showimage.c
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showimage: A test application for the SDL image loading library.
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Copyright (C) 1999-2004 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
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slouken@libsdl.org
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*/
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/* $Id$ */
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#include <stdlib.h>
#include <stdio.h>
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#include <string.h>
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#include "SDL.h"
#include "SDL_image.h"
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/* #define XPM_INCLUDED and supply picture.xpm to test the XPM inclusion
feature */
#ifdef XPM_INCLUDED
#include "picture.xpm"
#endif
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/* Draw a Gimpish background pattern to show transparency in the image */
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void draw_background(SDL_Surface *screen)
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{
Uint8 *dst = screen->pixels;
int x, y;
int bpp = screen->format->BytesPerPixel;
Uint32 col[2];
col[0] = SDL_MapRGB(screen->format, 0x66, 0x66, 0x66);
col[1] = SDL_MapRGB(screen->format, 0x99, 0x99, 0x99);
for(y = 0; y < screen->h; y++) {
for(x = 0; x < screen->w; x++) {
/* use an 8x8 checkerboard pattern */
Uint32 c = col[((x ^ y) >> 3) & 1];
switch(bpp) {
case 1:
dst[x] = c;
break;
case 2:
((Uint16 *)dst)[x] = c;
break;
case 3:
if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
dst[x * 3] = c;
dst[x * 3 + 1] = c >> 8;
dst[x * 3 + 2] = c >> 16;
} else {
dst[x * 3] = c >> 16;
dst[x * 3 + 1] = c >> 8;
dst[x * 3 + 2] = c;
}
break;
case 4:
((Uint32 *)dst)[x] = c;
break;
}
}
dst += screen->pitch;
}
}
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int main(int argc, char *argv[])
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Uint32 flags;
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SDL_Surface *screen, *image;
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int i, depth, done;
SDL_Event event;
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/* Check command line usage */
if ( ! argv[1] ) {
fprintf(stderr, "Usage: %s <image_file>\n", argv[0]);
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return(1);
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}
/* Initialize the SDL library */
if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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return(255);
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}
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flags = SDL_SWSURFACE;
for ( i=1; argv[i]; ++i ) {
if ( strcmp(argv[i], "-fullscreen") == 0 ) {
SDL_ShowCursor(0);
flags |= SDL_FULLSCREEN;
continue;
}
/* Open the image file */
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#ifdef XPM_INCLUDED
image = IMG_ReadXPMFromArray(picture_xpm);
#else
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image = IMG_Load(argv[i]);
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if ( image == NULL ) {
fprintf(stderr, "Couldn't load %s: %s\n",
argv[i], SDL_GetError());
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continue;
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}
SDL_WM_SetCaption(argv[i], "showimage");
/* Create a display for the image */
depth = SDL_VideoModeOK(image->w, image->h, 32, flags);
/* Use the deepest native mode, except that we emulate 32bpp
for viewing non-indexed images on 8bpp screens */
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if ( depth == 0 ) {
if ( image->format->BytesPerPixel > 1 ) {
depth = 32;
} else {
depth = 8;
}
} else
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if ( (image->format->BytesPerPixel > 1) && (depth == 8) ) {
depth = 32;
}
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if(depth == 8)
flags |= SDL_HWPALETTE;
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screen = SDL_SetVideoMode(image->w, image->h, depth, flags);
if ( screen == NULL ) {
fprintf(stderr,"Couldn't set %dx%dx%d video mode: %s\n",
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image->w, image->h, depth, SDL_GetError());
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continue;
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/* Set the palette, if one exists */
if ( image->format->palette ) {
SDL_SetColors(screen, image->format->palette->colors,
0, image->format->palette->ncolors);
}
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/* Draw a background pattern if the surface has transparency */
if(image->flags & (SDL_SRCALPHA | SDL_SRCCOLORKEY))
draw_background(screen);
/* Display the image */
SDL_BlitSurface(image, NULL, screen, NULL);
SDL_UpdateRect(screen, 0, 0, 0, 0);
done = 0;
while ( ! done ) {
if ( SDL_PollEvent(&event) ) {
switch (event.type) {
case SDL_KEYUP:
switch (event.key.keysym.sym) {
case SDLK_LEFT:
if ( i > 1 ) {
i -= 2;
done = 1;
}
break;
case SDLK_RIGHT:
if ( argv[i+1] ) {
done = 1;
}
break;
case SDLK_ESCAPE:
case SDLK_q:
argv[i+1] = NULL;
/* Drop through to done */
case SDLK_SPACE:
case SDLK_TAB:
done = 1;
break;
default:
break;
}
break;
case SDL_MOUSEBUTTONDOWN:
done = 1;
break;
case SDL_QUIT:
argv[i+1] = NULL;
done = 1;
break;
default:
break;
}
} else {
SDL_Delay(10);
}
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}
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SDL_FreeSurface(image);
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}
/* We're done! */
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SDL_Quit();
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return(0);
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}