1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "third_party/blink/renderer/core/paint/html_canvas_painter.h"
6
7 #include "third_party/blink/renderer/core/html/canvas/canvas_rendering_context.h"
8 #include "third_party/blink/renderer/core/html/canvas/html_canvas_element.h"
9 #include "third_party/blink/renderer/core/layout/layout_html_canvas.h"
10 #include "third_party/blink/renderer/core/paint/paint_info.h"
11 #include "third_party/blink/renderer/platform/geometry/layout_point.h"
12 #include "third_party/blink/renderer/platform/graphics/paint/drawing_recorder.h"
13 #include "third_party/blink/renderer/platform/graphics/paint/foreign_layer_display_item.h"
14 #include "third_party/blink/renderer/platform/graphics/scoped_interpolation_quality.h"
15
16 namespace blink {
17
18 namespace {
19
InterpolationQualityForCanvas(const ComputedStyle & style)20 InterpolationQuality InterpolationQualityForCanvas(const ComputedStyle& style) {
21 if (style.ImageRendering() == EImageRendering::kWebkitOptimizeContrast)
22 return kInterpolationLow;
23
24 if (style.ImageRendering() == EImageRendering::kPixelated)
25 return kInterpolationNone;
26
27 return CanvasDefaultInterpolationQuality;
28 }
29
30 } // namespace
31
PaintReplaced(const PaintInfo & paint_info,const PhysicalOffset & paint_offset)32 void HTMLCanvasPainter::PaintReplaced(const PaintInfo& paint_info,
33 const PhysicalOffset& paint_offset) {
34 GraphicsContext& context = paint_info.context;
35
36 PhysicalRect paint_rect = layout_html_canvas_.ReplacedContentRect();
37 paint_rect.Move(paint_offset);
38
39 auto* canvas = To<HTMLCanvasElement>(layout_html_canvas_.GetNode());
40 if (canvas->IsOffscreenCanvasRegistered())
41 canvas->UpdateOffscreenCanvasFilterQuality(canvas->FilterQuality());
42
43 if (RuntimeEnabledFeatures::CompositeAfterPaintEnabled()) {
44 if (auto* layer = canvas->ContentsCcLayer()) {
45 IntRect pixel_snapped_rect = PixelSnappedIntRect(paint_rect);
46 layer->SetBounds(gfx::Size(pixel_snapped_rect.Size()));
47 layer->SetIsDrawable(true);
48 layer->SetHitTestable(true);
49 RecordForeignLayer(context, layout_html_canvas_,
50 DisplayItem::kForeignLayerCanvas, layer,
51 FloatPoint(pixel_snapped_rect.Location()));
52 return;
53 }
54 }
55
56 if (DrawingRecorder::UseCachedDrawingIfPossible(context, layout_html_canvas_,
57 paint_info.phase))
58 return;
59
60 DrawingRecorder recorder(context, layout_html_canvas_, paint_info.phase);
61 ScopedInterpolationQuality interpolation_quality_scope(
62 context, InterpolationQualityForCanvas(layout_html_canvas_.StyleRef()));
63 canvas->Paint(
64 context, paint_rect,
65 paint_info.GetGlobalPaintFlags() == kGlobalPaintFlattenCompositingLayers);
66 }
67
68 } // namespace blink
69