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Unified Diff: cc/resources/raster_source_helper.cc

Issue 761903003: Update from https://crrev.com/306655 (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 6 years ago
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Index: cc/resources/raster_source_helper.cc
diff --git a/cc/resources/raster_source_helper.cc b/cc/resources/raster_source_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f7ef305a65a4cdc1dc7d8e4263f852d564b201ba
--- /dev/null
+++ b/cc/resources/raster_source_helper.cc
@@ -0,0 +1,81 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/resources/raster_source_helper.h"
+
+#include "base/debug/trace_event.h"
+#include "cc/debug/debug_colors.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "ui/gfx/geometry/rect_conversions.h"
+#include "ui/gfx/skia_util.h"
+
+namespace cc {
+
+void RasterSourceHelper::PrepareForPlaybackToCanvas(
+ SkCanvas* canvas,
+ const gfx::Rect& canvas_rect,
+ const gfx::Rect& source_rect,
+ float contents_scale,
+ SkColor background_color,
+ bool clear_canvas_with_debug_color,
+ bool requires_clear) {
+ canvas->discard();
+ if (clear_canvas_with_debug_color) {
+ // Any non-painted areas in the content bounds will be left in this color.
+ canvas->clear(DebugColors::NonPaintedFillColor());
+ }
+
+ // If this raster source has opaque contents, it is guaranteeing that it will
+ // draw an opaque rect the size of the layer. If it is not, then we must
+ // clear this canvas ourselves.
+ if (requires_clear) {
+ TRACE_EVENT_INSTANT0("cc", "SkCanvas::clear", TRACE_EVENT_SCOPE_THREAD);
+ // Clearing is about ~4x faster than drawing a rect even if the content
+ // isn't covering a majority of the canvas.
+ canvas->clear(SK_ColorTRANSPARENT);
+ } else {
+ // Even if completely covered, for rasterizations that touch the edge of the
+ // layer, we also need to raster the background color underneath the last
+ // texel (since the recording won't cover it) and outside the last texel
+ // (due to linear filtering when using this texture).
+ gfx::Rect content_rect =
+ gfx::ToEnclosingRect(gfx::ScaleRect(source_rect, contents_scale));
+
+ // The final texel of content may only be partially covered by a
+ // rasterization; this rect represents the content rect that is fully
+ // covered by content.
+ gfx::Rect deflated_content_rect = content_rect;
+ deflated_content_rect.Inset(0, 0, 1, 1);
+ if (!deflated_content_rect.Contains(canvas_rect)) {
+ if (clear_canvas_with_debug_color) {
+ // Any non-painted areas outside of the content bounds are left in
+ // this color. If this is seen then it means that cc neglected to
+ // rerasterize a tile that used to intersect with the content rect
+ // after the content bounds grew.
+ canvas->save();
+ canvas->translate(-canvas_rect.x(), -canvas_rect.y());
+ canvas->clipRect(gfx::RectToSkRect(content_rect),
+ SkRegion::kDifference_Op);
+ canvas->drawColor(DebugColors::MissingResizeInvalidations(),
+ SkXfermode::kSrc_Mode);
+ canvas->restore();
+ }
+
+ // Drawing at most 2 x 2 x (canvas width + canvas height) texels is 2-3X
+ // faster than clearing, so special case this.
+ canvas->save();
+ canvas->translate(-canvas_rect.x(), -canvas_rect.y());
+ gfx::Rect inflated_content_rect = content_rect;
+ inflated_content_rect.Inset(0, 0, -1, -1);
+ canvas->clipRect(gfx::RectToSkRect(inflated_content_rect),
+ SkRegion::kReplace_Op);
+ canvas->clipRect(gfx::RectToSkRect(deflated_content_rect),
+ SkRegion::kDifference_Op);
+ canvas->drawColor(background_color, SkXfermode::kSrc_Mode);
+ canvas->restore();
+ }
+ }
+}
+
+} // namespace cc
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