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// Copyright (c) 2011 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/plugins/ppapi/ppb_image_data_impl.h"
#include <algorithm>
#include <limits>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "skia/ext/platform_canvas.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/c/ppb_image_data.h"
#include "ppapi/c/trusted/ppb_image_data_trusted.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "webkit/plugins/ppapi/common.h"
#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
namespace webkit {
namespace ppapi {
namespace {
PP_ImageDataFormat GetNativeImageDataFormat() {
return PPB_ImageData_Impl::GetNativeImageDataFormat();
}
PP_Bool IsImageDataFormatSupported(PP_ImageDataFormat format) {
return BoolToPPBool(PPB_ImageData_Impl::IsImageDataFormatSupported(format));
}
PP_Resource Create(PP_Instance instance_id,
PP_ImageDataFormat format,
const PP_Size* size,
PP_Bool init_to_zero) {
PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
if (!instance)
return 0;
scoped_refptr<PPB_ImageData_Impl> data(new PPB_ImageData_Impl(instance));
if (!data->Init(format,
size->width,
size->height,
PPBoolToBool(init_to_zero))) {
return 0;
}
return data->GetReference();
}
PP_Bool IsImageData(PP_Resource resource) {
return BoolToPPBool(!!Resource::GetAs<PPB_ImageData_Impl>(resource));
}
PP_Bool Describe(PP_Resource resource, PP_ImageDataDesc* desc) {
// Give predictable values on failure.
memset(desc, 0, sizeof(PP_ImageDataDesc));
scoped_refptr<PPB_ImageData_Impl> image_data(
Resource::GetAs<PPB_ImageData_Impl>(resource));
if (!image_data)
return PP_FALSE;
image_data->Describe(desc);
return PP_TRUE;
}
void* Map(PP_Resource resource) {
scoped_refptr<PPB_ImageData_Impl> image_data(
Resource::GetAs<PPB_ImageData_Impl>(resource));
if (!image_data)
return NULL;
return image_data->Map();
}
void Unmap(PP_Resource resource) {
scoped_refptr<PPB_ImageData_Impl> image_data(
Resource::GetAs<PPB_ImageData_Impl>(resource));
if (image_data)
image_data->Unmap();
}
int32_t GetSharedMemory(PP_Resource resource,
int* handle,
uint32_t* byte_count) {
scoped_refptr<PPB_ImageData_Impl> image_data(
Resource::GetAs<PPB_ImageData_Impl>(resource));
if (image_data) {
*handle = image_data->GetSharedMemoryHandle(byte_count);
return PP_OK;
}
return PP_ERROR_BADRESOURCE;
}
const PPB_ImageData ppb_imagedata = {
&GetNativeImageDataFormat,
&IsImageDataFormatSupported,
&Create,
&IsImageData,
&Describe,
&Map,
&Unmap,
};
const PPB_ImageDataTrusted ppb_imagedata_trusted = {
&GetSharedMemory,
};
} // namespace
PPB_ImageData_Impl::PPB_ImageData_Impl(PluginInstance* instance)
: Resource(instance),
format_(PP_IMAGEDATAFORMAT_BGRA_PREMUL),
width_(0),
height_(0) {
}
PPB_ImageData_Impl::~PPB_ImageData_Impl() {
}
// static
const PPB_ImageData* PPB_ImageData_Impl::GetInterface() {
return &ppb_imagedata;
}
// static
const PPB_ImageDataTrusted* PPB_ImageData_Impl::GetTrustedInterface() {
return &ppb_imagedata_trusted;
}
PPB_ImageData_Impl* PPB_ImageData_Impl::AsPPB_ImageData_Impl() {
return this;
}
bool PPB_ImageData_Impl::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(
instance()->delegate()->CreateImage2D(width, height));
format_ = format;
width_ = width;
height_ = height;
return !!platform_image_.get();
}
void PPB_ImageData_Impl::Describe(PP_ImageDataDesc* desc) const {
desc->format = format_;
desc->size.width = width_;
desc->size.height = height_;
desc->stride = width_ * 4;
}
void* PPB_ImageData_Impl::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 PPB_ImageData_Impl::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.
}
int PPB_ImageData_Impl::GetSharedMemoryHandle(uint32* byte_count) const {
return platform_image_->GetSharedMemoryHandle(byte_count);
}
const SkBitmap* PPB_ImageData_Impl::GetMappedBitmap() const {
if (!mapped_canvas_.get())
return NULL;
return &mapped_canvas_->getTopPlatformDevice().accessBitmap(false);
}
void PPB_ImageData_Impl::Swap(PPB_ImageData_Impl* 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 ppapi
} // namespace webkit
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