chromium/third_party/blink/renderer/platform/graphics/gradient.cc

/*
 * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2007 Alp Toker <[email protected]>
 * Copyright (C) 2013 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
 * 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/gradient.h"

#include <algorithm>
#include <optional>

#include "third_party/blink/renderer/platform/geometry/blend.h"
#include "third_party/blink/renderer/platform/graphics/color.h"
#include "third_party/blink/renderer/platform/graphics/dark_mode_settings_builder.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_shader.h"
#include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h"
#include "third_party/blink/renderer/platform/wtf/wtf_size_t.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkMatrix.h"
#include "third_party/skia/include/core/SkShader.h"
#include "third_party/skia/include/effects/SkGradientShader.h"

namespace blink {

Gradient::Gradient(Type type,
                   GradientSpreadMethod spread_method,
                   ColorInterpolation interpolation,
                   DegenerateHandling degenerate_handling)
    : … { … }

Gradient::~Gradient() = default;

static inline bool CompareStops(const Gradient::ColorStop& a,
                                const Gradient::ColorStop& b) { … }

void Gradient::AddColorStop(const Gradient::ColorStop& stop) { … }

void Gradient::AddColorStops(const Vector<Gradient::ColorStop>& stops) { … }

void Gradient::SortStopsIfNecessary() const { … }

static SkColor4f ResolveStopColorWithMissingParams(
    const Color& color,
    const Color& neighbor,
    Color::ColorSpace color_space,
    const cc::ColorFilter* color_filter) { … }

// Collect sorted stop position and color information into the pos and colors
// buffers, ensuring stops at both 0.0 and 1.0.
// TODO(fmalita): theoretically Skia should provide the same 0.0/1.0 padding
// (making this logic redundant), but in practice there are rendering diffs;
// investigate.
void Gradient::FillSkiaStops(ColorBuffer& colors, OffsetBuffer& pos) const { … }

SkGradientShader::Interpolation Gradient::ResolveSkInterpolation() const { … }

sk_sp<PaintShader> Gradient::CreateShaderInternal(
    const SkMatrix& local_matrix) { … }

void Gradient::ApplyToFlags(cc::PaintFlags& flags,
                            const SkMatrix& local_matrix,
                            const ImageDrawOptions& draw_options) { … }

DarkModeFilter& Gradient::EnsureDarkModeFilter() { … }

namespace {

class LinearGradient final : public Gradient { … };

class RadialGradient final : public Gradient { … };

class ConicGradient final : public Gradient { … };

}  // namespace

scoped_refptr<Gradient> Gradient::CreateLinear(
    const gfx::PointF& p0,
    const gfx::PointF& p1,
    GradientSpreadMethod spread_method,
    ColorInterpolation interpolation,
    DegenerateHandling degenerate_handling) { … }

scoped_refptr<Gradient> Gradient::CreateRadial(
    const gfx::PointF& p0,
    float r0,
    const gfx::PointF& p1,
    float r1,
    float aspect_ratio,
    GradientSpreadMethod spread_method,
    ColorInterpolation interpolation,
    DegenerateHandling degenerate_handling) { … }

scoped_refptr<Gradient> Gradient::CreateConic(
    const gfx::PointF& position,
    float rotation,
    float start_angle,
    float end_angle,
    GradientSpreadMethod spread_method,
    ColorInterpolation interpolation,
    DegenerateHandling degenerate_handling) { … }

}  // namespace blink