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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_SCOPED_IMAGE_RENDERING_SETTINGS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_SCOPED_IMAGE_RENDERING_SETTINGS_H_
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context_types.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
// Helper to update the image rendering settings of a GraphicsContext within the
// current scope. Be careful when mixing with other GraphicsContext mechanisms
// that save/restore state (like GraphicsContextStateSaver or the Save/Restore
// methods) to ensure the restoration behavior is the expected one.
class ScopedImageRenderingSettings {
STACK_ALLOCATED();
public:
ScopedImageRenderingSettings(GraphicsContext& context,
InterpolationQuality interpolation_quality,
DynamicRangeLimit dynamic_range_limit)
: context_(context),
previous_interpolation_quality_(context.ImageInterpolationQuality()),
previous_dynamic_range_limit_(context.DynamicRangeLimit()) {
if (previous_interpolation_quality_ != interpolation_quality) {
context_.SetImageInterpolationQuality(interpolation_quality);
}
if (previous_dynamic_range_limit_ != dynamic_range_limit) {
context_.SetDynamicRangeLimit(dynamic_range_limit);
}
}
~ScopedImageRenderingSettings() {
if (previous_interpolation_quality_ !=
context_.ImageInterpolationQuality()) {
context_.SetImageInterpolationQuality(previous_interpolation_quality_);
}
if (previous_dynamic_range_limit_ != context_.DynamicRangeLimit()) {
context_.SetDynamicRangeLimit(previous_dynamic_range_limit_);
}
}
private:
GraphicsContext& context_;
const InterpolationQuality previous_interpolation_quality_;
const DynamicRangeLimit previous_dynamic_range_limit_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_SCOPED_IMAGE_RENDERING_SETTINGS_H_
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