Creating functions for uploading a mipmapped texture.

src/gpu/GrContext.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrContext.h"
 
@@ skipping 87 matching lines @@
         fDrawTarget->reset();
     }
 }
 
 void GrContext::DrawingMgr::flush() {
     if (fDrawTarget) {
         fDrawTarget->flush();
     }
 }
 
-GrDrawContext* GrContext::DrawingMgr::drawContext(const SkSurfaceProps* surfaceProps) { 
+GrDrawContext* GrContext::DrawingMgr::drawContext(const SkSurfaceProps* surfaceProps) {
     if (this->abandoned()) {
         return nullptr;
     }
 
     const SkSurfaceProps props(SkSurfacePropsCopyOrDefault(surfaceProps));
 
     SkASSERT(props.pixelGeometry() < kNumPixelGeometries);
     if (!fDrawContext[props.pixelGeometry()][props.isUseDeviceIndependentFonts()]) {
         fDrawContext[props.pixelGeometry()][props.isUseDeviceIndependentFonts()] =
                 new GrDrawContext(fContext, fDrawTarget, props);
@@ skipping 194 matching lines @@
     dstPI.fColorType = srcPI.fColorType;
     dstPI.fAlphaType = kPremul_SkAlphaType;
     dstPI.fPixels = outPixels;
     dstPI.fRowBytes = outRowBytes;
 
     return srcPI.convertPixelsTo(&dstPI, width, height);
 }
 
 bool GrContext::writeSurfacePixels(GrSurface* surface,
                                    int left, int top, int width, int height,
-                                   GrPixelConfig srcConfig, const void* buffer, size_t rowBytes,
+                                   GrPixelConfig srcConfig, const SkTArray<SkMipMapLevel>& texels,
                                    uint32_t pixelOpsFlags) {
     RETURN_FALSE_IF_ABANDONED
     ASSERT_OWNED_RESOURCE(surface);
     SkASSERT(surface);
 
+    SkTArray<SkMipMapLevel> texelsCopy(texels);

[bsalomon, 2015/09/15 13:14:11]

Why do we need to copy the mip array?

[cblume, 2015/09/16 18:40:46]

Further down there is a call to GrSurfacePriv::AdjustWritePixelParams inside a
loop over each mipmap level. That call changes the mipmap level texel pointer to
adjust for texture offset (maybe we are writing somewhere to the center of the
texture, not to the top left).

The array being copied is filled with lightweight objects (a pointer to the
texel data for that level and the row bytes for that level). The actual texel
data is not being copied.

+
     this->testPMConversionsIfNecessary(pixelOpsFlags);
 
     // Trim the params here so that if we wind up making a temporary surface it can be as small as
     // necessary and because GrGpu::getWritePixelsInfo requires it.
-    if (!GrSurfacePriv::AdjustWritePixelParams(surface->width(), surface->height(),
-                                               GrBytesPerPixel(srcConfig), &left, &top, &width,
-                                               &height, &buffer, &rowBytes)) {
-        return false;
+    auto currentMipHeight = height;
+    auto currentMipWidth = width;
+    for (auto currentMipLevel = texelsCopy.count() - 1; currentMipLevel >= 0; currentMipLevel--) {
+        auto& currentMipMap = texelsCopy[currentMipLevel];
+        if (!GrSurfacePriv::AdjustWritePixelParams(surface->width(), surface->height(),
+                                                   GrBytesPerPixel(srcConfig), &left, &top,
+                                                   &currentMipWidth, &currentMipHeight,
+                                                   &currentMipMap.fTexels,
+                                                   &currentMipMap.fRowBytes)) {
+            return false;
+        }
+        currentMipHeight /= 2;
+        currentMipWidth /= 2;
     }
 
     bool applyPremulToSrc = false;
     if (kUnpremul_PixelOpsFlag & pixelOpsFlags) {
         if (!GrPixelConfigIs8888(srcConfig)) {
             return false;
         }
         applyPremulToSrc = true;
     }
 
     GrGpu::DrawPreference drawPreference = GrGpu::kNoDraw_DrawPreference;
     // Don't prefer to draw for the conversion (and thereby access a texture from the cache) when
     // we've already determined that there isn't a roundtrip preserving conversion processor pair.
     if (applyPremulToSrc && !this->didFailPMUPMConversionTest()) {
         drawPreference = GrGpu::kCallerPrefersDraw_DrawPreference;
     }
 
     GrGpu::WritePixelTempDrawInfo tempDrawInfo;
-    if (!fGpu->getWritePixelsInfo(surface, width, height, rowBytes, srcConfig, &drawPreference,
+    if (!fGpu->getWritePixelsInfo(surface, width, height, srcConfig, &drawPreference,
                                   &tempDrawInfo)) {
         return false;
     }
 
     if (!(kDontFlush_PixelOpsFlag & pixelOpsFlags) && surface->surfacePriv().hasPendingIO()) {
         this->flush();
     }
 
