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- // Copyright 2012 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 <stddef.h>
- #include <algorithm>
- #include <utility>
- #include "cc/paint/render_surface_filters.h"
- #include "base/numerics/math_constants.h"
- #include "cc/paint/filter_operation.h"
- #include "cc/paint/filter_operations.h"
- #include "cc/paint/paint_filter.h"
- #include "third_party/skia/include/core/SkColorFilter.h"
- #include "third_party/skia/include/core/SkRegion.h"
- #include "ui/gfx/geometry/size_f.h"
- #include "ui/gfx/geometry/skia_conversions.h"
- namespace cc {
- namespace {
- void GetBrightnessMatrix(float amount, float matrix[20]) {
- // Spec implementation
- // (http://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#brightnessEquivalent)
- // <feFunc[R|G|B] type="linear" slope="[amount]">
- memset(matrix, 0, 20 * sizeof(float));
- matrix[0] = matrix[6] = matrix[12] = amount;
- matrix[18] = 1.f;
- }
- void GetSaturatingBrightnessMatrix(float amount, float matrix[20]) {
- // Legacy implementation used by internal clients.
- // <feFunc[R|G|B] type="linear" intercept="[amount]"/>
- memset(matrix, 0, 20 * sizeof(float));
- matrix[0] = matrix[6] = matrix[12] = matrix[18] = 1.f;
- matrix[4] = matrix[9] = matrix[14] = amount;
- }
- void GetContrastMatrix(float amount, float matrix[20]) {
- memset(matrix, 0, 20 * sizeof(float));
- matrix[0] = matrix[6] = matrix[12] = amount;
- matrix[4] = matrix[9] = matrix[14] = (-0.5f * amount + 0.5f);
- matrix[18] = 1.f;
- }
- void GetSaturateMatrix(float amount, float matrix[20]) {
- // Note, these values are computed to ensure MatrixNeedsClamping is false
- // for amount in [0..1]
- matrix[0] = 0.213f + 0.787f * amount;
- matrix[1] = 0.715f - 0.715f * amount;
- matrix[2] = 1.f - (matrix[0] + matrix[1]);
- matrix[3] = matrix[4] = 0.f;
- matrix[5] = 0.213f - 0.213f * amount;
- matrix[6] = 0.715f + 0.285f * amount;
- matrix[7] = 1.f - (matrix[5] + matrix[6]);
- matrix[8] = matrix[9] = 0.f;
- matrix[10] = 0.213f - 0.213f * amount;
- matrix[11] = 0.715f - 0.715f * amount;
- matrix[12] = 1.f - (matrix[10] + matrix[11]);
- matrix[13] = matrix[14] = 0.f;
- matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0.f;
- matrix[18] = 1.f;
- }
- void GetHueRotateMatrix(float hue, float matrix[20]) {
- float cos_hue = cosf(hue * base::kPiFloat / 180.f);
- float sin_hue = sinf(hue * base::kPiFloat / 180.f);
- matrix[0] = 0.213f + cos_hue * 0.787f - sin_hue * 0.213f;
- matrix[1] = 0.715f - cos_hue * 0.715f - sin_hue * 0.715f;
- matrix[2] = 0.072f - cos_hue * 0.072f + sin_hue * 0.928f;
- matrix[3] = matrix[4] = 0.f;
- matrix[5] = 0.213f - cos_hue * 0.213f + sin_hue * 0.143f;
- matrix[6] = 0.715f + cos_hue * 0.285f + sin_hue * 0.140f;
- matrix[7] = 0.072f - cos_hue * 0.072f - sin_hue * 0.283f;
- matrix[8] = matrix[9] = 0.f;
- matrix[10] = 0.213f - cos_hue * 0.213f - sin_hue * 0.787f;
- matrix[11] = 0.715f - cos_hue * 0.715f + sin_hue * 0.715f;
- matrix[12] = 0.072f + cos_hue * 0.928f + sin_hue * 0.072f;
- matrix[13] = matrix[14] = 0.f;
- matrix[15] = matrix[16] = matrix[17] = 0.f;
- matrix[18] = 1.f;
- matrix[19] = 0.f;
- }
- void GetInvertMatrix(float amount, float matrix[20]) {
- memset(matrix, 0, 20 * sizeof(float));
- matrix[0] = matrix[6] = matrix[12] = 1.f - 2.f * amount;
- matrix[4] = matrix[9] = matrix[14] = amount;
- matrix[18] = 1.f;
- }
- void GetOpacityMatrix(float amount, float matrix[20]) {
- memset(matrix, 0, 20 * sizeof(float));
