|||
if (correctAlpha) {
|
||||
CorrectAlphaChannel(surface);
|
||||
}
|
||||
done:
|
||||
if (was_error) {
|
||||
if (src) {
|
||||
done:
|
||||
if ( was_error ) {
|
||||
if ( src ) {
|
||||
SDL_RWseek(src, fp_offset, RW_SEEK_SET);
|
||||
}
|
||||
SDL_FreeSurface(surface);
|
||||
if ( surface ) {
|
||||
SDL_FreeSurface(surface);
|
||||
}
|
||||
surface = NULL;
|
||||
}
|
||||
if (freesrc && src) {
|
||||
if ( freesrc && src ) {
|
||||
SDL_RWclose(src);
|
||||
}
|
||||
return (surface);
|
||||
return(surface);
|
||||
}
|
||||
|
||||
int
|
||||
|
|
|
|||
Loading…
Reference in New Issue