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// Copyright (c) 2018 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 "components/viz/common/skia_helper.h"
#include "base/trace_event/trace_event.h"
#include "cc/base/math_util.h"
#include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
#include "third_party/skia/include/effects/SkColorMatrix.h"
#include "third_party/skia/include/effects/SkOverdrawColorFilter.h"
#include "third_party/skia/include/gpu/GrBackendSurface.h"
#include "third_party/skia/include/gpu/GrContext.h"
#include "ui/gfx/skia_util.h"
namespace viz {
sk_sp<SkImage> SkiaHelper::ApplyImageFilter(GrContext* context,
sk_sp<SkImage> src_image,
const gfx::RectF& src_rect,
const gfx::RectF& dst_rect,
const gfx::Vector2dF& scale,
sk_sp<SkImageFilter> filter,
SkIPoint* offset,
SkIRect* subset,
const gfx::PointF& origin,
bool flush) {
if (!filter)
return nullptr;
if (!src_image) {
TRACE_EVENT_INSTANT0("viz",
"ApplyImageFilter wrap background texture failed",
TRACE_EVENT_SCOPE_THREAD);
return nullptr;
}
// Big filters can sometimes fallback to CPU. Therefore, we need
// to disable subnormal floats for performance and security reasons.
cc::ScopedSubnormalFloatDisabler disabler;
SkMatrix local_matrix;
local_matrix.setTranslate(origin.x(), origin.y());
local_matrix.postScale(scale.x(), scale.y());
local_matrix.postTranslate(-src_rect.x(), -src_rect.y());
SkIRect clip_bounds = gfx::RectFToSkRect(dst_rect).roundOut();
clip_bounds.offset(-src_rect.x(), -src_rect.y());
filter = filter->makeWithLocalMatrix(local_matrix);
SkIRect in_subset = SkIRect::MakeWH(src_rect.width(), src_rect.height());
sk_sp<SkImage> image = src_image->makeWithFilter(
context, filter.get(), in_subset, clip_bounds, subset, offset);
if (!image || !image->isTextureBacked()) {
return nullptr;
}
// Force a flush of the Skia pipeline before we switch back to the compositor
// context.
image->getBackendTexture(flush);
CHECK(image->isTextureBacked());
return image;
}
sk_sp<SkColorFilter> SkiaHelper::MakeOverdrawColorFilter() {
static const SkColor colors[SkOverdrawColorFilter::kNumColors] = {
0x00000000, 0x00000000, 0x2f0000ff, 0x2f00ff00, 0x3fff0000, 0x7fff0000,
};
return SkOverdrawColorFilter::MakeWithSkColors(colors);
}
sk_sp<SkImageFilter> SkiaHelper::BuildOpacityFilter(float opacity) {
SkColorMatrix matrix;
matrix.setScale(1.f, 1.f, 1.f, opacity);
return SkColorFilterImageFilter::Make(SkColorFilters::Matrix(matrix),
nullptr);
}
} // namespace viz
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