/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "GrallocImages.h"
#include <stddef.h>                     // for size_t
#include <stdint.h>                     // for int8_t, uint8_t, uint32_t, etc
#include "nsDebug.h"                    // for NS_WARNING, NS_PRECONDITION
#include "mozilla/layers/ImageBridgeChild.h"
#include "mozilla/layers/GrallocTextureClient.h"
#include "gfx2DGlue.h"

#include <OMX_IVCommon.h>
#include <ColorConverter.h>

using namespace mozilla::ipc;
using namespace android;

#define ALIGN(x, align) ((x + align - 1) & ~(align - 1))

namespace mozilla {
namespace layers {

uint32_t GrallocImage::sColorIdMap[] = {
    HAL_PIXEL_FORMAT_YCbCr_420_P, OMX_COLOR_FormatYUV420Planar,
    HAL_PIXEL_FORMAT_YCbCr_422_P, OMX_COLOR_FormatYUV422Planar,
    HAL_PIXEL_FORMAT_YCbCr_420_SP, OMX_COLOR_FormatYUV420SemiPlanar,
    HAL_PIXEL_FORMAT_YCrCb_420_SP, -1,
    HAL_PIXEL_FORMAT_YCrCb_420_SP_ADRENO, -1,
    HAL_PIXEL_FORMAT_YV12, OMX_COLOR_FormatYUV420Planar,
    0, 0
};

struct GraphicBufferAutoUnlock {
  android::sp<GraphicBuffer> mGraphicBuffer;

  GraphicBufferAutoUnlock(android::sp<GraphicBuffer>& aGraphicBuffer)
    : mGraphicBuffer(aGraphicBuffer) { }

  ~GraphicBufferAutoUnlock() { mGraphicBuffer->unlock(); }
};

GrallocImage::GrallocImage()
  : PlanarYCbCrImage(nullptr),
    mBufferAllocated(false),
    mGraphicBuffer(nullptr),
    mTextureClient(nullptr)
{
  mFormat = GRALLOC_PLANAR_YCBCR;
}

GrallocImage::~GrallocImage()
{
  // If we have a texture client, the latter takes over the responsibility to
  // unlock the GraphicBufferLocked.
  if (mGraphicBuffer.get() && !mTextureClient) {
    mGraphicBuffer->Unlock();
    if (mBufferAllocated) {
      ImageBridgeChild *ibc = ImageBridgeChild::GetSingleton();
      ibc->DeallocSurfaceDescriptorGralloc(mGraphicBuffer->GetSurfaceDescriptor());
      mBufferAllocated = false;
    }
  }
}

void
GrallocImage::SetData(const Data& aData)
{
  NS_PRECONDITION(aData.mYSize.width % 2 == 0, "Image should have even width");
  NS_PRECONDITION(aData.mYSize.height % 2 == 0, "Image should have even height");
  NS_PRECONDITION(aData.mYStride % 16 == 0, "Image should have stride of multiple of 16 pixels");

  mData = aData;
  mSize = aData.mPicSize;

  if (!mGraphicBuffer.get()) {

    SurfaceDescriptor desc;
    ImageBridgeChild *ibc = ImageBridgeChild::GetSingleton();
    ibc->AllocSurfaceDescriptorGralloc(aData.mYSize,
                                       HAL_PIXEL_FORMAT_YV12,
                                       GraphicBuffer::USAGE_SW_READ_OFTEN |
                                       GraphicBuffer::USAGE_SW_WRITE_OFTEN |
                                       GraphicBuffer::USAGE_HW_TEXTURE,
                                       &desc);
    mBufferAllocated = true;
    mGraphicBuffer = new GraphicBufferLocked(desc);
  }

  sp<GraphicBuffer> graphicBuffer =
    GrallocBufferActor::GetFrom(
      mGraphicBuffer->GetSurfaceDescriptor().get_SurfaceDescriptorGralloc());
  if (!graphicBuffer.get()) {
    return;
  }

