chromium/src/third_party/blink/renderer/platform/graphics/generated_image.cc

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
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#include "third_party/blink/renderer/platform/graphics/generated_image.h"

#include "third_party/blink/renderer/platform/geometry/float_rect.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_controller.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_image.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_record.h"

namespace blink {

void GeneratedImage::DrawPattern(
    GraphicsContext& dest_context,
    const FloatRect& src_rect,
    const FloatSize& scale,
    const FloatPoint& phase,
    SkBlendMode composite_op,
    const FloatRect& dest_rect,
    const FloatSize& repeat_spacing,
    RespectImageOrientationEnum respect_orientation) {
  FloatRect tile_rect = src_rect;
  tile_rect.Expand(repeat_spacing);

  SkMatrix pattern_matrix = SkMatrix::Translate(phase.X(), phase.Y());
  pattern_matrix.preScale(scale.Width(), scale.Height());
  pattern_matrix.preTranslate(tile_rect.X(), tile_rect.Y());

  sk_sp<PaintShader> tile_shader =
      CreateShader(tile_rect, &pattern_matrix, src_rect, respect_orientation);

  PaintFlags fill_flags = dest_context.FillFlags();
  fill_flags.setShader(std::move(tile_shader));
  fill_flags.setColor(SK_ColorBLACK);
  fill_flags.setBlendMode(composite_op);

  dest_context.DrawRect(dest_rect, fill_flags);
}

sk_sp<PaintShader> GeneratedImage::CreateShader(
    const FloatRect& tile_rect,
    const SkMatrix* pattern_matrix,
    const FloatRect& src_rect,
    RespectImageOrientationEnum respect_orientation) {
  auto paint_controller =
      std::make_unique<PaintController>(PaintController::kTransient);
  GraphicsContext context(*paint_controller);
  context.BeginRecording(tile_rect);
  DrawTile(context, src_rect, respect_orientation);
  sk_sp<PaintRecord> record = context.EndRecording();

  return PaintShader::MakePaintRecord(std::move(record), tile_rect,
                                      SkTileMode::kRepeat, SkTileMode::kRepeat,
                                      pattern_matrix);
}

PaintImage GeneratedImage::PaintImageForCurrentFrame() {
  return PaintImage();
}

}  // namespace blink