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comparison test/testshape.c @ 4799:a0e096916474

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Rewrote test program for shaped windows. It definitely displays recognizable pictures now, but the resizing and shaping functionality isn't behaving correctly, possibly due to a miscalculation of alpha values.
author Eli Gottlieb <eligottlieb@gmail.com>
date Sun, 18 Jul 2010 21:31:22 -0400
parents
children 6d4be626225f
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4798:980614a70cfc 4799:a0e096916474
1 #include <stdlib.h>
2 #include <math.h>
3 #include <SDL_events.h>
4 #include <SDL_rect.h>
5 #include <SDL_pixels.h>
6 #include <SDL_video.h>
7 #include <SDL_shape.h>
8
9 #define SHAPED_WINDOW_X 150
10 #define SHAPED_WINDOW_Y 150
11 #define SHAPED_WINDOW_DIMENSION 640
12
13 int main(int argc,char** argv) {
14 if(argc < 2) {
15 printf("SDL_Shape requires at least one bitmap file as argument.\n");
16 exit(-1);
17 }
18
19 if(SDL_VideoInit(NULL,0) == -1) {
20 printf("Could not initialize SDL video.\n");
21 exit(-2);
22 }
23
24 Uint8 num_pictures = argc - 1;
25 SDL_Surface **pictures = malloc(sizeof(SDL_Surface*)*num_pictures);
26 int i = 0;
27 for(i=0;i<num_pictures;i++)
28 pictures[i] = NULL;
29 for(i=0;i<num_pictures;i++) {
30 SDL_Surface *original = SDL_LoadBMP(argv[i+1]);
31 if(original == NULL) {
32 int j = 0;
33 for(j=0;j<num_pictures;j++)
34 if(pictures[j] != NULL)
35 SDL_FreeSurface(pictures[j]);
36 free(pictures);
37 SDL_VideoQuit();
38 printf("Could not load surface from named bitmap file.\n");
39 exit(-3);
40 }
41 //THIS CONVERSION ROUTINE IS FRAGILE! It relies in the fact that only certain portions of the format structure must be filled in to use it.
42 SDL_PixelFormat format = {NULL,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
43 SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_RGBA8888,&format.BitsPerPixel,&format.Rmask,&format.Gmask,&format.Bmask,&format.Amask);
44 format.BytesPerPixel = format.BitsPerPixel / 8 + (format.BitsPerPixel % 8 > 0 ? 1 : 0);
45 pictures[i] = SDL_ConvertSurface(original,&format,0);
46 //We have no more need of the original now that we have our desired format.
47 SDL_FreeSurface(original);
48 if(pictures[i] == NULL) {
49 int j = 0;
50 for(j=0;j<num_pictures;j++)
51 if(pictures[j] != NULL)
52 SDL_FreeSurface(pictures[j]);
53 free(pictures);
54 SDL_VideoQuit();
55 printf("Could not convert bitmap surface to desired format.\n");
56 exit(-3);
57 }
58
59 if(SDL_MUSTLOCK(pictures[i]))
60 SDL_LockSurface(pictures[i]);
61
62 void* pixels = pictures[i]->pixels;
63 unsigned int pitch = pictures[i]->pitch;
64 int y =0,x = 0;
65 for(y=0;y<pictures[i]->h;y++)
66 for(x=0;x<pictures[i]->w;x++) {
67 Uint32* pixel = pixels+y*pitch+x*pictures[i]->format->BytesPerPixel;
68 Uint8 r = 0,g = 0,b = 0;
69 SDL_GetRGB(*pixel,pictures[i]->format,&r,&g,&b);
70 if(r == g == b == 0x00)
71 *pixel = SDL_MapRGBA(pictures[i]->format,r,g,b,0);
72 }
73
74 if(SDL_MUSTLOCK(pictures[i]))
75 SDL_UnlockSurface(pictures[i]);
76 }
77
