Add VideoImageGenerator.

media/filters/skcanvas_video_renderer.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 "media/filters/skcanvas_video_renderer.h"
 
 #include "base/logging.h"
 #include "media/base/video_frame.h"
 #include "media/base/yuv_convert.h"
 #include "third_party/libyuv/include/libyuv.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkImageGenerator.h"
 #include "ui/gfx/skbitmap_operations.h"
 
 // Skia internal format depends on a platform. On Android it is ABGR, on others
 // it is ARGB.
 #if SK_B32_SHIFT == 0 && SK_G32_SHIFT == 8 && SK_R32_SHIFT == 16 && \
     SK_A32_SHIFT == 24
 #define LIBYUV_I420_TO_ARGB libyuv::I420ToARGB
 #define LIBYUV_I422_TO_ARGB libyuv::I422ToARGB
 #elif SK_R32_SHIFT == 0 && SK_G32_SHIFT == 8 && SK_B32_SHIFT == 16 && \
     SK_A32_SHIFT == 24
@@ skipping 11 matching lines @@
          format == media::VideoFrame::I420 ||
          format == media::VideoFrame::YV12A ||
          format == media::VideoFrame::YV12J ||
          format == media::VideoFrame::YV24;
 }
 
 static bool IsYUVOrNative(media::VideoFrame::Format format) {
   return IsYUV(format) || format == media::VideoFrame::NATIVE_TEXTURE;
 }
 
-// Converts a VideoFrame containing YUV data to a SkBitmap containing RGB data.
-//
-// |bitmap| will be (re)allocated to match the dimensions of |video_frame|.
-static void ConvertVideoFrameToBitmap(
+// Converts a |video_frame| to raw |rgb_pixels|.
+static void ConvertVideoFrameToRGBPixels(
     const scoped_refptr<media::VideoFrame>& video_frame,
-    SkBitmap* bitmap) {
+    void* rgb_pixels,
+    size_t row_bytes) {
   DCHECK(IsYUVOrNative(video_frame->format()))
       << video_frame->format();
   if (IsYUV(video_frame->format())) {
     DCHECK_EQ(video_frame->stride(media::VideoFrame::kUPlane),
               video_frame->stride(media::VideoFrame::kVPlane));
   }
 
-  // Check if |bitmap| needs to be (re)allocated.
-  if (bitmap->isNull() ||
-      bitmap->width() != video_frame->visible_rect().width() ||
-      bitmap->height() != video_frame->visible_rect().height()) {
-    bitmap->allocN32Pixels(video_frame->visible_rect().width(),
-                           video_frame->visible_rect().height());
-    bitmap->setIsVolatile(true);
-  }
-
-  bitmap->lockPixels();
-
   size_t y_offset = 0;
   size_t uv_offset = 0;
   if (IsYUV(video_frame->format())) {
     int y_shift = (video_frame->format() == media::VideoFrame::YV16) ? 0 : 1;
     // Use the "left" and "top" of the destination rect to locate the offset
     // in Y, U and V planes.
     y_offset = (video_frame->stride(media::VideoFrame::kYPlane) *
                 video_frame->visible_rect().y()) +
                 video_frame->visible_rect().x();
     // For format YV12, there is one U, V value per 2x2 block.
     // For format YV16, there is one U, V value per 2x1 block.
     uv_offset = (video_frame->stride(media::VideoFrame::kUPlane) *
                 (video_frame->visible_rect().y() >> y_shift)) +
                 (video_frame->visible_rect().x() >> 1);
   }
 
   switch (video_frame->format()) {
     case media::VideoFrame::YV12:
     case media::VideoFrame::I420:
       LIBYUV_I420_TO_ARGB(
           video_frame->data(media::VideoFrame::kYPlane) + y_offset,
           video_frame->stride(media::VideoFrame::kYPlane),
           video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
           video_frame->stride(media::VideoFrame::kUPlane),
           video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
           video_frame->stride(media::VideoFrame::kVPlane),
-          static_cast<uint8*>(bitmap->getPixels()),
-          bitmap->rowBytes(),
+          static_cast<uint8*>(rgb_pixels),
+          row_bytes,
           video_frame->visible_rect().width(),
           video_frame->visible_rect().height());
       break;
 
     case media::VideoFrame::YV12J:
       media::ConvertYUVToRGB32(
           video_frame->data(media::VideoFrame::kYPlane) + y_offset,
           video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
           video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
-          static_cast<uint8*>(bitmap->getPixels()),
+          static_cast<uint8*>(rgb_pixels),
           video_frame->visible_rect().width(),
           video_frame->visible_rect().height(),
           video_frame->stride(media::VideoFrame::kYPlane),
           video_frame->stride(media::VideoFrame::kUPlane),
-          bitmap->rowBytes(),
+          row_bytes,
           media::YV12J);
       break;
 
