Check result of Sk[I]Rect::intersect

https://skia-review.googlesource.com/c/skia/+/589412 will be adding
[[nodiscard]] to these functions.

Bug: skia:11782
Change-Id: I450154cc651e0f0375b5e690e4d815a97960e911
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5798849
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Cr-Commit-Position: refs/heads/main@{#1344282}

skia/ext/draw_gainmap_image.cc

@@ -83,13 +83,8 @@ void DrawGainmapImageRect(SkCanvas* canvas,
   // Compute `dest_rect_clipped` to be intersected with the pre-image of the
   // clip rect of `canvas`.
   SkRect dest_rect_clipped = dest_rect;
-  const SkMatrix& dest_to_device = canvas->getTotalMatrix();
-  SkMatrix device_to_dest;
-  if (dest_to_device.invert(&device_to_dest)) {
-    SkRect dest_clip_rect;
-    device_to_dest.mapRect(&dest_clip_rect,
-                           SkRect::Make(canvas->getDeviceClipBounds()));
-    dest_rect_clipped.intersect(dest_clip_rect);
+  if (!dest_rect_clipped.intersect(canvas->getLocalClipBounds())) {
+    return;
   }
 
   // Compute the input rect for the base and gainmap images.

skia/ext/geometry.cc

@@ -91,7 +91,10 @@ void Tiling::GetTileRect(
                        dest_rect_.y() + y * tile_size_.height(),
                        dest_rect_.x() + (x + 1) * tile_size_.width(),
                        dest_rect_.y() + (y + 1) * tile_size_.height());
-  tile_dest_rect.intersect(dest_rect_);
+  if (!tile_dest_rect.intersect(dest_rect_)) {
+    tile_dest_rect = SkRect::MakeEmpty();
+    return;
+  }
 
   tile_source_rects.resize(source_count_);
   tile_source_subset_rects.resize(source_count_);

third_party/blink/renderer/modules/canvas/canvas2d/base_rendering_context_2d.h

@@ -927,8 +927,8 @@ ALWAYS_INLINE void BaseRenderingContext2D::ResetAlphaIfNeeded(
     if (!c->getLocalClipBounds(&alpha_bounds)) {
       return;
     }
-    if (bounds) {
-      alpha_bounds.intersect(gfx::RectFToSkRect(*bounds));
+    if (bounds && !alpha_bounds.intersect(gfx::RectFToSkRect(*bounds))) {
+      return;
     }
     c->drawRect(alpha_bounds, flags);
   }