// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ppapi/cpp/image_data.h"

#include <string.h>  // Needed for memset.

#include <algorithm>

#include "ppapi/cpp/instance_handle.h"
#include "ppapi/cpp/module.h"
#include "ppapi/cpp/module_impl.h"

namespace pp {

namespace {

template <> const char* interface_name<PPB_ImageData_1_0>() {
  return PPB_IMAGEDATA_INTERFACE_1_0;
}

}  // namespace

ImageData::ImageData() : data_(NULL) {
  memset(&desc_, 0, sizeof(PP_ImageDataDesc));
}

ImageData::ImageData(const ImageData& other)
    : Resource(other),
      desc_(other.desc_),
      data_(other.data_) {
}

ImageData::ImageData(PassRef, PP_Resource resource)
    : Resource(PASS_REF, resource),
      data_(NULL) {
  memset(&desc_, 0, sizeof(PP_ImageDataDesc));
  InitData();
}

ImageData::ImageData(const InstanceHandle& instance,
                     PP_ImageDataFormat format,
                     const Size& size,
                     bool init_to_zero)
    : data_(NULL) {
  memset(&desc_, 0, sizeof(PP_ImageDataDesc));

  if (!has_interface<PPB_ImageData_1_0>())
    return;

  PassRefFromConstructor(get_interface<PPB_ImageData_1_0>()->Create(
      instance.pp_instance(), format, &size.pp_size(),
      PP_FromBool(init_to_zero)));
  InitData();
}

ImageData& ImageData::operator=(const ImageData& other) {
  Resource::operator=(other);
  desc_ = other.desc_;
  data_ = other.data_;
  return *this;
}

const uint32_t* ImageData::GetAddr32(const Point& coord) const {
  // Prefer evil const casts rather than evil code duplication.
  return const_cast<ImageData*>(this)->GetAddr32(coord);
}

uint32_t* ImageData::GetAddr32(const Point& coord) {
  // If we add more image format types that aren't 32-bit, we'd want to check
  // here and fail.
  return reinterpret_cast<uint32_t*>(
      &static_cast<char*>(data())[coord.y() * stride() + coord.x() * 4]);
}

// static
bool ImageData::IsImageDataFormatSupported(PP_ImageDataFormat format) {
  if (!has_interface<PPB_ImageData_1_0>())
    return false;
  return PP_ToBool(get_interface<PPB_ImageData_1_0>()->
      IsImageDataFormatSupported(format));
}

// static
PP_ImageDataFormat ImageData::GetNativeImageDataFormat() {
  if (!has_interface<PPB_ImageData_1_0>())
    return PP_IMAGEDATAFORMAT_BGRA_PREMUL;  // Default to something on failure.
  return get_interface<PPB_ImageData_1_0>()->GetNativeImageDataFormat();
}

void ImageData::InitData() {
  if (!has_interface<PPB_ImageData_1_0>())
    return;
  if (get_interface<PPB_ImageData_1_0>()->Describe(pp_resource(), &desc_)) {
    data_ = get_interface<PPB_ImageData_1_0>()->Map(pp_resource());
    if (data_)
      return;
  }
  *this = ImageData();
}

}  // namespace pp