SkImage::NewFromYUVTexturesCopy

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImage_Gpu.h"
+#include "GrContext.h"
+#include "GrDrawContext.h"
+#include "effects/GrYUVtoRGBEffect.h"
 #include "SkCanvas.h"
-#include "GrContext.h"
 #include "SkGpuDevice.h"
 
+
 SkImage_Gpu::SkImage_Gpu(int w, int h, SkAlphaType at, GrTexture* tex,
                          int sampleCountForNewSurfaces, SkSurface::Budgeted budgeted)
     : INHERITED(w, h, NULL)
     , fTexture(SkRef(tex))
     , fSampleCountForNewSurfaces(sampleCountForNewSurfaces)
     , fAlphaType(at)
     , fBudgeted(budgeted)
     {}
 
 SkSurface* SkImage_Gpu::onNewSurface(const SkImageInfo& info, const SkSurfaceProps& props) const {
@@ skipping 129 matching lines @@
     }
 
     const SkIRect srcR = SkIRect::MakeWH(dstDesc.fWidth, dstDesc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP, GrContext::kFlushWrites_PixelOp);
 
     const int sampleCount = 0;  // todo: make this an explicit parameter to newSurface()?
     return SkNEW_ARGS(SkImage_Gpu, (dstDesc.fWidth, dstDesc.fHeight, at, dst, sampleCount,
                                     budgeted));
 }
+
+SkImage* SkImage::NewFromYUVTexturesCopy(GrContext* ctx , SkYUVColorSpace colorSpace,
+                                         const GrBackendObject yuvTextureHandles[3],
+                                         const SkISize yuvSizes[3],
+                                         GrSurfaceOrigin origin) {
+    const bool isBudgeted = true;
+    const SkSurface::Budgeted budgeted = SkSurface::kYes_Budgeted;
+
+    if (yuvSizes[0].fWidth <= 0 || yuvSizes[0].fHeight <= 0 ||
+        yuvSizes[1].fWidth <= 0 || yuvSizes[1].fHeight <= 0 ||
+        yuvSizes[2].fWidth <= 0 || yuvSizes[2].fHeight <= 0) {
+        return NULL;
+    }
+    static const GrPixelConfig kConfig = kAlpha_8_GrPixelConfig;
+    GrBackendTextureDesc yDesc;
+    yDesc.fConfig = kConfig;
+    yDesc.fOrigin = origin;
+    yDesc.fSampleCnt = 0;
+    yDesc.fTextureHandle = yuvTextureHandles[0];
+    yDesc.fWidth = yuvSizes[0].fWidth;
+    yDesc.fHeight = yuvSizes[0].fHeight;
+
+    GrBackendTextureDesc uDesc;
+    uDesc.fConfig = kConfig;
+    uDesc.fOrigin = origin;
+    uDesc.fSampleCnt = 0;
+    uDesc.fTextureHandle = yuvTextureHandles[1];
+    uDesc.fWidth = yuvSizes[1].fWidth;
+    uDesc.fHeight = yuvSizes[1].fHeight;
+
+    GrBackendTextureDesc vDesc;
+    vDesc.fConfig = kConfig;
+    vDesc.fOrigin = origin;
+    vDesc.fSampleCnt = 0;
+    vDesc.fTextureHandle = yuvTextureHandles[2];
+    vDesc.fWidth = yuvSizes[2].fWidth;
+    vDesc.fHeight = yuvSizes[2].fHeight;
+
+    SkAutoTUnref<GrTexture> yTex(ctx->textureProvider()->wrapBackendTexture(yDesc));
+    SkAutoTUnref<GrTexture> uTex(ctx->textureProvider()->wrapBackendTexture(uDesc));
+    SkAutoTUnref<GrTexture> vTex(ctx->textureProvider()->wrapBackendTexture(vDesc));
+    if (!yTex || !uTex || !vTex) {
+        return NULL;
+    }
+
+    GrSurfaceDesc dstDesc;
+    // Needs to be a render target in order to draw to it for the yuv->rgb conversion.
+    dstDesc.fFlags = kRenderTarget_GrSurfaceFlag;
+    dstDesc.fOrigin = origin;
+    dstDesc.fWidth = yuvSizes[0].fWidth;
+    dstDesc.fHeight = yuvSizes[0].fHeight;
+    dstDesc.fConfig = kRGBA_8888_GrPixelConfig;
+    dstDesc.fSampleCnt = 0;
+
+    SkAutoTUnref<GrTexture> dst(ctx->textureProvider()->createTexture(

[Daniele Castagna, 2015/05/27 05:28:56]

Should this be refScratchTexture?
We'd be requesting a texture with the same SurfaceDescription more than once,
it'd be nice to avoid reallocating the storage.

[bsalomon, 2015/05/27 16:46:41]

Yes you're right. Will fix. I want createTexture to internally use scratch
textures, but that's a larger fix.

+                                                                  dstDesc, isBudgeted, NULL, 0));
+    if (!dst) {
+        return NULL;
+    }
+
+    GrPaint paint;
+    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.addColorProcessor(GrYUVtoRGBEffect::Create(yTex, uTex, vTex, yuvSizes,
+                                                     colorSpace))->unref();
+
+    const SkRect rect = SkRect::MakeWH(SkIntToScalar(dstDesc.fWidth),
+                                       SkIntToScalar(dstDesc.fHeight));
+    ctx->drawContext()->drawRect(dst->asRenderTarget(), GrClip::WideOpen(), paint, SkMatrix::I(),
+                                 rect);
+    ctx->flushSurfaceWrites(dst);
+    return SkNEW_ARGS(SkImage_Gpu, (dstDesc.fWidth, dstDesc.fHeight, kOpaque_SkAlphaType, dst, 0,
+                                    budgeted));
+}