base/gfx/skia_utils_mac.cc

// Copyright (c) 2006-2008 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 "base/gfx/skia_utils_mac.h"

#include "base/logging.h"
#include "SkMatrix.h"
#include "SkRect.h"

namespace gfx {

CGAffineTransform SkMatrixToCGAffineTransform(const SkMatrix& matrix) {
  // CGAffineTransforms don't support perspective transforms, so make sure
  // we don't get those.
  DCHECK(matrix[SkMatrix::kMPersp0] == 0.0f);
  DCHECK(matrix[SkMatrix::kMPersp1] == 0.0f);
  DCHECK(matrix[SkMatrix::kMPersp2] == 1.0f);
  
  return CGAffineTransformMake(matrix[SkMatrix::kMScaleX],
                               matrix[SkMatrix::kMSkewY],
                               matrix[SkMatrix::kMSkewX],
                               matrix[SkMatrix::kMScaleY],
                               matrix[SkMatrix::kMTransX],
                               matrix[SkMatrix::kMTransY]);
}
  
SkIRect CGRectToSkIRect(const CGRect& rect) {
  SkIRect sk_rect = {
    SkScalarRound(rect.origin.x),
    SkScalarRound(rect.origin.y),
    SkScalarRound(rect.origin.x + rect.size.width),
    SkScalarRound(rect.origin.y + rect.size.height)
  };
  return sk_rect;
}

SkRect CGRectToSkRect(const CGRect& rect) {
  SkRect sk_rect = {
    rect.origin.x,
    rect.origin.y,
    rect.origin.x + rect.size.width,
    rect.origin.y + rect.size.height,
  };
  return sk_rect;
}
  
CGRect SkIRectToCGRect(const SkIRect& rect) {
  CGRect cg_rect = {
    { rect.fLeft, rect.fTop },
    { rect.fRight - rect.fLeft, rect.fBottom - rect.fTop }
  };
  return cg_rect;
} 

CGRect SkRectToCGRect(const SkRect& rect) {
  CGRect cg_rect = {
    { rect.fLeft, rect.fTop },
    { rect.fRight - rect.fLeft, rect.fBottom - rect.fTop }
  };
  return cg_rect;
}

// Converts CGColorRef to the ARGB layout Skia expects.
SkColor CGColorRefToSkColor(CGColorRef color) {
  DCHECK(CGColorGetNumberOfComponents(color) == 4);
  const CGFloat *components = CGColorGetComponents(color);
  return SkColorSetARGB(SkScalarRound(255.0 * components[3]), // alpha
                        SkScalarRound(255.0 * components[0]), // red
                        SkScalarRound(255.0 * components[1]), // green
                        SkScalarRound(255.0 * components[2])); // blue
}

// Converts ARGB to CGColorRef.
CGColorRef SkColorToCGColorRef(SkColor color) {
  return CGColorCreateGenericRGB(SkColorGetR(color) / 255.0,
                                 SkColorGetG(color) / 255.0,
                                 SkColorGetB(color) / 255.0,
                                 SkColorGetA(color) / 255.0);
}

}  // namespace gfx