Mercurial > sdl-ios-xcode
annotate test/testbitmap.c @ 1259:36f24cdfcda7
te: Thu, 17 Apr 2003 11:25:26 -0700
From: "Jim"
Subject: [SDL] Frame buffer patches...
Would seem that GCC 3.2.2 promotes all signed values to unsigned if any single vlaue is unsigned in an expression...
for instance when calculating an elo touch position....evertyhign is an (int) except for cach_vinfo.xres which is unsigned. THerefore if y
ou reverse the SDL_ELO_MIN_X and SDL_ELO_MAX_X values the resulging negative value pegs the expression to it's max. Attached it the accumu
lated patch to typecast the unsigned values to (int)
- *dx = (cache_vinfo.xres - (cache_vinfo.xres * (input_x - ELO_MIN_X)) / width);
+ *dx = ((int)cache_vinfo.xres - ((int)cache_vinfo.xres * (input_x - ELO_MIN_X)) / width);
and also to provide quite failure to operations which have the screen currently locked...
The touch screen I'm using the original values were exactly opposite of any position I touched on the screen - evaluating the math the expr
ession SHOULD have handled reversing the min and max values - and after casting the unsigned .xres and .yres to a signed int - worked well.
..
Jim
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 24 Jan 2006 06:36:43 +0000 |
| parents | be9c9c8f6d53 |
| children | 782fd950bd46 c121d94672cb |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* Simple program: Test bitmap blits */ | |
| 3 | |
| 4 #include <stdio.h> | |
| 5 #include <stdlib.h> | |
| 6 #include <string.h> | |
| 7 | |
| 8 #include "SDL.h" | |
| 9 #include "picture.xbm" | |
| 10 | |
|
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
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parents:
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11 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
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12 static void quit(int rc) |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
diff
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13 { |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
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14 SDL_Quit(); |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
diff
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15 exit(rc); |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
diff
changeset
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16 } |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
diff
changeset
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17 |
| 0 | 18 SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits) |
| 19 { | |
| 20 SDL_Surface *bitmap; | |
| 21 Uint8 *line; | |
| 22 | |
| 23 /* Allocate the bitmap */ | |
| 24 bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0); | |
| 25 if ( bitmap == NULL ) { | |
| 26 fprintf(stderr, "Couldn't allocate bitmap: %s\n", | |
| 27 SDL_GetError()); | |
| 28 return(NULL); | |
| 29 } | |
| 30 | |
| 31 /* Copy the pixels */ | |
| 32 line = (Uint8 *)bitmap->pixels; | |
| 33 w = (w+7)/8; | |
| 34 while ( h-- ) { | |
| 35 memcpy(line, bits, w); | |
| 36 /* X11 Bitmap images have the bits reversed */ | |
| 37 { int i, j; Uint8 *buf, byte; | |
| 38 for ( buf=line, i=0; i<w; ++i, ++buf ) { | |
| 39 byte = *buf; | |
| 40 *buf = 0; | |
| 41 for ( j=7; j>=0; --j ) { | |
| 42 *buf |= (byte&0x01)<<j; | |
| 43 byte >>= 1; | |
| 44 } | |
| 45 } | |
| 46 } | |
| 47 line += bitmap->pitch; | |
| 48 bits += w; | |
| 49 } | |
| 50 return(bitmap); | |
| 51 } | |
| 52 | |
| 53 int main(int argc, char *argv[]) | |
| 54 { | |
| 55 SDL_Surface *screen; | |
| 56 SDL_Surface *bitmap; | |
| 57 Uint8 video_bpp; | |
| 58 Uint32 videoflags; | |
| 59 Uint8 *buffer; | |
|
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60 int i, k, done; |
| 0 | 61 SDL_Event event; |
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62 Uint16 *buffer16; |
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63 Uint16 color; |
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64 Uint8 gradient; |
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65 SDL_Color palette[256]; |
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66 |
| 0 | 67 |
| 68 /* Initialize SDL */ | |
| 69 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
| 70 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); | |
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parents:
691
diff
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71 return(1); |
| 0 | 72 } |
| 73 | |
| 74 video_bpp = 0; | |
| 75 videoflags = SDL_SWSURFACE; | |
| 76 while ( argc > 1 ) { | |
| 77 --argc; | |
| 78 if ( strcmp(argv[argc-1], "-bpp") == 0 ) { | |
| 79 video_bpp = atoi(argv[argc]); | |
| 80 --argc; | |
| 81 } else | |
| 82 if ( strcmp(argv[argc], "-warp") == 0 ) { | |
| 83 videoflags |= SDL_HWPALETTE; | |
| 84 } else | |
| 85 if ( strcmp(argv[argc], "-hw") == 0 ) { | |
| 86 videoflags |= SDL_HWSURFACE; | |
| 87 } else | |
| 88 if ( strcmp(argv[argc], "-fullscreen") == 0 ) { | |
| 89 videoflags |= SDL_FULLSCREEN; | |
| 90 } else { | |
| 91 fprintf(stderr, | |