78 SDL_Window *window = SDL_CreateShapedWindow("SDL_Shape test",SHAPED_WINDOW_X,SHAPED_WINDOW_Y,SHAPED_WINDOW_DIMENSION,SHAPED_WINDOW_DIMENSION,SDL_WINDOW_RESIZABLE | SDL_WINDOW_SHOWN);
79 if(window == NULL) {
80 for(i=0;i<num_pictures;i++)
81 SDL_FreeSurface(pictures[i]);
82 free(pictures);
83 SDL_VideoQuit();
84 printf("Could not create shaped window for SDL_Shape.\n");
85 exit(-4);
86 }
87 if(SDL_CreateRenderer(window,-1,SDL_RENDERER_PRESENTFLIP2) == -1) {
88 SDL_DestroyWindow(window);
89 for(i=0;i<num_pictures;i++)
90 SDL_FreeSurface(pictures[i]);
91 free(pictures);
92 SDL_VideoQuit();
93 printf("Could not create rendering context for SDL_Shape window.\n");
94 exit(-5);
95 }
96
97 SDL_Texture **textures = malloc(sizeof(SDL_Texture*)*num_pictures);
98 for(i=0;i<num_pictures;i++)
99 textures[i] = NULL;
100 for(i=0;i<num_pictures;i++) {
101 textures[i] = SDL_CreateTextureFromSurface(0,pictures[i]);
102 if(textures[i] == NULL) {
103 int j = 0;
104 for(j=0;j<num_pictures;i++)
105 if(textures[i] != NULL)
106 SDL_DestroyTexture(textures[i]);
107 free(textures);
108 for(i=0;i<num_pictures;i++)
109 SDL_FreeSurface(pictures[i]);
110 free(pictures);
111 SDL_DestroyRenderer(window);
112 SDL_DestroyWindow(window);
113 SDL_VideoQuit();
114 printf("Could not create texture for SDL_shape.\n");
115 exit(-6);
116 }
117 }
118
119 SDL_Event event;
120 int event_pending = 0;
121 event_pending = SDL_PollEvent(&event);
122 unsigned int current_picture = 0;
123 SDL_WindowShapeMode mode = {ShapeModeDefault,1};
124 SDL_SetWindowShape(window,pictures[current_picture],&mode);
125 int mouse_down = 0;
126 Uint32 format,access;
127 SDL_Rect texture_dimensions = {0,0,0,0};
128 SDL_QueryTexture(textures[current_picture],&format,&access,&texture_dimensions.w,&texture_dimensions.h);
129 SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
130 while(event.type != SDL_QUIT) {
131 if(event.type == SDL_MOUSEBUTTONDOWN)
132 mouse_down = 1;
133 if(mouse_down && event.type == SDL_MOUSEBUTTONUP) {
134 mouse_down = 0;
135 current_picture += 1;
136 if(current_picture >= num_pictures)
137 current_picture = 0;
138 SDL_QueryTexture(textures[current_picture],&format,&access,&texture_dimensions.w,&texture_dimensions.h);
139 SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
140 SDL_SetWindowShape(window,pictures[current_picture],&mode);
141 }
142
143 SDL_SelectRenderer(window);
144
145 //Clear render-target to blue.
146 SDL_SetRenderDrawColor(0x00,0x00,0xff,0xff);
147 SDL_RenderClear();
148
149 //Render the texture.
150 SDL_RenderCopy(textures[current_picture],&texture_dimensions,&texture_dimensions);
151
152 SDL_RenderPresent();
153 event_pending = SDL_PollEvent(&event);
154 }
155
156 //Free the textures.
157 for(i=0;i<num_pictures;i++)
158 SDL_DestroyTexture(textures[i]);
159 free(textures);
160 //Destroy the window.
161 SDL_DestroyWindow(window);
162 //Free the original surfaces backing the textures.
163 for(i=0;i<num_pictures;i++)
164 SDL_FreeSurface(pictures[i]);
165 free(pictures);
166 //Call SDL_VideoQuit() before quitting.
167 SDL_VideoQuit();
168 }