new image from backend desc

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 "SkCanvas.h"
 #include "GrContext.h"
+#include "SkGpuDevice.h"
 
-SkImage_Gpu::SkImage_Gpu(const SkBitmap& bitmap, int sampleCountForNewSurfaces,
+SkImage_Gpu::SkImage_Gpu(int w, int h, GrTexture* tex, int sampleCountForNewSurfaces,
                          SkSurface::Budgeted budgeted)
-    : INHERITED(bitmap.width(), bitmap.height(), NULL)
-    , fBitmap(bitmap)
+    : INHERITED(w, h, NULL)
+    , fTexture(SkRef(tex))
     , fSampleCountForNewSurfaces(sampleCountForNewSurfaces)
     , fBudgeted(budgeted)
-{
-    SkASSERT(fBitmap.getTexture());
-}
-
-SkShader* SkImage_Gpu::onNewShader(SkShader::TileMode tileX,
-                                   SkShader::TileMode tileY,
-                                   const SkMatrix* localMatrix) const
-{
-    return SkShader::CreateBitmapShader(fBitmap, tileX, tileY, localMatrix);
-}
+    {}
 
 SkSurface* SkImage_Gpu::onNewSurface(const SkImageInfo& info, const SkSurfaceProps& props) const {
-    GrContext* ctx = this->getTexture()->getContext();
+    GrTexture* tex = this->getTexture();
+    SkASSERT(tex);
+    GrContext* ctx = tex->getContext();

[bsalomon, 2015/05/07 17:05:56]

This actually can fail if the GrContext was told to abandon (e.g. the GL context
went away).

[reed1, 2015/05/07 17:49:11]

Done.

+    SkASSERT(ctx);
     // TODO: Change signature of onNewSurface to take a budgeted param.
     static const SkSurface::Budgeted kBudgeted = SkSurface::kNo_Budgeted;
     return SkSurface::NewRenderTarget(ctx, kBudgeted, info, fSampleCountForNewSurfaces, &props);
 }
 
-GrTexture* SkImage_Gpu::onGetTexture() const {
-    return fBitmap.getTexture();
+extern void SkTextureImageApplyBudgetedDecision(SkImage* image) {
+    if (image->getTexture()) {
+        ((SkImage_Gpu*)image)->applyBudgetDecision();
+    }
+}
+
+SkShader* SkImage_Gpu::onNewShader(SkShader::TileMode tileX,

[robertphillips, 2015/05/07 16:50:04]

line these guys up?

[reed1, 2015/05/07 17:49:11]

Done.

+                                          SkShader::TileMode tileY,
+                                          const SkMatrix* localMatrix) const
+{
+    SkBitmap bm;
+    GrWrapTextureInBitmap(fTexture, this->width(), this->height(), this->isOpaque(), &bm);
+    return SkShader::CreateBitmapShader(bm, tileX, tileY, localMatrix);
 }
 
 bool SkImage_Gpu::getROPixels(SkBitmap* dst) const {
-    return fBitmap.copyTo(dst, kN32_SkColorType);
+    SkAlphaType at = this->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
+    if (!dst->tryAllocPixels(SkImageInfo::MakeN32(this->width(), this->height(), at))) {
+        return false;
+    }
+    if (!fTexture->readPixels(0, 0, dst->width(), dst->height(), kSkia8888_GrPixelConfig,
+                              dst->getPixels(), dst->rowBytes())) {
+        return false;
+    }
+    return true;
 }
 
 bool SkImage_Gpu::isOpaque() const {
-    return fBitmap.isOpaque();
+    return GrPixelConfigIsOpaque(fTexture->config());
 }
 
-///////////////////////////////////////////////////////////////////////////////
-
-SkImage* SkNewImageFromBitmapTexture(const SkBitmap& bitmap, int sampleCountForNewSurfaces,
-                                     SkSurface::Budgeted budgeted) {
-    if (0 == bitmap.width() || 0 == bitmap.height() || NULL == bitmap.getTexture()) {
+SkImage* SkImage::NewFromTexture(GrContext* ctx, const GrBackendTextureDesc& desc) {
+    if (desc.fWidth <= 0 || desc.fHeight <= 0) {
         return NULL;
     }
-    return SkNEW_ARGS(SkImage_Gpu, (bitmap, sampleCountForNewSurfaces, budgeted));
+    SkAutoTUnref<GrTexture> tex(ctx->textureProvider()->wrapBackendTexture(desc));
+    if (!tex) {
+        return NULL;
+    }
+    return SkNEW_ARGS(SkImage_Gpu, (desc.fWidth, desc.fHeight, tex, 0, SkSurface::kNo_Budgeted));
 }
 
-GrTexture* SkTextureImageGetTexture(SkImage* image) {
-    return ((SkImage_Gpu*)image)->getTexture();
+SkImage* SkImage::NewFromTextureCopy(GrContext* ctx, const GrBackendTextureDesc& srcDesc) {
+    if (srcDesc.fWidth <= 0 || srcDesc.fHeight <= 0) {
+        return NULL;
+    }
+    SkAutoTUnref<GrTexture> src(ctx->textureProvider()->wrapBackendTexture(srcDesc));
+    if (!src) {
+        return NULL;
+    }
+
+    GrSurfaceDesc dstDesc;
+    dstDesc.fFlags = kNone_GrSurfaceFlags;
+    dstDesc.fOrigin = srcDesc.fOrigin;
+    dstDesc.fWidth = srcDesc.fWidth;
+    dstDesc.fHeight = srcDesc.fHeight;
+    dstDesc.fConfig = srcDesc.fConfig;
+    dstDesc.fSampleCnt = srcDesc.fSampleCnt;
+

[robertphillips, 2015/05/07 16:50:04]

So, where is the copy happening?

[reed1, 2015/05/07 17:49:12]

Done.

+    SkAutoTUnref<GrTexture> dst(ctx->textureProvider()->createTexture(dstDesc, true, NULL, 0));
+    if (!dst) {
+        return NULL;
+    }

[bsalomon, 2015/05/07 17:05:56]

Yeah, I think you need a GrContext::copySurface call here with
kFlushWrites_PixelOp to ensure the copy is issued to GL before returning.

[reed1, 2015/05/07 17:49:12]

Done.

+    return SkNEW_ARGS(SkImage_Gpu,
+                      (dstDesc.fWidth, dstDesc.fHeight, dst, 0, SkSurface::kYes_Budgeted));
 }
-
-extern void SkTextureImageApplyBudgetedDecision(SkImage* image) {
-    ((SkImage_Gpu*)image)->applyBudgetDecision();
-}