// Copyright 2014 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 "ui/ozone/platform/caca/caca_window_manager.h"

#include "base/debug/trace_event.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkSurface.h"
#include "ui/gfx/skia_util.h"
#include "ui/gfx/vsync_provider.h"
#include "ui/ozone/platform/caca/caca_window.h"
#include "ui/ozone/platform/caca/scoped_caca_types.h"
#include "ui/ozone/public/surface_ozone_canvas.h"

namespace ui {

namespace {

class CacaSurface : public ui::SurfaceOzoneCanvas {
 public:
  CacaSurface(CacaWindow* window);
  virtual ~CacaSurface();

  bool Initialize();

  // ui::SurfaceOzoneCanvas overrides:
  virtual skia::RefPtr<SkCanvas> GetCanvas() override;
  virtual void ResizeCanvas(const gfx::Size& viewport_size) override;
  virtual void PresentCanvas(const gfx::Rect& damage) override;
  virtual scoped_ptr<gfx::VSyncProvider> CreateVSyncProvider() override;

 private:
  CacaWindow* window_;  // Not owned.

  ScopedCacaDither dither_;

  skia::RefPtr<SkSurface> surface_;

  DISALLOW_COPY_AND_ASSIGN(CacaSurface);
};

CacaSurface::CacaSurface(CacaWindow* window) : window_(window) {
}

CacaSurface::~CacaSurface() {
}

bool CacaSurface::Initialize() {
  ResizeCanvas(window_->bitmap_size());
  return true;
}

skia::RefPtr<SkCanvas> CacaSurface::GetCanvas() {
  return skia::SharePtr<SkCanvas>(surface_->getCanvas());
}

void CacaSurface::ResizeCanvas(const gfx::Size& viewport_size) {
  TRACE_EVENT0("ozone", "CacaSurface::ResizeCanvas");

  VLOG(2) << "creating libcaca surface with from window " << (void*)window_;

  SkImageInfo info = SkImageInfo::Make(window_->bitmap_size().width(),
                                       window_->bitmap_size().height(),
                                       kN32_SkColorType,
                                       kPremul_SkAlphaType);

  surface_ = skia::AdoptRef(SkSurface::NewRaster(info));
  if (!surface_)
    LOG(ERROR) << "Failed to create SkSurface";

  dither_.reset(caca_create_dither(info.bytesPerPixel() * 8,
                                   info.width(),
                                   info.height(),
                                   info.minRowBytes(),
                                   0x00ff0000,
                                   0x0000ff00,
                                   0x000000ff,
                                   0xff000000));
  if (!dither_)
    LOG(ERROR) << "failed to create dither";
}

void CacaSurface::PresentCanvas(const gfx::Rect& damage) {
  TRACE_EVENT0("ozone", "CacaSurface::PresentCanvas");

  SkImageInfo info;
  size_t row_bytes;
  const void* pixels = surface_->peekPixels(&info, &row_bytes);

  caca_canvas_t* canvas = caca_get_canvas(window_->display());
  caca_dither_bitmap(canvas,
                     0,
                     0,
                     caca_get_canvas_width(canvas),
                     caca_get_canvas_height(canvas),
                     dither_.get(),
                     static_cast<const uint8_t*>(pixels));
  caca_refresh_display(window_->display());
}

scoped_ptr<gfx::VSyncProvider> CacaSurface::CreateVSyncProvider() {
  return scoped_ptr<gfx::VSyncProvider>();
}

}  // namespace

CacaWindowManager::CacaWindowManager() {
}

int32_t CacaWindowManager::AddWindow(CacaWindow* window) {
  return windows_.Add(window);
}

void CacaWindowManager::RemoveWindow(int window_id, CacaWindow* window) {
  DCHECK_EQ(window, windows_.Lookup(window_id));
  windows_.Remove(window_id);
}

CacaWindowManager::~CacaWindowManager() {
}

bool CacaWindowManager::LoadEGLGLES2Bindings(
    AddGLLibraryCallback add_gl_library,
    SetGLGetProcAddressProcCallback set_gl_get_proc_address) {
  return false;
}

scoped_ptr<ui::SurfaceOzoneCanvas> CacaWindowManager::CreateCanvasForWidget(
    gfx::AcceleratedWidget widget) {
  CacaWindow* window = windows_.Lookup(widget);
  DCHECK(window);

  scoped_ptr<CacaSurface> canvas(new CacaSurface(window));
  bool initialized = canvas->Initialize();
  DCHECK(initialized);
  return canvas.Pass();
}

}  // namespace ui