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another cairo example

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This commit is contained in:
Jonathan Campbell 2019-04-01 19:00:21 -07:00
parent 3d3e2d95ed
commit 7fcf1002a3
1 changed files with 16 additions and 22 deletions
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38
experiments/cairo/cairo3.cpp
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@ -31,7 +31,21 @@ int main() {
return 1;
}
cairo_surface_t* csurf = cairo_image_surface_create(csurffmt, 320, 240);
if (surface->pixels == NULL || SDL_MUSTLOCK(surface)) {
fprintf(stderr,"Surface not appropriate for Cairo\n");
return 1;
}
int csurfpitch = cairo_format_stride_for_width(csurffmt, 320);
fprintf(stderr,"Cairo stride %d\n",csurfpitch);
fprintf(stderr,"SDL stride %d\n",surface->pitch);
if (csurfpitch != surface->pitch) {
fprintf(stderr,"Sorry, Cairo and SDL do not agree\n");
return 1;
}
cairo_surface_t* csurf = cairo_image_surface_create_for_data((unsigned char*)surface->pixels, csurffmt, 320, 240, csurfpitch);
if (csurf == NULL)
return 1;
@ -115,28 +129,8 @@ int main() {
// copy Cairo output to display
cairo_surface_flush(csurf);
{
unsigned char *cbuf = cairo_image_surface_get_data(csurf);
int width = cairo_image_surface_get_width(csurf);
int height = cairo_image_surface_get_height(csurf);
int stride = cairo_image_surface_get_stride(csurf);
SDL_LockSurface(surface);
if (cbuf != NULL && surface->pixels != NULL) {
if (width > surface->w) width = surface->w;
if (height > surface->h) height = surface->h;
for (int y=0;y < height;y++) {
unsigned char *d = (unsigned char*)(surface->pixels) + (surface->pitch * y);
unsigned char *s = (unsigned char*)(cbuf) + (stride * y);
memcpy(d,s,width*surface->format->BytesPerPixel);
}
}
SDL_UnlockSurface(surface);
SDL_UpdateWindowSurface(window);
}
SDL_UpdateWindowSurface(window);
SDL_Delay(1000 / 30);
}