| 92 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n", | |
| 93 argv[0]); | |
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Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
diff
changeset
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94 quit(1); |
| 0 | 95 } |
| 96 } | |
| 97 | |
| 98 /* Set 640x480 video mode */ | |
| 99 if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) { | |
| 100 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", | |
| 101 video_bpp, SDL_GetError()); | |
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Ryan C. Gordon <icculus@icculus.org>
parents:
691
diff
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102 quit(2); |
| 0 | 103 } |
| 104 | |
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105 if (video_bpp==8) { |
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106 /* Set a gray colormap, reverse order from white to black */ |
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107 for ( i=0; i<256; ++i ) { |
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108 palette[i].r = 255-i; |
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109 palette[i].g = 255-i; |
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110 palette[i].b = 255-i; |
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111 } |
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112 SDL_SetColors(screen, palette, 0, 256); |
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113 } |
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114 |
| 0 | 115 /* Set the surface pixels and refresh! */ |
| 116 if ( SDL_LockSurface(screen) < 0 ) { | |
| 117 fprintf(stderr, "Couldn't lock the display surface: %s\n", | |
| 118 SDL_GetError()); | |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
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diff
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119 quit(2); |
| 0 | 120 } |
| 121 buffer=(Uint8 *)screen->pixels; | |
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122 if (screen->format->BytesPerPixel!=2) { |
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123 for ( i=0; i<screen->h; ++i ) { |
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124 memset(buffer,(i*255)/screen->h, screen->pitch); |
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125 buffer += screen->pitch; |
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126 } |
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127 } |
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128 else |
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129 { |
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130 for ( i=0; i<screen->h; ++i ) { |
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131 gradient=((i*255)/screen->h); |
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132 color = SDL_MapRGB(screen->format, gradient, gradient, gradient); |
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133 buffer16=(Uint16*)buffer; |
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134 for (k=0; k<screen->w; k++) |
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135 { |
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136 *(buffer16+k)=color; |
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137 } |
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138 buffer += screen->pitch; |
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139 } |
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140 } |
| 0 | 141 SDL_UnlockSurface(screen); |
| 142 SDL_UpdateRect(screen, 0, 0, 0, 0); | |
| 143 | |
| 144 /* Load the bitmap */ | |
| 145 bitmap = LoadXBM(screen, picture_width, picture_height, | |
| 146 (Uint8 *)picture_bits); | |
| 147 if ( bitmap == NULL ) { | |
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1151
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
691
diff
changeset
|
148 quit(1); |
| 0 | 149 } |
| 150 | |
| 151 /* Wait for a keystroke */ | |
| 152 done = 0; | |
| 153 while ( !done ) { | |
| 154 /* Check for events */ | |
| 155 while ( SDL_PollEvent(&event) ) { | |
| 156 switch (event.type) { | |
| 157 case SDL_MOUSEBUTTONDOWN: { | |
| 158 SDL_Rect dst; | |
| 159 | |
| 160 dst.x = event.button.x - bitmap->w/2; | |
| 161 dst.y = event.button.y - bitmap->h/2; | |
| 162 dst.w = bitmap->w; | |
| 163 dst.h = bitmap->h; | |
| 164 SDL_BlitSurface(bitmap, NULL, | |
| 165 screen, &dst); | |
| 166 SDL_UpdateRects(screen,1,&dst); | |
| 167 } | |
| 168 break; | |
| 169 case SDL_KEYDOWN: | |
| 170 /* Any key press quits the app... */ | |
| 171 done = 1; | |
| 172 break; | |
| 173 case SDL_QUIT: | |
| 174 done = 1; | |
| 175 break; | |
| 176 default: | |
| 177 break; | |
| 178 } | |
| 179 } | |
| 180 } | |
| 181 SDL_FreeSurface(bitmap); | |
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be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
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parents:
691
diff
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182 SDL_Quit(); |
| 0 | 183 return(0); |
| 184 } |