| // 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 "cc/output/render_surface_filters.h" |
| |
| #include <algorithm> |
| |
| #include "cc/output/filter_operation.h" |
| #include "cc/output/filter_operations.h" |
| #include "skia/ext/refptr.h" |
| #include "third_party/skia/include/core/SkImageFilter.h" |
| #include "third_party/skia/include/effects/SkAlphaThresholdFilter.h" |
| #include "third_party/skia/include/effects/SkBlurImageFilter.h" |
| #include "third_party/skia/include/effects/SkColorFilterImageFilter.h" |
| #include "third_party/skia/include/effects/SkColorMatrixFilter.h" |
| #include "third_party/skia/include/effects/SkComposeImageFilter.h" |
| #include "third_party/skia/include/effects/SkDropShadowImageFilter.h" |
| #include "third_party/skia/include/effects/SkMagnifierImageFilter.h" |
| #include "third_party/skia/include/effects/SkRectShaderImageFilter.h" |
| #include "ui/gfx/geometry/size_f.h" |
| |
| namespace cc { |
| |
| namespace { |
| |
| void GetBrightnessMatrix(float amount, SkScalar 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(SkScalar)); |
| matrix[0] = matrix[6] = matrix[12] = amount; |
| matrix[18] = 1.f; |
| } |
| |
| void GetSaturatingBrightnessMatrix(float amount, SkScalar matrix[20]) { |
| // Legacy implementation used by internal clients. |
| // <feFunc[R|G|B] type="linear" intercept="[amount]"/> |
| memset(matrix, 0, 20 * sizeof(SkScalar)); |
| matrix[0] = matrix[6] = matrix[12] = matrix[18] = 1.f; |
| matrix[4] = matrix[9] = matrix[14] = amount * 255.f; |
| } |
| |
| void GetContrastMatrix(float amount, SkScalar matrix[20]) { |
| memset(matrix, 0, 20 * sizeof(SkScalar)); |
| matrix[0] = matrix[6] = matrix[12] = amount; |
| matrix[4] = matrix[9] = matrix[14] = (-0.5f * amount + 0.5f) * 255.f; |
| matrix[18] = 1.f; |
| } |
| |
| void GetSaturateMatrix(float amount, SkScalar 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, SkScalar matrix[20]) { |
| const float kPi = 3.1415926535897932384626433832795f; |
| |
| float cos_hue = cosf(hue * kPi / 180.f); |
| float sin_hue = sinf(hue * kPi / 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, SkScalar matrix[20]) { |
| memset(matrix, 0, 20 * sizeof(SkScalar)); |
| matrix[0] = matrix[6] = matrix[12] = 1.f - 2.f * amount; |
| matrix[4] = matrix[9] = matrix[14] = amount * 255.f; |
| matrix[18] = 1.f; |
| } |
| |
| void GetOpacityMatrix(float amount, SkScalar matrix[20]) { |
| memset(matrix, 0, 20 * sizeof(SkScalar)); |
| matrix[0] = matrix[6] = matrix[12] = 1.f; |
| matrix[18] = amount; |
| } |
| |
| void GetGrayscaleMatrix(float amount, SkScalar 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, SkScalar 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; |
| } |
| |
| skia::RefPtr<SkImageFilter> CreateMatrixImageFilter( |
| const SkScalar matrix[20], |
| const skia::RefPtr<SkImageFilter>& input) { |
| skia::RefPtr<SkColorFilter> color_filter = |
| skia::AdoptRef(SkColorMatrixFilter::Create(matrix)); |
| return skia::AdoptRef( |
| SkColorFilterImageFilter::Create(color_filter.get(), input.get())); |
| } |
| |
| } // namespace |
| |
| skia::RefPtr<SkImageFilter> RenderSurfaceFilters::BuildImageFilter( |
| const FilterOperations& filters, |
| const gfx::SizeF& size) { |
| skia::RefPtr<SkImageFilter> image_filter; |
| SkScalar 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, image_filter); |
| break; |
| case FilterOperation::SEPIA: |
| GetSepiaMatrix(1.f - op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::SATURATE: |
| GetSaturateMatrix(op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::HUE_ROTATE: |
| GetHueRotateMatrix(op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::INVERT: |
| GetInvertMatrix(op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::OPACITY: |
| GetOpacityMatrix(op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::BRIGHTNESS: |
| GetBrightnessMatrix(op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::CONTRAST: |
| GetContrastMatrix(op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::BLUR: |
| image_filter = skia::AdoptRef(SkBlurImageFilter::Create( |
| op.amount(), op.amount(), image_filter.get())); |
| break; |
| case FilterOperation::DROP_SHADOW: |
| image_filter = skia::AdoptRef(SkDropShadowImageFilter::Create( |
| SkIntToScalar(op.drop_shadow_offset().x()), |
| SkIntToScalar(op.drop_shadow_offset().y()), |
| SkIntToScalar(op.amount()), |
| SkIntToScalar(op.amount()), |
| op.drop_shadow_color(), |
| image_filter.get())); |
| break; |
| case FilterOperation::COLOR_MATRIX: |
| image_filter = CreateMatrixImageFilter(op.matrix(), image_filter); |
| break; |
| case FilterOperation::ZOOM: { |
| skia::RefPtr<SkImageFilter> zoom_filter = |
| skia::AdoptRef(SkMagnifierImageFilter::Create( |
| SkRect::MakeXYWH( |
| (size.width() - (size.width() / op.amount())) / 2.f, |
| (size.height() - (size.height() / op.amount())) / 2.f, |
| size.width() / op.amount(), |
| size.height() / op.amount()), |
| op.zoom_inset())); |
| if (image_filter.get()) { |
| // 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 = skia::AdoptRef(SkComposeImageFilter::Create( |
| zoom_filter.get(), image_filter.get())); |
| } else { |
| image_filter = zoom_filter; |
| } |
| break; |
| } |
| case FilterOperation::SATURATING_BRIGHTNESS: |
| GetSaturatingBrightnessMatrix(op.amount(), matrix); |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| break; |
| case FilterOperation::REFERENCE: { |
| if (!op.image_filter()) |
| break; |
| |
| skia::RefPtr<SkColorFilter> cf; |
| |
| { |
| SkColorFilter* colorfilter_rawptr = NULL; |
| op.image_filter()->asColorFilter(&colorfilter_rawptr); |
| cf = skia::AdoptRef(colorfilter_rawptr); |
| } |
| |
| if (cf && cf->asColorMatrix(matrix) && |
| !op.image_filter()->getInput(0)) { |
| image_filter = CreateMatrixImageFilter(matrix, image_filter); |
| } else if (image_filter) { |
| image_filter = skia::AdoptRef(SkComposeImageFilter::Create( |
| op.image_filter().get(), image_filter.get())); |
| } else { |
| image_filter = op.image_filter(); |
| } |
| break; |
| } |
| case FilterOperation::ALPHA_THRESHOLD: { |
| skia::RefPtr<SkImageFilter> alpha_filter = skia::AdoptRef( |
| SkAlphaThresholdFilter::Create( |
| op.region(), op.amount(), op.outer_threshold())); |
| if (image_filter.get()) { |
| image_filter = skia::AdoptRef(SkComposeImageFilter::Create( |
| alpha_filter.get(), image_filter.get())); |
| } else { |
| image_filter = alpha_filter; |
| } |
| break; |
| } |
| } |
| } |
| return image_filter; |
| } |
| |
| } // namespace cc |