| 0,0 → 1,185 |
|---|
| /* |
| SHOW: A test application for the SDL image loading library. |
| Copyright (C) 1999 Sam Lantinga |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| Sam Lantinga |
| 5635-34 Springhouse Dr. |
| Pleasanton, CA 94588 (USA) |
| slouken@devolution.com |
| */ |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "SDL.h" |
| #include "SDL_image.h" |
| |
| |
| /* Draw a Gimpish background pattern to show transparency in the image */ |
| void draw_background(SDL_Surface *screen) |
| { |
| 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; |
| } |
| } |
| |
| int app_main(int argc, char *argv[]) |
| { |
| Uint32 flags; |
| SDL_Surface *screen, *image; |
| int i, depth, done; |
| SDL_Event event; |
| |
| argv[1]="../1/test.png"; |
| argc=2; |
| /* Initialize the SDL library */ |
| if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { |
| SDL_printf("Couldn't initialize SDL: %s\n",SDL_GetError()); |
| return(255); |
| } |
| |
| flags = SDL_SWSURFACE; |
| for ( i=1; i<argc; ++i ) { |
| SDL_ShowCursor(0); |
| image = IMG_Load(argv[i]); |
| if ( image == NULL ) { |
| SDL_printf("Couldn't load %s: %s\n", |
| argv[i], SDL_GetError()); |
| continue; |
| } |
| { |
| static char xttl[128]; |
| sprintf(xttl,"Showimage - filename is \"%s\"",argv[1]); |
| SDL_WM_SetCaption(xttl, "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 */ |
| if ( depth == 0 ) { |
| if ( image->format->BytesPerPixel > 1 ) { |
| depth = 32; |
| } else { |
| depth = 8; |
| } |
| } else |
| if ( (image->format->BytesPerPixel > 1) && (depth == 8) ) { |
| depth = 32; |
| } |
| if(depth == 8) |
| flags |= SDL_HWPALETTE; |
| screen = SDL_SetVideoMode(image->w, image->h, depth, flags); |
| if ( screen == NULL ) { |
| SDL_printf("Couldn't set %dx%dx%d video mode: %s\n", |
| image->w, image->h, depth, SDL_GetError()); |
| continue; |
| } |
| |
| /* Set the palette, if one exists */ |
| if ( image->format->palette ) { |
| SDL_SetColors(screen, image->format->palette->colors, |
| 0, image->format->palette->ncolors); |
| } |
| |
| /* 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_QUIT: |
| argv[i+1] = NULL; |
| done = 1; |
| break; |
| default: |
| break; |
| } |
| } else { |
| SDL_Delay(3); |
| } |
| } |
| SDL_FreeSurface(image); |
| } |
| |
| /* We're done! */ |
| SDL_Quit(); |
| return(0); |
| } |