render/gles2: fix calculation for partial gles2 pixel read
@@ -317,8 +317,8 @@ static bool gles2_read_pixels(struct wlr_renderer *wlr_renderer,
} else {
// Unfortunately GLES2 doesn't support GL_PACK_*, so we have to read
// the lines out row by row
- for (size_t i = src_y; i < src_y + height; ++i) {
- glReadPixels(src_x, src_y + height - i - 1, width, 1, fmt->gl_format,
+ for (size_t i = 0; i < height; ++i) {
+ glReadPixels(src_x, renderer->viewport_height - src_y - i - 1, width, 1, fmt->gl_format,
fmt->gl_type, p + i * stride + dst_x * fmt->bpp / 8);
}
if (flags != NULL) {
