ui/gfx: split out code that depends on paint

ui/gfx/skia_util.cc

 // Copyright (c) 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 "ui/gfx/skia_util.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/numerics/safe_conversions.h"
 #include "base/numerics/safe_math.h"
 #include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkColorPriv.h"
 #include "third_party/skia/include/core/SkUnPreMultiply.h"
 #include "third_party/skia/include/effects/SkBlurMaskFilter.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "third_party/skia/include/effects/SkLayerDrawLooper.h"
 #include "ui/gfx/geometry/quad_f.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/image/image_skia_rep.h"
 #include "ui/gfx/shadow_value.h"
@@ skipping 73 matching lines @@
   flattened->set(1, SkMScalarToScalar(transform.matrix().get(0, 1)));
   flattened->set(2, SkMScalarToScalar(transform.matrix().get(0, 3)));
   flattened->set(3, SkMScalarToScalar(transform.matrix().get(1, 0)));
   flattened->set(4, SkMScalarToScalar(transform.matrix().get(1, 1)));
   flattened->set(5, SkMScalarToScalar(transform.matrix().get(1, 3)));
   flattened->set(6, SkMScalarToScalar(transform.matrix().get(3, 0)));
   flattened->set(7, SkMScalarToScalar(transform.matrix().get(3, 1)));
   flattened->set(8, SkMScalarToScalar(transform.matrix().get(3, 3)));
 }
 
-sk_sp<SkShader> CreateImageRepShader(const gfx::ImageSkiaRep& image_rep,
-                                            SkShader::TileMode tile_mode,
-                                            const SkMatrix& local_matrix) {
-  return CreateImageRepShaderForScale(image_rep, tile_mode, local_matrix,
-                                      image_rep.scale());
-}
-
-sk_sp<SkShader> CreateImageRepShaderForScale(
-    const gfx::ImageSkiaRep& image_rep,
-    SkShader::TileMode tile_mode,
-    const SkMatrix& local_matrix,
-    SkScalar scale) {
-  // Unscale matrix by |scale| such that the bitmap is drawn at the
-  // correct density.
-  // Convert skew and translation to pixel coordinates.
-  // Thus, for |bitmap_scale| = 2:
-  //   x scale = 2, x translation = 1 DIP,
-  // should be converted to
-  //   x scale = 1, x translation = 2 pixels.
-  SkMatrix shader_scale = local_matrix;
-  shader_scale.preScale(scale, scale);
-  shader_scale.setScaleX(local_matrix.getScaleX() / scale);
-  shader_scale.setScaleY(local_matrix.getScaleY() / scale);
-
-  return SkShader::MakeBitmapShader(
-      image_rep.sk_bitmap(), tile_mode, tile_mode, &shader_scale);
-}
-
-sk_sp<SkShader> CreateGradientShader(int start_point,
-                                            int end_point,
-                                            SkColor start_color,
-                                            SkColor end_color) {
-  SkColor grad_colors[2] = { start_color, end_color};
-  SkPoint grad_points[2];
-  grad_points[0].iset(0, start_point);
-  grad_points[1].iset(0, end_point);
-
-  return SkGradientShader::MakeLinear(
-      grad_points, grad_colors, NULL, 2, SkShader::kClamp_TileMode);
-}
-
-// TODO(estade): remove. Only exists to support legacy CreateShadowDrawLooper.
-static SkScalar DeprecatedRadiusToSigma(double radius) {
-  // This captures historically what skia did under the hood. Now skia accepts
-  // sigma, not radius, so we perform the conversion.
-  return radius > 0 ? SkDoubleToScalar(0.57735f * radius + 0.5) : 0;
-}
-
-// This is copied from
-// third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h
-static SkScalar RadiusToSigma(double radius) {
-  return radius > 0 ? SkDoubleToScalar(0.288675f * radius + 0.5f) : 0;
-}
-
-sk_sp<SkDrawLooper> CreateShadowDrawLooper(
-    const std::vector<ShadowValue>& shadows) {
-  if (shadows.empty())
-    return nullptr;
-
-  SkLayerDrawLooper::Builder looper_builder;
-
-  looper_builder.addLayer();  // top layer of the original.
-
-  SkLayerDrawLooper::LayerInfo layer_info;
-  layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit;
-  layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
-  layer_info.fColorMode = SkBlendMode::kSrc;
-
-  for (size_t i = 0; i < shadows.size(); ++i) {
-    const ShadowValue& shadow = shadows[i];
-
-    layer_info.fOffset.set(SkIntToScalar(shadow.x()),
-                           SkIntToScalar(shadow.y()));
-
-    SkPaint* paint = looper_builder.addLayer(layer_info);
-    // SkBlurMaskFilter's blur radius defines the range to extend the blur from
-    // original mask, which is half of blur amount as defined in ShadowValue.
-    // Note that because this function uses DeprecatedRadiusToSigma, it actually
-    // creates a draw looper with roughly twice the desired blur.
-    paint->setMaskFilter(SkBlurMaskFilter::Make(
-        kNormal_SkBlurStyle, DeprecatedRadiusToSigma(shadow.blur() / 2),
-        SkBlurMaskFilter::kHighQuality_BlurFlag));
-    paint->setColorFilter(
-        SkColorFilter::MakeModeFilter(shadow.color(), SkBlendMode::kSrcIn));
-  }
-
-  return looper_builder.detach();
-}
-
-sk_sp<SkDrawLooper> CreateShadowDrawLooperCorrectBlur(
-    const std::vector<ShadowValue>& shadows) {
-  if (shadows.empty())
-    return nullptr;
-
-  SkLayerDrawLooper::Builder looper_builder;
-
-  looper_builder.addLayer();  // top layer of the original.
-
-  SkLayerDrawLooper::LayerInfo layer_info;
-  layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit;
-  layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
-  layer_info.fColorMode = SkBlendMode::kSrc;
-
-  for (size_t i = 0; i < shadows.size(); ++i) {
-    const ShadowValue& shadow = shadows[i];
-
-    layer_info.fOffset.set(SkIntToScalar(shadow.x()),
-                           SkIntToScalar(shadow.y()));
-
-    SkPaint* paint = looper_builder.addLayer(layer_info);
-    // SkBlurMaskFilter's blur radius defines the range to extend the blur from
-    // original mask, which is half of blur amount as defined in ShadowValue.
-    paint->setMaskFilter(SkBlurMaskFilter::Make(
-        kNormal_SkBlurStyle, RadiusToSigma(shadow.blur() / 2),
-        SkBlurMaskFilter::kHighQuality_BlurFlag));
-    paint->setColorFilter(
-        SkColorFilter::MakeModeFilter(shadow.color(), SkBlendMode::kSrcIn));
-  }
-
-  return looper_builder.detach();
-}
-
 bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) {
   void* addr1 = NULL;
   void* addr2 = NULL;
   size_t size1 = 0;
   size_t size2 = 0;
 
   bitmap1.lockPixels();
   addr1 = bitmap1.getAddr32(0, 0);
   size1 = bitmap1.getSize();
   bitmap1.unlockPixels();
@@ skipping 48 matching lines @@
   static const SkScalar kSkToHbRatio = SK_Scalar1 / kHbUnit1;
   return kSkToHbRatio * value;
 }
 
 float HarfBuzzUnitsToFloat(int value) {
   static const float kFloatToHbRatio = 1.0f / kHbUnit1;
   return kFloatToHbRatio * value;
 }
 
 }  // namespace gfx