- matrix[0] = matrix[6] = matrix[12] = 1.f;
- matrix[18] = amount;
- }
- void GetGrayscaleMatrix(float amount, float matrix[20]) {
- // Note, these values are computed to ensure MatrixNeedsClamping is false
- // for amount in [0..1]
- matrix[0] = 0.2126f + 0.7874f * amount;
- matrix[1] = 0.7152f - 0.7152f * amount;
- matrix[2] = 1.f - (matrix[0] + matrix[1]);
- matrix[3] = matrix[4] = 0.f;
- matrix[5] = 0.2126f - 0.2126f * amount;
- matrix[6] = 0.7152f + 0.2848f * amount;
- matrix[7] = 1.f - (matrix[5] + matrix[6]);
- matrix[8] = matrix[9] = 0.f;
- matrix[10] = 0.2126f - 0.2126f * amount;
- matrix[11] = 0.7152f - 0.7152f * amount;
- matrix[12] = 1.f - (matrix[10] + matrix[11]);
- matrix[13] = matrix[14] = 0.f;
- matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0.f;
- matrix[18] = 1.f;
- }
- void GetSepiaMatrix(float amount, float matrix[20]) {
- matrix[0] = 0.393f + 0.607f * amount;
- matrix[1] = 0.769f - 0.769f * amount;
- matrix[2] = 0.189f - 0.189f * amount;
- matrix[3] = matrix[4] = 0.f;
- matrix[5] = 0.349f - 0.349f * amount;
- matrix[6] = 0.686f + 0.314f * amount;
- matrix[7] = 0.168f - 0.168f * amount;
- matrix[8] = matrix[9] = 0.f;
- matrix[10] = 0.272f - 0.272f * amount;
- matrix[11] = 0.534f - 0.534f * amount;
- matrix[12] = 0.131f + 0.869f * amount;
- matrix[13] = matrix[14] = 0.f;
- matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0.f;
- matrix[18] = 1.f;
- }
- sk_sp<PaintFilter> CreateMatrixImageFilter(const float matrix[20],
- sk_sp<PaintFilter> input) {
- auto color_filter = SkColorFilters::Matrix(matrix);
- if (!color_filter)
- return nullptr;
- return sk_make_sp<ColorFilterPaintFilter>(std::move(color_filter),
- std::move(input));
- }
- } // namespace
- sk_sp<PaintFilter> RenderSurfaceFilters::BuildImageFilter(
- const FilterOperations& filters,
- const gfx::SizeF& size,
- const gfx::Vector2dF& offset) {
- sk_sp<PaintFilter> image_filter;
- float matrix[20];
- for (size_t i = 0; i < filters.size(); ++i) {
- const FilterOperation& op = filters.at(i);
- switch (op.type()) {
- case FilterOperation::GRAYSCALE:
- GetGrayscaleMatrix(1.f - op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::SEPIA:
- GetSepiaMatrix(1.f - op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::SATURATE:
- GetSaturateMatrix(op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::HUE_ROTATE:
- GetHueRotateMatrix(op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::INVERT:
- GetInvertMatrix(op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::OPACITY:
- GetOpacityMatrix(op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::BRIGHTNESS:
- GetBrightnessMatrix(op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::CONTRAST:
- GetContrastMatrix(op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::BLUR:
- image_filter = sk_make_sp<BlurPaintFilter>(op.amount(), op.amount(),
- op.blur_tile_mode(),
- std::move(image_filter));
- break;
- case FilterOperation::DROP_SHADOW:
- image_filter = sk_make_sp<DropShadowPaintFilter>(
- SkIntToScalar(op.drop_shadow_offset().x()),
- SkIntToScalar(op.drop_shadow_offset().y()),
- SkIntToScalar(op.amount()), SkIntToScalar(op.amount()),
- op.drop_shadow_color(),
- DropShadowPaintFilter::ShadowMode::kDrawShadowAndForeground,
- std::move(image_filter));
- break;
- case FilterOperation::COLOR_MATRIX:
- image_filter =
- CreateMatrixImageFilter(op.matrix(), std::move(image_filter));
- break;
- case FilterOperation::ZOOM: {
- // The center point, always the midpoint of the unclipped rectangle.
