Delete Mac & Cairo skia::BitmapPlatformDevice impls

skia/ext/bitmap_platform_device_mac.cc

Index: skia/ext/bitmap_platform_device_mac.cc
diff --git a/skia/ext/bitmap_platform_device_mac.cc b/skia/ext/bitmap_platform_device_mac.cc
deleted file mode 100644
index 67ad2a9fa2354d271ed43748dda0b5c94b67a260..0000000000000000000000000000000000000000
--- a/skia/ext/bitmap_platform_device_mac.cc
+++ /dev/null
@@ -1,275 +0,0 @@
-// 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 "skia/ext/bitmap_platform_device_mac.h"
-
-#import <ApplicationServices/ApplicationServices.h>
-#include <stddef.h>
-#include <time.h>
-
-#include "base/mac/mac_util.h"
-#include "base/memory/ref_counted.h"
-#include "skia/ext/bitmap_platform_device.h"
-#include "skia/ext/platform_canvas.h"
-#include "skia/ext/skia_utils_mac.h"
-#include "third_party/skia/include/core/SkMatrix.h"
-#include "third_party/skia/include/core/SkPath.h"
-#include "third_party/skia/include/core/SkRect.h"
-#include "third_party/skia/include/core/SkTypes.h"
-
-namespace skia {
-
-namespace {
-
-// Returns true if it is unsafe to attempt to allocate an offscreen buffer
-// given these dimensions.
-bool RasterDeviceTooBigToAllocate(int width, int height) {
-
-#ifndef SKIA_EXT_RASTER_DEVICE_ALLOCATION_MAX
-#define SKIA_EXT_RASTER_DEVICE_ALLOCATION_MAX    (2 * 256 * 1024 * 1024)
-#endif
-
-    int bytesPerPixel = 4;
-    int64_t bytes = (int64_t)width * height * bytesPerPixel;
-    return bytes > SKIA_EXT_RASTER_DEVICE_ALLOCATION_MAX;
-}
-
-static CGContextRef CGContextForData(void* data, int width, int height) {
-#define HAS_ARGB_SHIFTS(a, r, g, b) \
-            (SK_A32_SHIFT == (a) && SK_R32_SHIFT == (r) \
-             && SK_G32_SHIFT == (g) && SK_B32_SHIFT == (b))
-#if defined(SK_CPU_LENDIAN) && HAS_ARGB_SHIFTS(24, 16, 8, 0)
-  // Allocate a bitmap context with 4 components per pixel (BGRA).  Apple
-  // recommends these flags for improved CG performance.
-
-  // CGBitmapContextCreate returns NULL if width/height are 0. However, our
-  // callers expect to get a canvas back (which they later resize/reallocate)
-  // so we pin the dimensions here.
-  width = SkMax32(1, width);
-  height = SkMax32(1, height);
-  CGContextRef context =
-      CGBitmapContextCreate(data, width, height, 8, width * 4,
-                            base::mac::GetSystemColorSpace(),
-                            kCGImageAlphaPremultipliedFirst |
-                                kCGBitmapByteOrder32Host);
-#else
-#error We require that Skia's and CoreGraphics's recommended \
-       image memory layout match.
-#endif
-#undef HAS_ARGB_SHIFTS
-
-  if (!context)
-    return NULL;
-
-  // Change the coordinate system to match WebCore's
-  CGContextTranslateCTM(context, 0, height);
-  CGContextScaleCTM(context, 1.0, -1.0);
-
-  return context;
-}
-
-}  // namespace
-
-void BitmapPlatformDevice::ReleaseBitmapContext() {
-  SkASSERT(bitmap_context_);
-  CGContextRelease(bitmap_context_);
-  bitmap_context_ = NULL;
-}
-
-// Loads the specified Skia transform into the device context
-static void 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.
-  SkASSERT(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();
-  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 =
-      skia::SkMatrixToCGAffineTransform(transformed_matrix);
-
-  // Load final transform into context.
-  CGContextConcatCTM(context, cg_matrix);
-}
-
-static void LoadClippingRegionToCGContext(CGContextRef context,
-                                          const SkIRect& clip_bounds,
-                                          const SkMatrix& transformation) {
-  // CoreGraphics applies the current transform to clip rects, which is
-  // unwanted. Inverse-transform the rect before sending it to CG. This only
-  // works for translations and scaling, but not for rotations (but the
-  // viewport is never rotated anyway).
-  SkMatrix t;
-  bool did_invert = transformation.invert(&t);
-  if (!did_invert)
-    t.reset();
-
-  SkRect rect = SkRect::Make(clip_bounds);
-  t.mapRect(&rect);
-  SkIRect irect;
-  rect.round(&irect);
-  CGContextClipToRect(context, skia::SkIRectToCGRect(irect));
-}
-
-void BitmapPlatformDevice::LoadConfig(const SkMatrix& transform,
-                                      const SkIRect& clip_bounds) {
-  if (!bitmap_context_)
-    return;  // Nothing to do.
-
-  // We must restore and then save the state of the graphics context since the
-  // calls to Load the clipping region to the context are strictly cummulative,
-  // i.e., you can't replace a clip rect, other than with a save/restore.
