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Added a new 'blend_rect' method acting as 'blit_rect' with alpha-blending

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dumitru.stama 2017-06-14 00:55:52 -07:00
parent dc420b3b0a
commit 95dcd22b46
4 changed files with 60 additions and 0 deletions
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46
core/image.cpp
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@ -2217,6 +2217,52 @@ void Image::blit_rect(const Image &p_src, const Rect2 &p_src_rect, const Point2
}
}
void Image::blend_rect(const Image &p_src, const Rect2 &p_src_rect, const Point2 &p_dest) {
int dsize = data.size();
int srcdsize = p_src.data.size();
int dst_data_size = data.size();
ERR_FAIL_COND(dsize == 0);
ERR_FAIL_COND(srcdsize == 0);
ERR_FAIL_COND(dst_data_size == 0);
Rect2 rrect = Rect2(0, 0, p_src.width, p_src.height).clip(p_src_rect);
DVector<uint8_t>::Write wp = data.write();
unsigned char *dst_data_ptr = wp.ptr();
DVector<uint8_t>::Read rp = p_src.data.read();
const unsigned char *src_data_ptr = rp.ptr();
if (format == FORMAT_INDEXED || format == FORMAT_INDEXED || p_src.format == FORMAT_INDEXED || p_src.format == FORMAT_INDEXED_ALPHA) {
return;
} else {
for (int i = 0; i < rrect.size.y; i++) {
if (i + p_dest.y < 0 || i + p_dest.y >= height)
continue;
for (int j = 0; j < rrect.size.x; j++) {
if (j + p_dest.x < 0 || j + p_dest.x >= width)
continue;
BColor src = p_src._get_pixel(rrect.pos.x + j, rrect.pos.y + i, src_data_ptr, srcdsize);
BColor dst = _get_pixel(p_dest.x + j, p_dest.y + i, dst_data_ptr, dst_data_size);
float ba = (float) dst.a / 255.0;
float fa = (float) src.a / 255.0;
dst.r = (uint8_t) (fa*src.r + ba*(1.0 - fa) * dst.r);
dst.g = (uint8_t) (fa*src.g + ba*(1.0 - fa) * dst.g);
dst.b = (uint8_t) (fa*src.b + ba*(1.0 - fa) * dst.b);
dst.a = (uint8_t) (255.0 * (fa + ba * (1.0 - fa)));
_put_pixel(p_dest.x + j, p_dest.y + i, dst, dst_data_ptr);
}
}
}
}
Image (*Image::_png_mem_loader_func)(const uint8_t *, int) = NULL;
Image (*Image::_jpg_mem_loader_func)(const uint8_t *, int) = NULL;