     SkAutoTUnref<GrTexture> tempTexture;
     if (GrGpu::kNoDraw_DrawPreference != drawPreference) {
@@ skipping 31 matching lines @@
                 if (!fp) {
                     return false;
                 }
             }
             GrRenderTarget* renderTarget = surface->asRenderTarget();
             SkASSERT(renderTarget);
             if (tempTexture->surfacePriv().hasPendingIO()) {
                 this->flush();
             }
             if (applyPremulToSrc) {
-                size_t tmpRowBytes = 4 * width;
-                tmpPixels.reset(width * height);
-                if (!sw_convert_to_premul(srcConfig, width, height, rowBytes, buffer, tmpRowBytes,
-                                          tmpPixels.get())) {
-                    return false;
+                auto currentWidth = width;
+                auto currentHeight = height;
+                for (auto currentMipLevel = texelsCopy.count() - 1; currentMipLevel >= 0; currentMipLevel--) {
+                    size_t tmpRowBytes = 4 * currentWidth;
+                    tmpPixels.reset(currentWidth * currentHeight);
+                    auto& currentMipMap = texelsCopy[currentMipLevel];
+                    if (!sw_convert_to_premul(srcConfig, currentWidth, currentHeight,
+                                              currentMipMap.fRowBytes,
+                                              currentMipMap.fTexels, tmpRowBytes,
+                                              tmpPixels.get())) {
+                        return false;
+                    }
+                    currentMipMap.fRowBytes = tmpRowBytes;
+                    currentMipMap.fTexels = tmpPixels.get();
+                    currentWidth /= 2;
+                    currentHeight /= 2;
                 }
-                rowBytes = tmpRowBytes;
-                buffer = tmpPixels.get();
                 applyPremulToSrc = false;
             }
             if (!fGpu->writePixels(tempTexture, 0, 0, width, height,
-                                   tempDrawInfo.fTempSurfaceDesc.fConfig, buffer,
-                                   rowBytes)) {
+                                   tempDrawInfo.fTempSurfaceDesc.fConfig, texelsCopy)) {
                 return false;
             }
             SkMatrix matrix;
             matrix.setTranslate(SkIntToScalar(left), SkIntToScalar(top));
             SkAutoTUnref<GrDrawContext> drawContext(this->drawContext());
             if (!drawContext) {
                 return false;
             }
             paint.addColorFragmentProcessor(fp);
             SkRect rect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
             drawContext->drawRect(renderTarget, GrClip::WideOpen(), paint, matrix, rect, nullptr);
 
             if (kFlushWrites_PixelOp & pixelOpsFlags) {
                 this->flushSurfaceWrites(surface);
             }
         }
     }
     if (!tempTexture) {
         if (applyPremulToSrc) {
-            size_t tmpRowBytes = 4 * width;
-            tmpPixels.reset(width * height);
-            if (!sw_convert_to_premul(srcConfig, width, height, rowBytes, buffer, tmpRowBytes,
-                                      tmpPixels.get())) {
-                return false;
+            auto currentWidth = width;
+            auto currentHeight = height;
+            for (auto currentMipLevel = texelsCopy.count() - 1; currentMipLevel >= 0; currentMipLevel--) {
+                size_t tmpRowBytes = 4 * currentWidth;
+                tmpPixels.reset(currentWidth * currentHeight);
+                auto& currentMipMap = texelsCopy[currentMipLevel];
+                if (!sw_convert_to_premul(srcConfig, currentWidth, currentHeight,
+                                          currentMipMap.fRowBytes, currentMipMap.fTexels,
+                                          tmpRowBytes, tmpPixels.get())) {
+                    return false;
+                }
+                currentMipMap.fRowBytes = tmpRowBytes;
+                currentMipMap.fTexels = tmpPixels.get();
+                currentWidth /= 2;
+                currentHeight /= 2;
             }
-            rowBytes = tmpRowBytes;
-            buffer = tmpPixels.get();
             applyPremulToSrc = false;
         }
-        return fGpu->writePixels(surface, left, top, width, height, srcConfig, buffer, rowBytes);
+        return fGpu->writePixels(surface, left, top, width, height, srcConfig, texelsCopy);
     }
     return true;
 }
 
+bool GrContext::writeSurfacePixels(GrSurface* surface,
+                                   int left, int top, int width, int height,
+                                   GrPixelConfig srcConfig, const void* buffer, size_t rowBytes,
+                                   uint32_t pixelOpsFlags) {
+    SkMipMapLevel level(buffer, rowBytes);
+    const int mipLevelCount = 1;
+    SkTArray<SkMipMapLevel> texels(mipLevelCount);
+    texels.push_back(level);
+
+    return this->writeSurfacePixels(surface, left, top, width, height, srcConfig, texels,
+                                    pixelOpsFlags);
+}
+
 bool GrContext::readSurfacePixels(GrSurface* src,
                                   int left, int top, int width, int height,
                                   GrPixelConfig dstConfig, void* buffer, size_t rowBytes,
                                   uint32_t flags) {
     RETURN_FALSE_IF_ABANDONED
     ASSERT_OWNED_RESOURCE(src);
     SkASSERT(src);
 
     this->testPMConversionsIfNecessary(flags);
     SkAutoMutexAcquire ama(fReadPixelsMutex);
@@ skipping 288 matching lines @@
     }
     if (maxTextureBytes) {
         *maxTextureBytes = fResourceCache->getMaxResourceBytes();
     }
 }
 
 void GrContext::setResourceCacheLimits(int maxTextures, size_t maxTextureBytes) {
     fResourceCache->setLimits(maxTextures, maxTextureBytes);
 }