Update from https://crrev.com/312398

skia/ext/bitmap_platform_device_cairo.cc

+// Copyright 2013 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_cairo.h"
+#include "skia/ext/platform_canvas.h"
+
+#if defined(OS_OPENBSD)
+#include <cairo.h>
+#else
+#include <cairo/cairo.h>
+#endif
+
+namespace skia {
+
+namespace {
+
+void CairoSurfaceReleaseProc(void*, void* context) {
+  SkASSERT(context);
+  cairo_surface_destroy(static_cast<cairo_surface_t*>(context));
+}
+
+// Back the destination bitmap by a Cairo surface.  The bitmap's
+// pixelRef takes ownership of the passed-in surface and will call
+// cairo_surface_destroy() upon destruction.
+//
+// Note: it may immediately destroy the surface, if it fails to create a bitmap
+// with pixels, thus the caller must either ref() the surface before hand, or
+// it must not refer to the surface after this call.
+bool InstallCairoSurfacePixels(SkBitmap* dst,
+                               cairo_surface_t* surface,
+                               bool is_opaque) {
+  SkASSERT(dst);
+  if (!surface) {
+    return false;
+  }
+  SkImageInfo info
+      = SkImageInfo::MakeN32Premul(cairo_image_surface_get_width(surface),
+                                   cairo_image_surface_get_height(surface));
+  return dst->installPixels(info,
+                            cairo_image_surface_get_data(surface),
+                            cairo_image_surface_get_stride(surface),
+                            NULL,
+                            &CairoSurfaceReleaseProc,
+                            static_cast<void*>(surface));
+}
+
+void LoadMatrixToContext(cairo_t* context, const SkMatrix& matrix) {
+  cairo_matrix_t cairo_matrix;
+  cairo_matrix_init(&cairo_matrix,
+                    SkScalarToFloat(matrix.getScaleX()),
+                    SkScalarToFloat(matrix.getSkewY()),
+                    SkScalarToFloat(matrix.getSkewX()),
+                    SkScalarToFloat(matrix.getScaleY()),
+                    SkScalarToFloat(matrix.getTranslateX()),
+                    SkScalarToFloat(matrix.getTranslateY()));
+  cairo_set_matrix(context, &cairo_matrix);
+}
+
+void LoadClipToContext(cairo_t* context, const SkRegion& clip) {
+  cairo_reset_clip(context);
+
+  // TODO(brettw) support non-rect clips.
+  SkIRect bounding = clip.getBounds();
+  cairo_rectangle(context, bounding.fLeft, bounding.fTop,
+                  bounding.fRight - bounding.fLeft,
+                  bounding.fBottom - bounding.fTop);
+  cairo_clip(context);
+}
+
+}  // namespace
+
+void BitmapPlatformDevice::SetMatrixClip(
+    const SkMatrix& transform,
+    const SkRegion& region) {
+  transform_ = transform;
+  clip_region_ = region;
+  config_dirty_ = true;
+}
+
+void BitmapPlatformDevice::LoadConfig() {
+  if (!config_dirty_ || !cairo_)
+    return;  // Nothing to do.
+  config_dirty_ = false;
+
+  // Load the identity matrix since this is what our clip is relative to.
+  cairo_matrix_t cairo_matrix;
+  cairo_matrix_init_identity(&cairo_matrix);
+  cairo_set_matrix(cairo_, &cairo_matrix);
+
+  LoadClipToContext(cairo_, clip_region_);
+  LoadMatrixToContext(cairo_, 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(int width, int height,
+                                                   bool is_opaque,
+                                                   cairo_surface_t* surface) {
+  if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
+    cairo_surface_destroy(surface);
+    return NULL;
+  }
+
+  // must call this before trying to install the surface, since that may result
+  // in the surface being destroyed.
+  cairo_t* cairo = cairo_create(surface);
+
+  SkBitmap bitmap;
+  if (!InstallCairoSurfacePixels(&bitmap, surface, is_opaque)) {
+    cairo_destroy(cairo);
+    return NULL;
+  }
+
+  // The device object will take ownership of the graphics context.
+  return new BitmapPlatformDevice(bitmap, cairo);
+}
+
+BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
+                                                   bool is_opaque) {
+  // This initializes the bitmap to all zeros.
+  cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                                        width, height);
+
+  BitmapPlatformDevice* device = Create(width, height, is_opaque, surface);
+
+#ifndef NDEBUG
+    if (device && is_opaque)  // Fill with bright bluish green
+        SkCanvas(device).drawColor(0xFF00FF80);
+#endif
+
+  return device;
+}
+
+BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
+                                                           int height,
+                                                           bool is_opaque) {
+  // The Linux port always constructs initialized bitmaps, so there is no extra
+  // work to perform here.
+  return Create(width, height, is_opaque);
+}
+
+BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
+                                                   bool is_opaque,
+                                                   uint8_t* data) {
+  cairo_surface_t* surface = cairo_image_surface_create_for_data(
+      data, CAIRO_FORMAT_ARGB32, width, height,
+      cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width));
+
+  return Create(width, height, is_opaque, surface);
+}
+
+// Ownership of the cairo object is transferred.
+BitmapPlatformDevice::BitmapPlatformDevice(
+    const SkBitmap& bitmap,
+    cairo_t* cairo)
+    : SkBitmapDevice(bitmap),
+      cairo_(cairo),
+      config_dirty_(true),
+      transform_(SkMatrix::I()) {  // Want to load the config next time.
+  SetPlatformDevice(this, this);
+}
+
+BitmapPlatformDevice::~BitmapPlatformDevice() {
+  cairo_destroy(cairo_);
+}
+
+SkBaseDevice* BitmapPlatformDevice::onCreateCompatibleDevice(
+                                                     const CreateInfo& info) {
+  SkASSERT(info.fInfo.colorType() == kN32_SkColorType);
+  return BitmapPlatformDevice::Create(info.fInfo.width(), info.fInfo.height(),
+                                      info.fInfo.isOpaque());
+}
+
+cairo_t* BitmapPlatformDevice::BeginPlatformPaint() {
+  LoadConfig();
+  cairo_surface_t* surface = cairo_get_target(cairo_);
+  // Tell cairo to flush anything it has pending.
+  cairo_surface_flush(surface);
+  // Tell Cairo that we (probably) modified (actually, will modify) its pixel
+  // buffer directly.
+  cairo_surface_mark_dirty(surface);
+  return cairo_;
+}
+
+void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
+                                         const SkRegion& region,
+                                         const SkClipStack&) {
+  SetMatrixClip(transform, region);
+}
+
+// PlatformCanvas impl
+
+SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
+                               uint8_t* data, OnFailureType failureType) {
+  skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
+      BitmapPlatformDevice::Create(width, height, is_opaque, data));
+  return CreateCanvas(dev, failureType);
+}
+
+// Port of PlatformBitmap to linux
+PlatformBitmap::~PlatformBitmap() {
+  cairo_destroy(surface_);
+}
+
+bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
+  // The SkBitmap allocates and owns the bitmap memory; PlatformBitmap owns the
+  // cairo drawing context tied to the bitmap. The SkBitmap's pixelRef can
+  // outlive the PlatformBitmap if additional copies are made.
+  int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
+
+  cairo_surface_t* surf = cairo_image_surface_create(
+      CAIRO_FORMAT_ARGB32,
+      width,
+      height);
+  if (cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS) {
+    cairo_surface_destroy(surf);
+    return false;
+  }
+  return InstallCairoSurfacePixels(&bitmap_, surf, is_opaque);
+}
+
+}  // namespace skia