static void handle_proc(const GBitmap& bitmap, void (*proc)(const GBitmap&),
const std::string& root, const char name[]) {
std::string path(root);
path += name;
path += ".png";
// fill the bitmap with transparent black
memset(bitmap.pixels(), 0, bitmap.rowBytes() * bitmap.height());
proc(bitmap);
if (!bitmap.writeToFile(path.c_str())) {
fprintf(stderr, "failed to write %s\n", path.c_str());
}
}
static void draw_circle(const GBitmap& bitmap) {
const GPixel px = GPixel_PackARGB(0xFF, 0xFF, 0, 0);
const float cx = (float)bitmap.width() / 2;
const float cy = (float)bitmap.height() / 2;
const float radius = cx * 5 / 6;
const float radius2 = radius * radius;
GPixel* dst = bitmap.pixels();
for (int y = 0; y < bitmap.height(); ++y) {
const float dy = y - cy;
for (int x = 0; x < bitmap.width(); ++x) {
const float dx = x - cx;
const float dist2 = dx*dx + dy*dy;
if (dist2 <= radius2) {
dst[x] = px;
} else {
dst[x] = 0; // transparent
}
}
dst = (GPixel*)((char*)dst + bitmap.rowBytes());
}
}
static void make_circle(const GBitmap& bitmap, const GColor& color) {
const GPixel px = pin_and_premul_to_pixel(color);
const float cx = (float)bitmap.width() / 2;
const float cy = (float)bitmap.height() / 2;
const float radius = cx - 1;
const float radius2 = radius * radius;
GPixel* dst = bitmap.pixels();
for (int y = 0; y < bitmap.height(); ++y) {
const float dy = y - cy;
for (int x = 0; x < bitmap.width(); ++x) {
const float dx = x - cx;
const float dist2 = dx*dx + dy*dy;
if (dist2 <= radius2) {
dst[x] = px;
} else {
dst[x] = 0; // transparent
}
}
dst = (GPixel*)((char*)dst + bitmap.rowBytes());
}
}
