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// Copyright (c) 2010 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 "webkit/glue/plugins/pepper_image_data.h"
#include <algorithm>
#include <limits>
#include "base/logging.h"
#include "base/scoped_ptr.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/ppapi/c/pp_instance.h"
#include "third_party/ppapi/c/pp_module.h"
#include "third_party/ppapi/c/pp_resource.h"
#include "third_party/ppapi/c/ppb_image_data.h"
#include "third_party/ppapi/c/trusted/ppb_image_data_trusted.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "webkit/glue/plugins/pepper_plugin_instance.h"
#include "webkit/glue/plugins/pepper_plugin_module.h"
namespace pepper {
namespace {
PP_ImageDataFormat GetNativeImageDataFormat() {
return ImageData::GetNativeImageDataFormat();
}
bool IsImageDataFormatSupported(PP_ImageDataFormat format) {
return ImageData::IsImageDataFormatSupported(format);
}
PP_Resource Create(PP_Module module_id,
PP_ImageDataFormat format,
const PP_Size* size,
bool init_to_zero) {
PluginModule* module = ResourceTracker::Get()->GetModule(module_id);
if (!module)
return 0;
scoped_refptr<ImageData> data(new ImageData(module));
if (!data->Init(format, size->width, size->height, init_to_zero))
return 0;
return data->GetReference();
}
bool IsImageData(PP_Resource resource) {
return !!Resource::GetAs<ImageData>(resource);
}
bool Describe(PP_Resource resource, PP_ImageDataDesc* desc) {
// Give predictable values on failure.
memset(desc, 0, sizeof(PP_ImageDataDesc));
scoped_refptr<ImageData> image_data(Resource::GetAs<ImageData>(resource));
if (!image_data)
return false;
image_data->Describe(desc);
return true;
}
void* Map(PP_Resource resource) {
scoped_refptr<ImageData> image_data(Resource::GetAs<ImageData>(resource));
if (!image_data)
return NULL;
return image_data->Map();
}
void Unmap(PP_Resource resource) {
scoped_refptr<ImageData> image_data(Resource::GetAs<ImageData>(resource));
if (image_data)
image_data->Unmap();
}
uint64_t GetNativeMemoryHandle2(PP_Resource resource) {
scoped_refptr<ImageData> image_data(Resource::GetAs<ImageData>(resource));
if (image_data)
return image_data->GetNativeMemoryHandle();
return 0;
}
const PPB_ImageData ppb_imagedata = {
&GetNativeImageDataFormat,
&IsImageDataFormatSupported,
&Create,
&IsImageData,
&Describe,
&Map,
&Unmap,
};
const PPB_ImageDataTrusted ppb_imagedata_trusted = {
&GetNativeMemoryHandle2,
};
} // namespace
ImageData::ImageData(PluginModule* module)
: Resource(module),
format_(PP_IMAGEDATAFORMAT_BGRA_PREMUL),
width_(0),
height_(0) {
}
ImageData::~ImageData() {
}
// static
const PPB_ImageData* ImageData::GetInterface() {
return &ppb_imagedata;
}
// static
const PPB_ImageDataTrusted* ImageData::GetTrustedInterface() {
return &ppb_imagedata_trusted;
}
// static
PP_ImageDataFormat ImageData::GetNativeImageDataFormat() {
if (SK_B32_SHIFT == 0)
return PP_IMAGEDATAFORMAT_BGRA_PREMUL;
else if (SK_R32_SHIFT == 0)
return PP_IMAGEDATAFORMAT_RGBA_PREMUL;
else
return PP_IMAGEDATAFORMAT_BGRA_PREMUL; // Default to something on failure.
}
// static
bool ImageData::IsImageDataFormatSupported(PP_ImageDataFormat format) {
return format == PP_IMAGEDATAFORMAT_BGRA_PREMUL ||
format == PP_IMAGEDATAFORMAT_RGBA_PREMUL;
}
bool ImageData::Init(PP_ImageDataFormat format,
int width, int height,
bool init_to_zero) {
// TODO(brettw) this should be called only on the main thread!
// TODO(brettw) use init_to_zero when we implement caching.
if (!IsImageDataFormatSupported(format))
return false; // Only support this one format for now.
if (width <= 0 || height <= 0)
return false;
if (static_cast<int64>(width) * static_cast<int64>(height) >=
std::numeric_limits<int32>::max())
return false; // Prevent overflow of signed 32-bit ints.
platform_image_.reset(
module()->GetSomeInstance()->delegate()->CreateImage2D(width, height));
format_ = format;
width_ = width;
height_ = height;
return !!platform_image_.get();
}
void ImageData::Describe(PP_ImageDataDesc* desc) const {
desc->format = format_;
desc->size.width = width_;
desc->size.height = height_;
desc->stride = width_ * 4;
}
void* ImageData::Map() {
if (!mapped_canvas_.get()) {
mapped_canvas_.reset(platform_image_->Map());
if (!mapped_canvas_.get())
return NULL;
}
const SkBitmap& bitmap =
mapped_canvas_->getTopPlatformDevice().accessBitmap(true);
// Our platform bitmaps are set to opaque by default, which we don't want.
const_cast<SkBitmap&>(bitmap).setIsOpaque(false);
bitmap.lockPixels();
return bitmap.getAddr32(0, 0);
}
void ImageData::Unmap() {
// This is currently unimplemented, which is OK. The data will just always
// be around once it's mapped. Chrome's TransportDIB isn't currently
// unmappable without freeing it, but this may be something we want to support
// in the future to save some memory.
}
uint64 ImageData::GetNativeMemoryHandle() const {
return platform_image_->GetSharedMemoryHandle();
}
const SkBitmap* ImageData::GetMappedBitmap() const {
if (!mapped_canvas_.get())
return NULL;
return &mapped_canvas_->getTopPlatformDevice().accessBitmap(false);
}
void ImageData::Swap(ImageData* other) {
swap(other->platform_image_, platform_image_);
swap(other->mapped_canvas_, mapped_canvas_);
std::swap(other->format_, format_);
std::swap(other->width_, width_);
std::swap(other->height_, height_);
}
} // namespace pepper
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