/project/jni/sdl_image/IMG_pcx.c
https://github.com/aichunyu/FFPlayer · C · 276 lines · 210 code · 22 blank · 44 comment · 64 complexity · 3e2c8fadbf524a6b8db12cc11d83e42f MD5 · raw file
- /*
- SDL_image: An example image loading library for use with SDL
- Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
- This software is provided 'as-is', without any express or implied
- warranty. In no event will the authors be held liable for any damages
- arising from the use of this software.
- Permission is granted to anyone to use this software for any purpose,
- including commercial applications, and to alter it and redistribute it
- freely, subject to the following restrictions:
- 1. The origin of this software must not be misrepresented; you must not
- claim that you wrote the original software. If you use this software
- in a product, an acknowledgment in the product documentation would be
- appreciated but is not required.
- 2. Altered source versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
- 3. This notice may not be removed or altered from any source distribution.
- */
- /*
- * PCX file reader:
- * Supports:
- * 1..4 bits/pixel in multiplanar format (1 bit/plane/pixel)
- * 8 bits/pixel in single-planar format (8 bits/plane/pixel)
- * 24 bits/pixel in 3-plane format (8 bits/plane/pixel)
- *
- * (The <8bpp formats are expanded to 8bpp surfaces)
- *
- * Doesn't support:
- * single-planar packed-pixel formats other than 8bpp
- * 4-plane 32bpp format with a fourth "intensity" plane
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include "SDL_endian.h"
- #include "SDL_image.h"
- #ifdef LOAD_PCX
- struct PCXheader {
- Uint8 Manufacturer;
- Uint8 Version;
- Uint8 Encoding;
- Uint8 BitsPerPixel;
- Sint16 Xmin, Ymin, Xmax, Ymax;
- Sint16 HDpi, VDpi;
- Uint8 Colormap[48];
- Uint8 Reserved;
- Uint8 NPlanes;
- Sint16 BytesPerLine;
- Sint16 PaletteInfo;
- Sint16 HscreenSize;
- Sint16 VscreenSize;
- Uint8 Filler[54];
- };
- /* See if an image is contained in a data source */
- int IMG_isPCX(SDL_RWops *src)
- {
- int start;
- int is_PCX;
- const int ZSoft_Manufacturer = 10;
- const int PC_Paintbrush_Version = 5;
- const int PCX_Uncompressed_Encoding = 0;
- const int PCX_RunLength_Encoding = 1;
- struct PCXheader pcxh;
- if ( !src )
- return 0;
- start = SDL_RWtell(src);
- is_PCX = 0;
- if ( SDL_RWread(src, &pcxh, sizeof(pcxh), 1) == 1 ) {
- if ( (pcxh.Manufacturer == ZSoft_Manufacturer) &&
- (pcxh.Version == PC_Paintbrush_Version) &&
- (pcxh.Encoding == PCX_RunLength_Encoding ||
- pcxh.Encoding == PCX_Uncompressed_Encoding) ) {
- is_PCX = 1;
- }
- }
- SDL_RWseek(src, start, RW_SEEK_SET);
- return(is_PCX);
- }
- /* Load a PCX type image from an SDL datasource */
- SDL_Surface *IMG_LoadPCX_RW(SDL_RWops *src)
- {
- int start;
- struct PCXheader pcxh;
- Uint32 Rmask;
- Uint32 Gmask;
- Uint32 Bmask;
- Uint32 Amask;
- SDL_Surface *surface = NULL;
- int width, height;
- int y, bpl;
- Uint8 *row, *buf = NULL;
- char *error = NULL;
- int bits, src_bits;
- if ( !src ) {
- /* The error message has been set in SDL_RWFromFile */
- return NULL;
- }
- start = SDL_RWtell(src);
- if ( ! SDL_RWread(src, &pcxh, sizeof(pcxh), 1) ) {
- error = "file truncated";
- goto done;
- }
- pcxh.Xmin = SDL_SwapLE16(pcxh.Xmin);
- pcxh.Ymin = SDL_SwapLE16(pcxh.Ymin);
- pcxh.Xmax = SDL_SwapLE16(pcxh.Xmax);
- pcxh.Ymax = SDL_SwapLE16(pcxh.Ymax);
- pcxh.BytesPerLine = SDL_SwapLE16(pcxh.BytesPerLine);
