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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/platform/graphics/filters/paint_filter_builder.h"
#include "SkBlurImageFilter.h"
#include "SkColorFilterImageFilter.h"
#include "SkColorMatrixFilter.h"
#include "SkTableColorFilter.h"
#include "third_party/blink/renderer/platform/graphics/box_reflection.h"
#include "third_party/blink/renderer/platform/graphics/filters/filter_effect.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_canvas.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_record.h"
#include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h"
#include "third_party/skia/include/effects/SkImageSource.h"
#include "third_party/skia/include/effects/SkOffsetImageFilter.h"
#include "third_party/skia/include/effects/SkPictureImageFilter.h"
#include "third_party/skia/include/effects/SkXfermodeImageFilter.h"
namespace blink {
namespace PaintFilterBuilder {
void PopulateSourceGraphicImageFilters(
FilterEffect* source_graphic,
sk_sp<PaintFilter> input,
InterpolationSpace input_interpolation_space) {
// Prepopulate SourceGraphic with two image filters: one with a null image
// filter, and the other with a colorspace conversion filter.
// We don't know what color space the interior nodes will request, so we
// have to initialize SourceGraphic with both options.
// Since we know SourceGraphic is always PM-valid, we also use these for
// the PM-validated options.
sk_sp<PaintFilter> device_filter = TransformInterpolationSpace(
input, input_interpolation_space, kInterpolationSpaceSRGB);
sk_sp<PaintFilter> linear_filter = TransformInterpolationSpace(
input, input_interpolation_space, kInterpolationSpaceLinear);
source_graphic->SetImageFilter(kInterpolationSpaceSRGB, false, device_filter);
source_graphic->SetImageFilter(kInterpolationSpaceLinear, false,
linear_filter);
source_graphic->SetImageFilter(kInterpolationSpaceSRGB, true, device_filter);
source_graphic->SetImageFilter(kInterpolationSpaceLinear, true,
linear_filter);
}
sk_sp<PaintFilter> Build(
FilterEffect* effect,
InterpolationSpace interpolation_space,
bool destination_requires_valid_pre_multiplied_pixels) {
if (!effect)
return nullptr;
bool requires_pm_color_validation =
effect->MayProduceInvalidPreMultipliedPixels() &&
destination_requires_valid_pre_multiplied_pixels;
if (PaintFilter* filter = effect->GetImageFilter(
interpolation_space, requires_pm_color_validation))
return sk_ref_sp(filter);
// Note that we may still need the color transform even if the filter is null
sk_sp<PaintFilter> orig_filter =
requires_pm_color_validation
? effect->CreateImageFilter()
: effect->CreateImageFilterWithoutValidation();
sk_sp<PaintFilter> filter = TransformInterpolationSpace(
orig_filter, effect->OperatingInterpolationSpace(), interpolation_space);
effect->SetImageFilter(interpolation_space, requires_pm_color_validation,
filter);
if (filter.get() != orig_filter.get()) {
effect->SetImageFilter(effect->OperatingInterpolationSpace(),
requires_pm_color_validation,
std::move(orig_filter));
}
return filter;
}
sk_sp<PaintFilter> TransformInterpolationSpace(
sk_sp<PaintFilter> input,
InterpolationSpace src_interpolation_space,
InterpolationSpace dst_interpolation_space) {
sk_sp<SkColorFilter> color_filter =
InterpolationSpaceUtilities::CreateInterpolationSpaceFilter(
src_interpolation_space, dst_interpolation_space);
if (!color_filter)
return input;
return sk_make_sp<ColorFilterPaintFilter>(std::move(color_filter),
std::move(input));
}
void BuildSourceGraphic(FilterEffect* source_graphic,
sk_sp<PaintRecord> record,
const FloatRect& record_bounds) {
DCHECK(record);
sk_sp<PaintFilter> filter =
sk_make_sp<RecordPaintFilter>(record, record_bounds);
PopulateSourceGraphicImageFilters(
source_graphic, std::move(filter),
source_graphic->OperatingInterpolationSpace());
}
static const float kMaxMaskBufferSize =
50.f * 1024.f * 1024.f / 4.f; // 50MB / 4 bytes per pixel
sk_sp<PaintFilter> BuildBoxReflectFilter(const BoxReflection& reflection,
sk_sp<PaintFilter> input) {
sk_sp<PaintFilter> masked_input;
if (sk_sp<PaintRecord> mask_record = reflection.Mask()) {
// Since PaintRecords can't be serialized to the browser process, first
// raster the mask to a bitmap, then encode it in an SkImageSource, which
// can be serialized.
SkBitmap bitmap;
const SkRect mask_record_bounds = reflection.MaskBounds();
SkRect mask_bounds_rounded;
mask_record_bounds.roundOut(&mask_bounds_rounded);
SkScalar mask_buffer_size =
mask_bounds_rounded.width() * mask_bounds_rounded.height();
if (mask_buffer_size < kMaxMaskBufferSize && mask_buffer_size > 0.0f) {
bitmap.allocPixels(SkImageInfo::MakeN32Premul(
mask_bounds_rounded.width(), mask_bounds_rounded.height()));
SkiaPaintCanvas canvas(bitmap);
canvas.clear(SK_ColorTRANSPARENT);
canvas.translate(-mask_record_bounds.x(), -mask_record_bounds.y());
canvas.drawPicture(mask_record);
PaintImage image = PaintImageBuilder::WithDefault()
.set_id(PaintImage::GetNextId())
.set_image(SkImage::MakeFromBitmap(bitmap),
PaintImage::GetNextContentId())
.TakePaintImage();
// SkXfermodeImageFilter can choose an excessively large size if the
// mask is smaller than the filtered contents (due to overflow).
// http://skbug.com/5210
PaintFilter::CropRect crop_rect(mask_record_bounds);
SkRect image_rect = SkRect::MakeWH(image.width(), image.height());
masked_input = sk_make_sp<XfermodePaintFilter>(
SkBlendMode::kSrcIn,
sk_make_sp<OffsetPaintFilter>(
mask_record_bounds.x(), mask_record_bounds.y(),
sk_make_sp<ImagePaintFilter>(std::move(image), image_rect,
image_rect, kHigh_SkFilterQuality)),
input, &crop_rect);
} else {
// If the buffer is excessively big, give up and make an
// SkPictureImageFilter anyway, even if it might not render.
PaintFilter::CropRect crop_rect(mask_record_bounds);
masked_input = sk_make_sp<XfermodePaintFilter>(
SkBlendMode::kSrcOver,
sk_make_sp<RecordPaintFilter>(std::move(mask_record),
mask_record_bounds),
input, &crop_rect);
}
} else {
masked_input = input;
}
sk_sp<PaintFilter> flip_image_filter = sk_make_sp<MatrixPaintFilter>(
reflection.ReflectionMatrix(), kLow_SkFilterQuality,
std::move(masked_input));
return sk_make_sp<XfermodePaintFilter>(SkBlendMode::kSrcOver,
std::move(flip_image_filter),
std::move(input), nullptr);
}
} // namespace PaintFilterBuilder
} // namespace blink
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