- // When we go to either edge of the screen, the width/height will shrink
- // at the same rate the offset changes. Use abs on the offset since we
- // do not care about the offset direction.
- gfx::Vector2dF center =
- gfx::Vector2dF((size.width() + std::abs(offset.x())) / 2,
- (size.height() + std::abs(offset.y())) / 2);
- // The dimensions of the source content. This shrinks as the texture
- // rectangle gets clipped.
- gfx::Vector2d src_dimensions =
- gfx::Vector2d((size.width() + std::abs(offset.x())) / op.amount(),
- (size.height() + std::abs(offset.y())) / op.amount());
- // When the magnifier goes to the left/top border of the screen, we need
- // to adjust the x/y position of the rect. The rate the position gets
- // updated currently only works properly for a 2x magnification.
- DCHECK_EQ(op.amount(), 2.f);
- gfx::Vector2dF center_offset = gfx::Vector2dF(0, 0);
- if (offset.x() >= 0)
- center_offset.set_x(-offset.x() / op.amount());
- if (offset.y() <= 0)
- center_offset.set_y(offset.y() / op.amount());
- sk_sp<PaintFilter> zoom_filter = sk_make_sp<MagnifierPaintFilter>(
- SkRect::MakeXYWH(
- (center.x() - src_dimensions.x() / 2.f) + center_offset.x(),
- (center.y() - src_dimensions.y() / 2.f) + center_offset.y(),
- size.width() / op.amount(), size.height() / op.amount()),
- op.zoom_inset(), nullptr);
- if (image_filter) {
- // TODO(ajuma): When there's a 1-input version of
- // SkMagnifierImageFilter, use that to handle the input filter
- // instead of using an SkComposeImageFilter.
- image_filter = sk_make_sp<ComposePaintFilter>(
- std::move(zoom_filter), std::move(image_filter));
- } else {
- image_filter = std::move(zoom_filter);
- }
- break;
- }
- case FilterOperation::SATURATING_BRIGHTNESS:
- GetSaturatingBrightnessMatrix(op.amount(), matrix);
- image_filter = CreateMatrixImageFilter(matrix, std::move(image_filter));
- break;
- case FilterOperation::REFERENCE: {
- if (!op.image_filter())
- break;
- sk_sp<SkColorFilter> cf;
- bool has_input = false;
- if (op.image_filter()->type() == PaintFilter::Type::kColorFilter &&
- !op.image_filter()->GetCropRect()) {
- auto* color_paint_filter =
- static_cast<ColorFilterPaintFilter*>(op.image_filter().get());
- cf = color_paint_filter->color_filter();
- has_input = !!color_paint_filter->input();
- }
- if (cf && cf->asAColorMatrix(matrix) && !has_input) {
- image_filter =
- CreateMatrixImageFilter(matrix, std::move(image_filter));
- } else if (image_filter) {
- image_filter = sk_make_sp<ComposePaintFilter>(
- op.image_filter(), std::move(image_filter));
- } else {
- image_filter = op.image_filter();
- }
- break;
- }
- case FilterOperation::ALPHA_THRESHOLD: {
- SkRegion region;
- for (const gfx::Rect& rect : op.shape())
- region.op(gfx::RectToSkIRect(rect), SkRegion::kUnion_Op);
- sk_sp<PaintFilter> alpha_filter = sk_make_sp<AlphaThresholdPaintFilter>(
- region, op.amount(), op.outer_threshold(), nullptr);
- if (image_filter) {
- image_filter = sk_make_sp<ComposePaintFilter>(
- std::move(alpha_filter), std::move(image_filter));
- } else {
- image_filter = std::move(alpha_filter);
- }
- break;
- }
- case FilterOperation::STRETCH: {
- image_filter = sk_make_sp<StretchPaintFilter>(
- op.amount(), op.outer_threshold(), size.width(), size.height(),
- std::move(image_filter));
- break;
- }
- }
- }
- return image_filter;
- }
- } // namespace cc
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