- /* Create the surface of the appropriate type */
- width = (pcxh.Xmax - pcxh.Xmin) + 1;
- height = (pcxh.Ymax - pcxh.Ymin) + 1;
- Rmask = Gmask = Bmask = Amask = 0;
- src_bits = pcxh.BitsPerPixel * pcxh.NPlanes;
- if((pcxh.BitsPerPixel == 1 && pcxh.NPlanes >= 1 && pcxh.NPlanes <= 4)
- || (pcxh.BitsPerPixel == 8 && pcxh.NPlanes == 1)) {
- bits = 8;
- } else if(pcxh.BitsPerPixel == 8 && pcxh.NPlanes == 3) {
- bits = 24;
- if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) {
- Rmask = 0x000000FF;
- Gmask = 0x0000FF00;
- Bmask = 0x00FF0000;
- } else {
- Rmask = 0xFF0000;
- Gmask = 0x00FF00;
- Bmask = 0x0000FF;
- }
- } else {
- error = "unsupported PCX format";
- goto done;
- }
- surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height,
- bits, Rmask, Gmask, Bmask, Amask);
- if ( surface == NULL )
- goto done;
- bpl = pcxh.NPlanes * pcxh.BytesPerLine;
- if (bpl > surface->pitch) {
- error = "bytes per line is too large (corrupt?)";
- }
- buf = malloc(bpl);
- row = surface->pixels;
- for ( y=0; y<surface->h; ++y ) {
- /* decode a scan line to a temporary buffer first */
- int i, count = 0;
- Uint8 ch;
- Uint8 *dst = (src_bits == 8) ? row : buf;
- if ( pcxh.Encoding == 0 ) {
- if(!SDL_RWread(src, dst, bpl, 1)) {
- error = "file truncated";
- goto done;
- }
- } else {
- for(i = 0; i < bpl; i++) {
- if(!count) {
- if(!SDL_RWread(src, &ch, 1, 1)) {
- error = "file truncated";
- goto done;
- }
- if( (ch & 0xc0) == 0xc0) {
- count = ch & 0x3f;
- if(!SDL_RWread(src, &ch, 1, 1)) {
- error = "file truncated";
- goto done;
- }
- } else
- count = 1;
- }
- dst[i] = ch;
- count--;
- }
- }
- if(src_bits <= 4) {
- /* expand planes to 1 byte/pixel */
- Uint8 *src = buf;
- int plane;
- for(plane = 0; plane < pcxh.NPlanes; plane++) {
- int i, j, x = 0;
- for(i = 0; i < pcxh.BytesPerLine; i++) {
- Uint8 byte = *src++;
- for(j = 7; j >= 0; j--) {
- unsigned bit = (byte >> j) & 1;
- /* skip padding bits */
- if (i * 8 + j >= width)
- continue;
- row[x++] |= bit << plane;
- }
- }
- }
- } else if(src_bits == 24) {
- /* de-interlace planes */
- Uint8 *src = buf;
- int plane;
- for(plane = 0; plane < pcxh.NPlanes; plane++) {
- int x;
- dst = row + plane;
- for(x = 0; x < width; x++) {
- *dst = *src++;
- dst += pcxh.NPlanes;
- }
- }
- }
- row += surface->pitch;
- }
- if(bits == 8) {
- SDL_Color *colors = surface->format->palette->colors;
- int nc = 1 << src_bits;
- int i;
- surface->format->palette->ncolors = nc;
- if(src_bits == 8) {
- Uint8 ch;
- /* look for a 256-colour palette */
- do {
- if ( !SDL_RWread(src, &ch, 1, 1)) {
- error = "file truncated";
- goto done;
- }
- } while ( ch != 12 );
- for(i = 0; i < 256; i++) {
- SDL_RWread(src, &colors[i].r, 1, 1);
- SDL_RWread(src, &colors[i].g, 1, 1);
- SDL_RWread(src, &colors[i].b, 1, 1);
- }
- } else {
- for(i = 0; i < nc; i++) {
- colors[i].r = pcxh.Colormap[i * 3];
- colors[i].g = pcxh.Colormap[i * 3 + 1];
- colors[i].b = pcxh.Colormap[i * 3 + 2];
- }
- }
- }
- done:
- free(buf);
- if ( error ) {
- SDL_RWseek(src, start, RW_SEEK_SET);
- if ( surface ) {
- SDL_FreeSurface(surface);
- surface = NULL;
- }
- IMG_SetError(error);
- }
- return(surface);
- }
- #else
- /* See if an image is contained in a data source */
- int IMG_isPCX(SDL_RWops *src)
- {
- return(0);
- }
- /* Load a PCX type image from an SDL datasource */
- SDL_Surface *IMG_LoadPCX_RW(SDL_RWops *src)
- {
- return(NULL);
- }
- #endif /* LOAD_PCX */