     case media::VideoFrame::YV16:
       LIBYUV_I422_TO_ARGB(
           video_frame->data(media::VideoFrame::kYPlane) + y_offset,
           video_frame->stride(media::VideoFrame::kYPlane),
           video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
           video_frame->stride(media::VideoFrame::kUPlane),
           video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
           video_frame->stride(media::VideoFrame::kVPlane),
-          static_cast<uint8*>(bitmap->getPixels()),
-          bitmap->rowBytes(),
+          static_cast<uint8*>(rgb_pixels),
+          row_bytes,
           video_frame->visible_rect().width(),
           video_frame->visible_rect().height());
       break;
 
     case media::VideoFrame::YV12A:
       // Since libyuv doesn't support YUVA, fallback to media, which is not ARM
       // optimized.
       // TODO(fbarchard, mtomasz): Use libyuv, then copy the alpha channel.
       media::ConvertYUVAToARGB(
           video_frame->data(media::VideoFrame::kYPlane) + y_offset,
           video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
           video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
           video_frame->data(media::VideoFrame::kAPlane),
-          static_cast<uint8*>(bitmap->getPixels()),
+          static_cast<uint8*>(rgb_pixels),
           video_frame->visible_rect().width(),
           video_frame->visible_rect().height(),
           video_frame->stride(media::VideoFrame::kYPlane),
           video_frame->stride(media::VideoFrame::kUPlane),
           video_frame->stride(media::VideoFrame::kAPlane),
-          bitmap->rowBytes(),
+          row_bytes,
           media::YV12);
       break;
 
     case media::VideoFrame::YV24:
       libyuv::I444ToARGB(
           video_frame->data(media::VideoFrame::kYPlane) + y_offset,
           video_frame->stride(media::VideoFrame::kYPlane),
           video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
           video_frame->stride(media::VideoFrame::kUPlane),
           video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
           video_frame->stride(media::VideoFrame::kVPlane),
-          static_cast<uint8*>(bitmap->getPixels()),
-          bitmap->rowBytes(),
+          static_cast<uint8*>(rgb_pixels),
+          row_bytes,
           video_frame->visible_rect().width(),
           video_frame->visible_rect().height());
 #if SK_R32_SHIFT == 0 && SK_G32_SHIFT == 8 && SK_B32_SHIFT == 16 && \
     SK_A32_SHIFT == 24
-      libyuv::ARGBToABGR(
-          static_cast<uint8*>(bitmap->getPixels()),
-          bitmap->rowBytes(),
-          static_cast<uint8*>(bitmap->getPixels()),
-          bitmap->rowBytes(),
-          video_frame->visible_rect().width(),
-          video_frame->visible_rect().height());
+      libyuv::ARGBToABGR(static_cast<uint8*>(rgb_pixels),
+                         row_bytes,
+                         static_cast<uint8*>(rgb_pixels),
+                         row_bytes,
+                         video_frame->visible_rect().width(),
+                         video_frame->visible_rect().height());
 #endif
       break;
 
-    case media::VideoFrame::NATIVE_TEXTURE:
+    case media::VideoFrame::NATIVE_TEXTURE: {
       DCHECK_EQ(video_frame->format(), media::VideoFrame::NATIVE_TEXTURE);
-      video_frame->ReadPixelsFromNativeTexture(*bitmap);
+      SkBitmap tmp;
+      tmp.installPixels(
+          SkImageInfo::MakeN32Premul(video_frame->visible_rect().width(),
+                                     video_frame->visible_rect().height()),
+          rgb_pixels,
+          row_bytes);
+      video_frame->ReadPixelsFromNativeTexture(tmp);
       break;
-
+    }
     default:

[rileya (GONE FROM CHROMIUM), 2014/09/09 00:50:14]

Off-topic: Should this be here?

[scherkus (not reviewing), 2014/09/09 00:55:35]

no -- being explicit would be preferable

       NOTREACHED();
       break;
   }
-  bitmap->notifyPixelsChanged();
-  bitmap->unlockPixels();
 }
 