  if (graphicBuffer->initCheck() != NO_ERROR) {
    return;
  }

  void* vaddr;
  if (graphicBuffer->lock(GraphicBuffer::USAGE_SW_WRITE_OFTEN,
                          &vaddr) != OK) {
    return;
  }

  uint8_t* yChannel = static_cast<uint8_t*>(vaddr);
  gfxIntSize ySize = gfxIntSize(aData.mYSize.width,
                                aData.mYSize.height);
  int32_t yStride = graphicBuffer->getStride();

  uint8_t* vChannel = yChannel + (yStride * ySize.height);
  gfxIntSize uvSize = gfxIntSize(ySize.width / 2,
                                 ySize.height / 2);
  // Align to 16 bytes boundary
  int32_t uvStride = ((yStride / 2) + 15) & ~0x0F;
  uint8_t* uChannel = vChannel + (uvStride * uvSize.height);

  // Memory outside of the image width may not writable. If the stride
  // equals to the image width then we can use only one copy.
  if (yStride == mData.mYStride &&
      yStride == ySize.width) {
    memcpy(yChannel, mData.mYChannel, yStride * ySize.height);
  } else {
    for (int i = 0; i < ySize.height; i++) {
      memcpy(yChannel + i * yStride,
             mData.mYChannel + i * mData.mYStride,
             ySize.width);
    }
  }
  if (uvStride == mData.mCbCrStride &&
      uvStride == uvSize.width) {
    memcpy(uChannel, mData.mCbChannel, uvStride * uvSize.height);
    memcpy(vChannel, mData.mCrChannel, uvStride * uvSize.height);
  } else {
    for (int i = 0; i < uvSize.height; i++) {
      memcpy(uChannel + i * uvStride,
             mData.mCbChannel + i * mData.mCbCrStride,
             uvSize.width);
      memcpy(vChannel + i * uvStride,
             mData.mCrChannel + i * mData.mCbCrStride,
             uvSize.width);
    }
  }
  graphicBuffer->unlock();
}

void GrallocImage::SetData(const GrallocData& aData)
{
  mGraphicBuffer = aData.mGraphicBuffer;
  mSize = aData.mPicSize;
}

/**
 * Converts YVU420 semi planar frames to RGB565, possibly taking different
 * stride values.
 * Needed because the Android ColorConverter class assumes that the Y and UV
 * channels have equal stride.
 */
static void
ConvertYVU420SPToRGB565(void *aYData, uint32_t aYStride,
                        void *aUVData, uint32_t aUVStride,
                        void *aOut,
                        uint32_t aWidth, uint32_t aHeight)
{
  uint8_t *y = (uint8_t*)aYData;
  int8_t *uv = (int8_t*)aUVData;

  uint16_t *rgb = (uint16_t*)aOut;

  for (size_t i = 0; i < aHeight; i++) {
    for (size_t j = 0; j < aWidth; j++) {
      int8_t d = uv[j | 1] - 128;
      int8_t e = uv[j & ~1] - 128;

      // Constants taken from https://en.wikipedia.org/wiki/YUV
      int32_t r = (298 * y[j] + 409 * e + 128) >> 11;
      int32_t g = (298 * y[j] - 100 * d - 208 * e + 128) >> 10;
      int32_t b = (298 * y[j] + 516 * d + 128) >> 11;

      r = r > 0x1f ? 0x1f : r < 0 ? 0 : r;
      g = g > 0x3f ? 0x3f : g < 0 ? 0 : g;
      b = b > 0x1f ? 0x1f : b < 0 ? 0 : b;