-  // But this implies that no other changes to the state are done elsewhere.
-  // If we ever get to need to change this, then we must replace the clip rect
-  // calls in LoadClippingRegionToCGContext() with an image mask instead.
-  CGContextRestoreGState(bitmap_context_);
-  CGContextSaveGState(bitmap_context_);
-  LoadTransformToCGContext(bitmap_context_, transform);
-  LoadClippingRegionToCGContext(bitmap_context_, clip_bounds, transform);
-}
-
-
-// We use this static factory function instead of the regular constructor so
-// that we can create the pixel data before calling the constructor. This is
-// required so that we can call the base class' constructor with the pixel
-// data.
-BitmapPlatformDevice* BitmapPlatformDevice::Create(CGContextRef context,
-                                                   int width,
-                                                   int height,
-                                                   bool is_opaque,
-                                                   bool do_clear) {
-  if (RasterDeviceTooBigToAllocate(width, height))
-    return NULL;
-
-  SkBitmap bitmap;
-  // TODO: verify that the CG Context's pixels will have tight rowbytes or pass in the correct
-  // rowbytes for the case when context != NULL.
-  bitmap.setInfo(SkImageInfo::MakeN32(width, height, is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType));
-
-  void* data;
-  if (context) {
-    data = CGBitmapContextGetData(context);
-    bitmap.setPixels(data);
-  } else {
-    if (!bitmap.tryAllocPixels())
-      return NULL;
-    data = bitmap.getPixels();
-  }
-  if (do_clear)
-    memset(data, 0, bitmap.getSafeSize());
-
-  // If we were given data, then don't clobber it!
-#ifndef NDEBUG
-  if (!context && is_opaque) {
-    // To aid in finding bugs, we set the background color to something
-    // obviously wrong so it will be noticable when it is not cleared
-    bitmap.eraseARGB(255, 0, 255, 128);  // bright bluish green
-  }
-#endif
-
-  if (!context) {
-    context = CGContextForData(data, width, height);
-    if (!context)
-      return NULL;
-  } else
-    CGContextRetain(context);
-
-  BitmapPlatformDevice* rv = new BitmapPlatformDevice(context, bitmap);
-
-  // The device object took ownership of the graphics context with its own
-  // CGContextRetain call.
-  CGContextRelease(context);
-
-  return rv;
-}
-
-BitmapPlatformDevice* BitmapPlatformDevice::CreateWithData(uint8_t* data,
-                                                           int width,
-                                                           int height,
-                                                           bool is_opaque) {
-  CGContextRef context = NULL;
-  if (data)
-    context = CGContextForData(data, width, height);
-
-  BitmapPlatformDevice* rv = Create(context, width, height, is_opaque, false);
-
-  // The device object took ownership of the graphics context with its own
-  // CGContextRetain call.
-  if (context)
-    CGContextRelease(context);
-
-  return rv;
-}
-
-// The device will own the bitmap, which corresponds to also owning the pixel
-// data. Therefore, we do not transfer ownership to the SkBitmapDevice's bitmap.
-BitmapPlatformDevice::BitmapPlatformDevice(
-    CGContextRef context, const SkBitmap& bitmap)
-    : SkBitmapDevice(bitmap),
-      bitmap_context_(context) {
-  SetPlatformDevice(this, this);
-  SkASSERT(bitmap_context_);
-  // Initialize the clip region to the entire bitmap.
-
-  SkIRect rect;
-  rect.set(0, 0,
-           CGBitmapContextGetWidth(bitmap_context_),
-           CGBitmapContextGetHeight(bitmap_context_));
-  CGContextRetain(bitmap_context_);
-  // We must save the state once so that we can use the restore/save trick
-  // in LoadConfig().
-  CGContextSaveGState(bitmap_context_);
-}
-
-BitmapPlatformDevice::~BitmapPlatformDevice() {
-  if (bitmap_context_)
-    CGContextRelease(bitmap_context_);
-}
-
-NativeDrawingContext BitmapPlatformDevice::BeginPlatformPaint(
-    const SkMatrix& transform,
-    const SkIRect& clip_bounds) {
-  LoadConfig(transform, clip_bounds);
-  return bitmap_context_;
-}
-
-SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& cinfo,
-                                                   const SkPaint*) {
-  const SkImageInfo& info = cinfo.fInfo;
-  const bool do_clear = !info.isOpaque();
-  SkASSERT(info.colorType() == kN32_SkColorType);
-  return Create(NULL, info.width(), info.height(), info.isOpaque(), do_clear);
-}
-
-// PlatformCanvas impl
-
-std::unique_ptr<SkCanvas> CreatePlatformCanvasWithPixels(
-    int width,
-    int height,
-    bool is_opaque,
-    uint8_t* data,
-    OnFailureType failureType) {
-  sk_sp<SkBaseDevice> dev(
-      BitmapPlatformDevice::CreateWithData(data, width, height, is_opaque));
-  return CreateCanvas(dev, failureType);
-}
-
-}  // namespace skia