ppapi/cpp/image_data.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/cpp/image_data.h"
   6
   7 #include <string.h>  // Needed for memset.
   8
   9 #include <algorithm>
  10
  11 #include "ppapi/cpp/instance_handle.h"
  12 #include "ppapi/cpp/module.h"
  13 #include "ppapi/cpp/module_impl.h"
  14
  15 namespace pp {
  16
  17 namespace {
  18
  19 template <> const char* interface_name<PPB_ImageData_1_0>() {
  20   return PPB_IMAGEDATA_INTERFACE_1_0;
  21 }
  22
  23 }  // namespace
  24
  25 ImageData::ImageData() : data_(NULL) {
  26   memset(&desc_, 0, sizeof(PP_ImageDataDesc));
  27 }
  28
  29 ImageData::ImageData(const ImageData& other)
  30     : Resource(other),
  31       desc_(other.desc_),
  32       data_(other.data_) {
  33 }
  34
  35 ImageData::ImageData(PassRef, PP_Resource resource)
  36     : Resource(PASS_REF, resource),
  37       data_(NULL) {
  38   memset(&desc_, 0, sizeof(PP_ImageDataDesc));
  39   InitData();
  40 }
  41
  42 ImageData::ImageData(const InstanceHandle& instance,
  43                      PP_ImageDataFormat format,
  44                      const Size& size,
  45                      bool init_to_zero)
  46     : data_(NULL) {
  47   memset(&desc_, 0, sizeof(PP_ImageDataDesc));
  48
  49   if (!has_interface<PPB_ImageData_1_0>())
  50     return;
  51
  52   PassRefFromConstructor(get_interface<PPB_ImageData_1_0>()->Create(
  53       instance.pp_instance(), format, &size.pp_size(),
  54       PP_FromBool(init_to_zero)));
  55   InitData();
  56 }
  57
  58 ImageData& ImageData::operator=(const ImageData& other) {
  59   Resource::operator=(other);
  60   desc_ = other.desc_;
  61   data_ = other.data_;
  62   return *this;
  63 }
  64
  65 const uint32_t* ImageData::GetAddr32(const Point& coord) const {
  66   // Prefer evil const casts rather than evil code duplication.
  67   return const_cast<ImageData*>(this)->GetAddr32(coord);
  68 }
  69
  70 uint32_t* ImageData::GetAddr32(const Point& coord) {
  71   // If we add more image format types that aren't 32-bit, we'd want to check
  72   // here and fail.
  73   return reinterpret_cast<uint32_t*>(
  74       &static_cast<char*>(data())[coord.y() * stride() + coord.x() * 4]);
  75 }
  76
  77 // static
  78 bool ImageData::IsImageDataFormatSupported(PP_ImageDataFormat format) {
  79   if (!has_interface<PPB_ImageData_1_0>())
  80     return false;
  81   return PP_ToBool(get_interface<PPB_ImageData_1_0>()->
  82       IsImageDataFormatSupported(format));
  83 }
  84
  85 // static
  86 PP_ImageDataFormat ImageData::GetNativeImageDataFormat() {
  87   if (!has_interface<PPB_ImageData_1_0>())
  88     return PP_IMAGEDATAFORMAT_BGRA_PREMUL;  // Default to something on failure.
  89   return get_interface<PPB_ImageData_1_0>()->GetNativeImageDataFormat();
  90 }
  91
  92 void ImageData::InitData() {
  93   if (!has_interface<PPB_ImageData_1_0>())
  94     return;
  95   if (!get_interface<PPB_ImageData_1_0>()->Describe(pp_resource(), &desc_) ||
  96       !(data_ = get_interface<PPB_ImageData_1_0>()->Map(pp_resource())))
  97     *this = ImageData();
  98 }
  99
 100 }  // namespace pp