Move PlatformCanvas and PlatformDevice from base/gfx to webkit/port. I left h...

base/gfx/platform_device_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/platform_device_mac.h"
-
-#include "base/logging.h"
-#include "base/gfx/skia_utils_mac.h"
-#include "SkMatrix.h"
-#include "SkPath.h"
-#include "SkUtils.h"
-
-namespace gfx {
-
-namespace {
-
-// Constrains position and size to fit within available_size.
-bool constrain(int available_size, int* position, int *size) {
-  if (*position < 0) {
-    *size += *position;
-    *position = 0;
-  }
-  if (*size > 0 && *position < available_size) {
-    int overflow = (*position + *size) - available_size;
-    if (overflow > 0) {
-      *size -= overflow;
-    }
-    return true;
-  }
-  return false;
-}
-
-// Sets the opacity of the specified value to 0xFF.
-void makeOpaqueAlphaAdjuster(uint32_t* pixel) {
-  *pixel |= 0xFF000000;
-}
-
-} // namespace
-
-PlatformDeviceMac::PlatformDeviceMac(const SkBitmap& bitmap)
-    : SkDevice(bitmap) {
-}
-
-void PlatformDeviceMac::makeOpaque(int x, int y, int width, int height) {
-  processPixels(x, y, width, height, makeOpaqueAlphaAdjuster);
-}
-
-// Set up the CGContextRef for peaceful coexistence with Skia
-void PlatformDeviceMac::InitializeCGContext(CGContextRef context) {
-  // CG defaults to the same settings as Skia
-}
-
-// static
-void PlatformDeviceMac::LoadPathToCGContext(CGContextRef context,
-                                            const SkPath& path) {
-  // instead of a persistent attribute of the context, CG specifies the fill
-  // type per call, so we just have to load up the geometry.
-  CGContextBeginPath(context);
-
-  SkPoint points[4] = { {0, 0}, {0, 0}, {0, 0}, {0, 0} };
-  SkPath::Iter iter(path, false);
-  for (SkPath::Verb verb = iter.next(points); verb != SkPath::kDone_Verb;
-       verb = iter.next(points)) {
-    switch (verb) {
-      case SkPath::kMove_Verb: {  // iter.next returns 1 point
-        CGContextMoveToPoint(context, points[0].fX, points[0].fY);
-        break;
-      }
-      case SkPath::kLine_Verb: {  // iter.next returns 2 points
-        CGContextAddLineToPoint(context, points[1].fX, points[1].fY);
-        break;
-      }
-      case SkPath::kQuad_Verb: {  // iter.next returns 3 points
-        CGContextAddQuadCurveToPoint(context, points[1].fX, points[1].fY,
-                                     points[2].fX, points[2].fY);
-        break;
-      }
-      case SkPath::kCubic_Verb: {  // iter.next returns 4 points
-        CGContextAddCurveToPoint(context, points[1].fX, points[1].fY,
-                                 points[2].fX, points[2].fY,
-                                 points[3].fX, points[3].fY);
-        break;
-      }
-      case SkPath::kClose_Verb: {  // iter.next returns 1 point (the last point)
-        break;
-      }
-      case SkPath::kDone_Verb:  // iter.next returns 0 points
-      default: {
-        NOTREACHED();
-        break;
-      }
-    }
-  }
-  CGContextClosePath(context);
-}
-
-// static
-void PlatformDeviceMac::LoadTransformToCGContext(CGContextRef context,
-                                                 const SkMatrix& matrix) {
-  // CoreGraphics can concatenate transforms, but not reset the current one.
-  // So in order to get the required behavior here, we need to first make
-  // the current transformation matrix identity and only then load the new one.
-  
-  // Reset matrix to identity.
-  CGAffineTransform orig_cg_matrix = CGContextGetCTM(context);
-  CGAffineTransform orig_cg_matrix_inv = CGAffineTransformInvert(orig_cg_matrix);
-  CGContextConcatCTM(context, orig_cg_matrix_inv);
-  
-  // assert that we have indeed returned to the identity Matrix.
-  DCHECK(CGAffineTransformIsIdentity(CGContextGetCTM(context)));
-  
-  // Convert xform to CG-land.
-  // Our coordinate system is flipped to match WebKit's so we need to modify
-  // the xform to match that.
-  SkMatrix transformed_matrix = matrix;
-  SkScalar sy = matrix.getScaleY() * (SkScalar)-1;
-  transformed_matrix.setScaleY(sy);
-  size_t height = CGBitmapContextGetHeight(context);
-  SkScalar ty = -matrix.getTranslateY(); // y axis is flipped.
-  transformed_matrix.setTranslateY(ty + (SkScalar)height);
-  
-  CGAffineTransform cg_matrix = SkMatrixToCGAffineTransform(transformed_matrix);
-  
-  // Load final transform into context.
-  CGContextConcatCTM(context, cg_matrix);
-}
-
-// static
-void PlatformDeviceMac::LoadClippingRegionToCGContext(
-         CGContextRef context,
-         const SkRegion& region,
-         const SkMatrix& transformation) {
-  if (region.isEmpty()) {
-    // region can be empty, in which case everything will be clipped.
-    SkRect rect;
-    rect.setEmpty();
-    CGContextClipToRect(context, SkRectToCGRect(rect));
-  } else if (region.isRect()) {
-    // Do the transformation.
-    SkRect rect;
-    rect.set(region.getBounds());
-    transformation.mapRect(&rect);
-    SkIRect irect;
-    rect.round(&irect);
-    CGContextClipToRect(context, SkIRectToCGRect(irect));
-  } else {
-    // It is complex.
-    SkPath path;
-    region.getBoundaryPath(&path);
-    // Clip. Note that windows clipping regions are not affected by the
-    // transform so apply it manually.
-    path.transform(transformation);
-    // TODO(playmobil): Implement.
-    NOTREACHED();
-    // LoadPathToDC(context, path);
-    // hrgn = PathToRegion(context);
-  }
-}
-  
-}  // namespace gfx
-