a855d62025
This ports Fabien Sanglard's Chocolate Duke to run on a version of SDL for Rockbox. Change-Id: I8f2c4c78af19de10c1633ed7bb7a997b43256dd9
276 lines
6.6 KiB
C
276 lines
6.6 KiB
C
/*
|
|
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_AllocSurface(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 */
|