Proxy the PPP_Printing interface

ppapi/examples/printing/printing.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 "ppapi/cpp/dev/printing_dev.h"
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/rect.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+namespace {
+
+void FillRect(pp::ImageData* image, int left, int top, int width, int height,
+              uint32_t color) {
+  for (int y = std::max(0, top);
+       y < std::min(image->size().height(), top + height);
+       y++) {
+    for (int x = std::max(0, left);
+         x < std::min(image->size().width(), left + width);
+         x++)
+      *image->GetAddr32(pp::Point(x, y)) = color;
+  }
+}
+
+}  // namespace
+
+class MyInstance : public pp::Instance, public pp::Printing_Dev {
+ public:
+  explicit MyInstance(PP_Instance instance)
+      : pp::Instance(instance),
+        pp::Printing_Dev(this) {
+  }
+  virtual ~MyInstance() {}
+
+  virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]) {
+    return true;
+  }
+
+  virtual uint32_t QuerySupportedPrintOutputFormats() {
+    return PP_PRINTOUTPUTFORMAT_RASTER;
+  }
+
+  virtual int32_t PrintBegin(const PP_PrintSettings_Dev& print_settings) {
+    return 1;
+  }
+
+  virtual pp::Resource PrintPages(
+      const PP_PrintPageNumberRange_Dev* page_ranges,
+      uint32_t page_range_count) {
+    pp::Size size(100, 100);
+    pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, true);
+    FillRect(&image, 0, 0, size.width(), size.height(), 0xFFFFFFFF);

[viettrungluu, 2012/02/28 00:11:43]

This will blow up in spectacular fashion if the image data fails to get created,
which could happen.

+
+    FillRect(&image, 0, 0, 10, 10, 0xFF000000);
+    FillRect(&image, size.width() - 11, size.height() - 11, 10, 10, 0xFF000000);
+    return image;
+  }
+
+  virtual void PrintEnd() {
+  }
+
+  virtual bool IsPrintScalingDisabled() {
+    return true;
+  }
+};
+
+class MyModule : public pp::Module {
+ public:
+  MyModule() : pp::Module() {}
+  virtual ~MyModule() {}
+
+  // Override CreateInstance to create your customized Instance object.
+  virtual pp::Instance* CreateInstance(PP_Instance instance) {
+    return new MyInstance(instance);
+  }
+};
+
+namespace pp {
+
+// Factory function for your specialization of the Module object.
+Module* CreateModule() {
+  return new MyModule();
+}
+
+}  // namespace pp
+