ozone: Support building without cairo

skia/ext/bitmap_platform_device_linux.cc

-// 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_linux.h"
-#include "skia/ext/bitmap_platform_device_data.h"
-#include "skia/ext/platform_canvas.h"
-
-#if defined(OS_OPENBSD)
-#include <cairo.h>
-#else
-#include <cairo/cairo.h>
-#endif
-
-namespace skia {
-
-namespace {
-
-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
-
-BitmapPlatformDevice::BitmapPlatformDeviceData::BitmapPlatformDeviceData(
-    cairo_surface_t* surface)
-    : surface_(surface),
-      config_dirty_(true),
-      transform_(SkMatrix::I()) {  // Want to load the config next time.
-  bitmap_context_ = cairo_create(surface);
-}
-
-BitmapPlatformDevice::BitmapPlatformDeviceData::~BitmapPlatformDeviceData() {
-  cairo_destroy(bitmap_context_);
-  cairo_surface_destroy(surface_);
-}
-
-void BitmapPlatformDevice::BitmapPlatformDeviceData::SetMatrixClip(
-    const SkMatrix& transform,
-    const SkRegion& region) {
-  transform_ = transform;
-  clip_region_ = region;
-  config_dirty_ = true;
-}
-
-void BitmapPlatformDevice::BitmapPlatformDeviceData::LoadConfig() {
-  if (!config_dirty_ || !bitmap_context_)
-    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(bitmap_context_, &cairo_matrix);
-
-  LoadClipToContext(bitmap_context_, clip_region_);
-  LoadMatrixToContext(bitmap_context_, 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;
-  }
-  SkBitmap bitmap;
-  bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height,
-                   cairo_image_surface_get_stride(surface),
-                   is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
-  bitmap.setPixels(cairo_image_surface_get_data(surface));
-
-  // The device object will take ownership of the graphics context.
-  return new BitmapPlatformDevice
-      (bitmap, new BitmapPlatformDeviceData(surface));
-}
-
-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
-    device->eraseColor(SkColorSetARGB(255, 0, 255, 128));
-#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);
-}
-
-// 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(
-    const SkBitmap& bitmap,
-    BitmapPlatformDeviceData* data)
-    : SkBitmapDevice(bitmap),
-      data_(data) {
-  SetPlatformDevice(this, this);
-}
-
-BitmapPlatformDevice::~BitmapPlatformDevice() {
-}
-
-SkBaseDevice* BitmapPlatformDevice::onCreateCompatibleDevice(
-    SkBitmap::Config config, int width, int height, bool isOpaque,
-    Usage /*usage*/) {
-  SkASSERT(config == SkBitmap::kARGB_8888_Config);
-  return BitmapPlatformDevice::Create(width, height, isOpaque);
-}
-
-cairo_t* BitmapPlatformDevice::BeginPlatformPaint() {
-  data_->LoadConfig();
-  cairo_t* cairo = data_->bitmap_context();
-  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::DrawToNativeContext(
-    PlatformSurface surface, int x, int y, const PlatformRect* src_rect) {
-  // Should never be called on Linux.
-  SkASSERT(false);
-}
-
-void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
-                                         const SkRegion& region,
-                                         const SkClipStack&) {
-  data_->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);
-  bitmap_.setConfig(SkBitmap::kARGB_8888_Config, width, height, stride,
-                    is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
-  if (!bitmap_.allocPixels())  // Using the default allocator.
-    return false;
-
-  cairo_surface_t* surf = cairo_image_surface_create_for_data(
-      reinterpret_cast<unsigned char*>(bitmap_.getPixels()),
-      CAIRO_FORMAT_ARGB32,
-      width,
-      height,
-      stride);
-  if (cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS) {
-    cairo_surface_destroy(surf);
-    return false;
-  }
-
-  surface_ = cairo_create(surf);
-  cairo_surface_destroy(surf);
-  return true;
-}
-
-}  // namespace skia