optimize SDL_FillRect

1 files changed, 50 insertions, 0 deletions

diff --git a/tests/sdl_canvas.c b/tests/sdl_canvas.c
new file mode 100644
index 00000000..a73c4351
--- /dev/null
+++ b/tests/sdl_canvas.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <SDL/SDL.h>
+#include <SDL/SDL_ttf.h>
+#include <emscripten.h>
+
+int main() {
+  SDL_Init(SDL_INIT_VIDEO);
+  SDL_Surface *screen = SDL_SetVideoMode(600, 450, 32, SDL_HWSURFACE);
+
+  printf("Init: %d\n", TTF_Init());
+
+  TTF_Font *font = TTF_OpenFont("myfont.ttf", 40);
+  printf("Font: %p\n", font);
+
+  SDL_Color color = { 0xff, 0x99, 0x00, 0x77 };
+
+  SDL_Surface *text = TTF_RenderText_Solid(font, "hello orange world", color);
+
+  SDL_Color color2 = { 0xbb, 0, 0xff, 0 };
+  SDL_Surface *text2 = TTF_RenderText_Solid(font, "a second line, purple", color2);
+
+  // render
+  SDL_Rect dest = { 0, 50, 0, 0 };
+  SDL_BlitSurface (text, NULL, screen, NULL);
+  dest.y = 100;
+  SDL_BlitSurface (text2, NULL, screen, &dest);
+
+  // fill stuff
+  SDL_Rect rect = { 200, 200, 175, 125 };
+  SDL_FillRect(screen, &rect, 0x2222ff00);
+
+  SDL_Flip(screen); 
+
+  SDL_LockSurface(screen);
+  int sum = 0;
+  for (int i = 0; i < screen->h; i++) {
+    sum += *((char*)screen->pixels + i*screen->w*4 + i*4 + 0);
+  }
+  printf("Sum: %d\n", sum);
+
+  printf("you should see two lines of text in different colors and a blue rectangle\n");
+
+  SDL_Quit();
+
+  int result = sum;
+  REPORT_RESULT();
+
+  return 0;
+}
+