+// Generates an RGB image from a VideoFrame.
+class VideoImageGenerator : public SkImageGenerator {
+ public:
+  VideoImageGenerator(const scoped_refptr<VideoFrame>& frame) : frame_(frame) {}
+  virtual ~VideoImageGenerator() {}
+
+ protected:
+  virtual bool onGetInfo(SkImageInfo* info) OVERRIDE {
+    info->fWidth = frame_->visible_rect().width();
+    info->fHeight = frame_->visible_rect().height();
+    info->fColorType = kBGRA_8888_SkColorType;
+    info->fAlphaType = kPremul_SkAlphaType;
+    return true;
+  }
+
+  virtual bool onGetPixels(const SkImageInfo& info,
+                           void* pixels,
+                           size_t row_bytes,
+                           SkPMColor c_table[],
+                           int* c_table_count) OVERRIDE {
+    // If skia couldn't do the YUV conversion, we will.
+    ConvertVideoFrameToRGBPixels(frame_, pixels, row_bytes);
+    return true;
+  }
+
+  virtual bool onGetYUV8Planes(SkISize sizes[3],
+                               void* planes[3],
+                               size_t row_bytes[3]) OVERRIDE {
+    // Currently Skia only supports JPEG color range YUV.
+    if (frame_->format() != VideoFrame::YV12J)
+      return false;
+    for (int plane = VideoFrame::kYPlane; plane <= VideoFrame::kVPlane;
+         ++plane) {
+      if (sizes) {
+        gfx::Size size;
+        size = VideoFrame::PlaneSize(
+            frame_->format(), plane, frame_->coded_size());
+        sizes[plane].set(size.width(), size.height());
+      }
+      if (row_bytes)
+        row_bytes[plane] = frame_->row_bytes(plane);
+      if (planes) {
+        memcpy(planes[plane],
+               frame_->data(plane),
+               VideoFrame::PlaneAllocationSize(
+                   frame_->format(), plane, frame_->coded_size()));
+      }
+    }
+    return true;
+  }
+
+ private:
+  scoped_refptr<VideoFrame> frame_;
+};
+
 SkCanvasVideoRenderer::SkCanvasVideoRenderer()
     : last_frame_timestamp_(media::kNoTimestamp()) {
 }
 
 SkCanvasVideoRenderer::~SkCanvasVideoRenderer() {}
 
-void SkCanvasVideoRenderer::Paint(media::VideoFrame* video_frame,
+void SkCanvasVideoRenderer::Paint(const scoped_refptr<VideoFrame>& video_frame,
                                   SkCanvas* canvas,
                                   const gfx::RectF& dest_rect,
                                   uint8 alpha,
                                   SkXfermode::Mode mode,
                                   VideoRotation video_rotation) {
   if (alpha == 0) {
     return;
   }
 
   SkRect dest;
   dest.set(dest_rect.x(), dest_rect.y(), dest_rect.right(), dest_rect.bottom());
 
   SkPaint paint;
   paint.setAlpha(alpha);
 
   // Paint black rectangle if there isn't a frame available or the
   // frame has an unexpected format.
   if (!video_frame || !IsYUVOrNative(video_frame->format())) {
     canvas->drawRect(dest, paint);
     return;
   }
 
   // Check if we should convert and update |last_frame_|.
   if (last_frame_.isNull() ||
       video_frame->timestamp() != last_frame_timestamp_) {
-    ConvertVideoFrameToBitmap(video_frame, &last_frame_);
+    if (!SkInstallDiscardablePixelRef(new VideoImageGenerator(video_frame),
+                                      &last_frame_)) {
+      NOTREACHED();
+    }
 
+    // TODO(rileya): Perform this rotation on the canvas, rather than allocating
+    // a new bitmap and copying.
     switch (video_rotation) {
       case VIDEO_ROTATION_0:
         break;
       case VIDEO_ROTATION_90:
         last_frame_ = SkBitmapOperations::Rotate(
             last_frame_, SkBitmapOperations::ROTATION_90_CW);
         break;
       case VIDEO_ROTATION_180:
         last_frame_ = SkBitmapOperations::Rotate(
             last_frame_, SkBitmapOperations::ROTATION_180_CW);
         break;
       case VIDEO_ROTATION_270:
         last_frame_ = SkBitmapOperations::Rotate(
             last_frame_, SkBitmapOperations::ROTATION_270_CW);
         break;
     }
 
     last_frame_timestamp_ = video_frame->timestamp();
   }
 
   paint.setXfermodeMode(mode);
 
   // Paint using |last_frame_|.
   paint.setFilterLevel(SkPaint::kLow_FilterLevel);
   canvas->drawBitmapRect(last_frame_, NULL, dest, &paint);
 }
 
-void SkCanvasVideoRenderer::Copy(media::VideoFrame* video_frame,
+void SkCanvasVideoRenderer::Copy(const scoped_refptr<VideoFrame>& video_frame,
                                  SkCanvas* canvas) {
   Paint(video_frame,
         canvas,
         video_frame->visible_rect(),
         0xff,
         SkXfermode::kSrc_Mode,
         media::VIDEO_ROTATION_0);
 }
 
 }  // namespace media