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Unified Diff: skia/ext/bitmap_platform_device_mac.cc

Issue 2011713003: Roll skia to 8cc209111876b7c78b5ec577c9221d8ed5e21024 (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 4 years, 7 months ago
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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 087cf39d7fdfec0bb89681f59f9288ff52f020b3..0000000000000000000000000000000000000000
--- a/skia/ext/bitmap_platform_device_mac.cc
+++ /dev/null
@@ -1,323 +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 <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/SkRegion.h"
-#include "third_party/skia/include/core/SkTypes.h"
-#include "third_party/skia/include/core/SkUtils.h"
-
-namespace skia {
-
-namespace {
-
-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;
-}
-
-void BitmapPlatformDevice::SetMatrixClip(
- const SkMatrix& transform,
- const SkRegion& region) {
- transform_ = transform;
- clip_region_ = region;
- config_dirty_ = true;
-}
-
-// 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 =
- gfx::SkMatrixToCGAffineTransform(transformed_matrix);
-
- // Load final transform into context.
- CGContextConcatCTM(context, cg_matrix);
-}
-
-// Loads a SkRegion into the CG context.
-static void 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, gfx::SkRectToCGRect(rect));
- } else if (region.isRect()) {
- // 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();
- // Do the transformation.
- SkRect rect;
- rect.set(region.getBounds());
- t.mapRect(&rect);
- SkIRect irect;
- rect.round(&irect);
- CGContextClipToRect(context, gfx::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.
- SkASSERT(false);
- // LoadPathToDC(context, path);
- // hrgn = PathToRegion(context);
- }
-}
-
-void BitmapPlatformDevice::LoadConfig() {
- if (!config_dirty_ || !bitmap_context_)
- return; // Nothing to do.
- config_dirty_ = false;
-
- // 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_region_, 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),
- config_dirty_(true), // Want to load the config next time.
- transform_(SkMatrix::I()) {
- 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_));
- clip_region_ = SkRegion(rect);
- 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_);
-}
-
-CGContextRef BitmapPlatformDevice::GetBitmapContext() {
- LoadConfig();
- return bitmap_context_;
-}
-
-void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
- const SkRegion& region,
- const SkClipStack&) {
- SetMatrixClip(transform, region);
-}
-
-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
-
-SkCanvas* CreatePlatformCanvas(CGContextRef ctx, int width, int height,
- bool is_opaque, OnFailureType failureType) {
- const bool do_clear = false;
- skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
- BitmapPlatformDevice::Create(ctx, width, height, is_opaque, do_clear));
- return CreateCanvas(dev, failureType);
-}
-
-SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
- uint8_t* data, OnFailureType failureType) {
- skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
- BitmapPlatformDevice::CreateWithData(data, width, height, is_opaque));
- return CreateCanvas(dev, failureType);
-}
-
-// Port of PlatformBitmap to mac
-
-PlatformBitmap::~PlatformBitmap() {
- if (surface_)
- CGContextRelease(surface_);
-}
-
-bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
- if (RasterDeviceTooBigToAllocate(width, height))
- return false;
-
- if (!bitmap_.tryAllocN32Pixels(width, height, is_opaque))
- return false;
-
- if (!is_opaque)
- bitmap_.eraseColor(0);
-
- surface_ = CGContextForData(bitmap_.getPixels(), bitmap_.width(),
- bitmap_.height());
- return true;
-}
-
-} // namespace skia
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