      *rgb++ = (uint16_t)(r << 11 | g << 5 | b);
    }

    y += aYStride;
    if (i % 2) {
      uv += aUVStride;
    }
  }
}

already_AddRefed<gfxASurface>
GrallocImage::GetAsSurface()
{
  android::sp<GraphicBuffer> graphicBuffer =
    GrallocBufferActor::GetFrom(GetSurfaceDescriptor());

  void *buffer;
  int32_t rv =
    graphicBuffer->lock(android::GraphicBuffer::USAGE_SW_READ_OFTEN, &buffer);

  if (rv) {
    NS_WARNING("Couldn't lock graphic buffer");
    return nullptr;
  }

  GraphicBufferAutoUnlock unlock(graphicBuffer);

  uint32_t format = graphicBuffer->getPixelFormat();
  uint32_t omxFormat = 0;

  for (int i = 0; sColorIdMap[i]; i += 2) {
    if (sColorIdMap[i] == format) {
      omxFormat = sColorIdMap[i + 1];
      break;
    }
  }

  if (!omxFormat) {
    NS_WARNING("Unknown color format");
    return nullptr;
  }

  nsRefPtr<gfxImageSurface> imageSurface =
    new gfxImageSurface(GetSize(), gfxASurface::ImageFormatRGB16_565);

  uint32_t width = GetSize().width;
  uint32_t height = GetSize().height;

  if (format == HAL_PIXEL_FORMAT_YCrCb_420_SP_ADRENO) {
    // The Adreno hardware decoder aligns image dimensions to a multiple of 32,
    // so we have to account for that here
    uint32_t alignedWidth = ALIGN(width, 32);
    uint32_t alignedHeight = ALIGN(height, 32);
    uint32_t uvOffset = ALIGN(alignedHeight * alignedWidth, 4096);
    uint32_t uvStride = 2 * ALIGN(width / 2, 32);
    uint8_t* buffer_as_bytes = static_cast<uint8_t*>(buffer);
    ConvertYVU420SPToRGB565(buffer, alignedWidth,
                            buffer_as_bytes + uvOffset, uvStride,
                            imageSurface->Data(),
                            width, height);

    return imageSurface.forget();
  }
  else if (format == HAL_PIXEL_FORMAT_YCrCb_420_SP) {
    uint32_t uvOffset = height * width;
    ConvertYVU420SPToRGB565(buffer, width,
                            buffer + uvOffset, width,
                            imageSurface->Data(),
                            width, height);

    return imageSurface.forget();
  }

  android::ColorConverter colorConverter((OMX_COLOR_FORMATTYPE)omxFormat,
                                         OMX_COLOR_Format16bitRGB565);

  if (!colorConverter.isValid()) {
    NS_WARNING("Invalid color conversion");
    return nullptr;
  }

  rv = colorConverter.convert(buffer, width, height,
                              0, 0, width - 1, height - 1 /* source crop */,
                              imageSurface->Data(), width, height,
                              0, 0, width - 1, height - 1 /* dest crop */);

  if (rv) {
    NS_WARNING("OMX color conversion failed");
    return nullptr;
  }

  return imageSurface.forget();
}

TextureClient*
GrallocImage::GetTextureClient()
{
  if (!mTextureClient) {
    const SurfaceDescriptor& sd = GetSurfaceDescriptor();
    if (sd.type() != SurfaceDescriptor::TSurfaceDescriptorGralloc) {
      return nullptr;
    }
    const SurfaceDescriptorGralloc& desc = sd.get_SurfaceDescriptorGralloc();
    TextureFlags flags = desc.external() ? TEXTURE_DEALLOCATE_CLIENT
                                         : TEXTURE_DEALLOCATE_HOST;
    if (desc.isRBSwapped()) {
      flags |= TEXTURE_RB_SWAPPED;
    }
    GrallocBufferActor* actor = static_cast<GrallocBufferActor*>(desc.bufferChild());
    mTextureClient = new GrallocTextureClientOGL(actor,
                                                 gfx::ToIntSize(mSize),
                                                 flags);
    mTextureClient->SetGraphicBufferLocked(mGraphicBuffer);
  }
  return mTextureClient;
}

} // namespace layers
} // namespace mozilla