Creating functions for uploading a mipmapped texture.

src/gpu/GrGpu.cpp

Index: src/gpu/GrGpu.cpp
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 48fc740ae0d9697059c7356ff8f3e1bc6e4ceca6..4d45962d8d6318846fec14105c6f33115684adcb 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2010 Google Inc.
  *
@@ -97,73 +96,115 @@ static GrSurfaceOrigin resolve_origin(GrSurfaceOrigin origin, bool renderTarget)
     }
 }
 
-GrTexture* GrGpu::createTexture(const GrSurfaceDesc& origDesc, bool budgeted,
-                                const void* srcData, size_t rowBytes) {
-    GrSurfaceDesc desc = origDesc;
-
-    if (!this->caps()->isConfigTexturable(desc.fConfig)) {
-        return nullptr;
+/**
+ * Prior to creating a texture, make sure the type of texture being created is
+ * supported by calling check_texture_creation_params.
+ *
+ * @param caps The capabilities of the GL device.
+ * @param desc The descriptor of the texture to create.
+ * @param isRT Indicates if the texture can be a render target.
+ */
+static bool check_texture_creation_params(const GrCaps& caps, const GrSurfaceDesc& desc,
+                                          bool* isRT) {
+    if (!caps.isConfigTexturable(desc.fConfig)) {
+        return false;
     }
 
-    bool isRT = SkToBool(desc.fFlags & kRenderTarget_GrSurfaceFlag);
-    if (isRT && !this->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
-        return nullptr;
+    *isRT = SkToBool(desc.fFlags & kRenderTarget_GrSurfaceFlag);
+    if (*isRT && !caps.isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
+        return false;
     }
 
     // We currently do not support multisampled textures
-    if (!isRT && desc.fSampleCnt > 0) {
-        return nullptr;
+    if (!*isRT && desc.fSampleCnt > 0) {
+        return false;
     }
 
-    GrTexture *tex = nullptr;
-
-    if (isRT) {
-        int maxRTSize = this->caps()->maxRenderTargetSize();
+    if (*isRT) {
+        int maxRTSize = caps.maxRenderTargetSize();
         if (desc.fWidth > maxRTSize || desc.fHeight > maxRTSize) {
-            return nullptr;
+            return false;
         }
     } else {
-        int maxSize = this->caps()->maxTextureSize();
+        int maxSize = caps.maxTextureSize();
         if (desc.fWidth > maxSize || desc.fHeight > maxSize) {
-            return nullptr;
+            return false;
         }
     }
+    return true;
+}
 
-    GrGpuResource::LifeCycle lifeCycle = budgeted ? GrGpuResource::kCached_LifeCycle :
-                                                    GrGpuResource::kUncached_LifeCycle;
+GrTexture* GrGpu::createTexture(const GrSurfaceDesc& origDesc, bool budgeted,
+                                const SkTArray<SkMipMapLevel>& texels) {
+    GrSurfaceDesc desc = origDesc;
 
-    desc.fSampleCnt = SkTMin(desc.fSampleCnt, this->caps()->maxSampleCount());
-    // Attempt to catch un- or wrongly initialized sample counts;
-    SkASSERT(desc.fSampleCnt >= 0 && desc.fSampleCnt <= 64);
+    const GrCaps* caps = this->caps();
+    if (!caps) {
+        return nullptr;
+    } else {
+        bool isRT = false;
+        bool textureCreationParamsValid = check_texture_creation_params(*caps, desc, &isRT);
+        if (!textureCreationParamsValid) {
+            return nullptr;
+        }
 
-    desc.fOrigin = resolve_origin(desc.fOrigin, isRT);
+        desc.fSampleCnt = SkTMin(desc.fSampleCnt, caps->maxSampleCount());
+        // Attempt to catch un- or wrongly intialized sample counts;
+        SkASSERT(desc.fSampleCnt >= 0 && desc.fSampleCnt <= 64);
 
-    if (GrPixelConfigIsCompressed(desc.fConfig)) {
-        // We shouldn't be rendering into this
-        SkASSERT(!isRT);
-        SkASSERT(0 == desc.fSampleCnt);
+        desc.fOrigin = resolve_origin(desc.fOrigin, isRT);
 
-        if (!this->caps()->npotTextureTileSupport() &&
-            (!SkIsPow2(desc.fWidth) || !SkIsPow2(desc.fHeight))) {
-            return nullptr;
-        }
+        GrTexture* tex = nullptr;
+        GrGpuResource::LifeCycle lifeCycle = budgeted ? GrGpuResource::kCached_LifeCycle :
+                                                        GrGpuResource::kUncached_LifeCycle;
 
-        this->handleDirtyContext();
-        tex = this->onCreateCompressedTexture(desc, lifeCycle, srcData);
-    } else {
-        this->handleDirtyContext();
-        tex = this->onCreateTexture(desc, lifeCycle, srcData, rowBytes);
-    }
-    if (!this->caps()->reuseScratchTextures() && !isRT) {
-        tex->resourcePriv().removeScratchKey();
-    }
-    if (tex) {
-        fStats.incTextureCreates();
-        if (srcData) {
-            fStats.incTextureUploads();
+        if (GrPixelConfigIsCompressed(desc.fConfig)) {
+            // We shouldn't be rendering into this
+            SkASSERT(!isRT);
+            SkASSERT(0 == desc.fSampleCnt);
+
+            if (!caps->npotTextureTileSupport() &&
+                (!SkIsPow2(desc.fWidth) || !SkIsPow2(desc.fHeight))) {
+                return nullptr;
+            }
+
+            this->handleDirtyContext();
+            tex = this->onCreateCompressedTexture(desc, lifeCycle, texels);
+        } else {
+            this->handleDirtyContext();
+            tex = this->onCreateTexture(desc, lifeCycle, texels);
         }
+        if (tex) {
+            if (!caps->reuseScratchTextures() && !isRT) {
+                tex->resourcePriv().removeScratchKey();
+            }
+            fStats.incTextureCreates();
+            if (!texels.empty()) {
+                if (texels[0].fTexels) {
+                    fStats.incTextureUploads();
+                }
+            }
+        }
+        return tex;
+    }
+}
+
+GrTexture* GrGpu::createTexture(const GrSurfaceDesc& desc, bool budgeted,
+                                const void* srcData, size_t rowBytes) {
+    const int width = desc.fWidth;
+    const int height = desc.fHeight;
+    if (width <= 0 || height <= 0) {
+        return nullptr;
     }
-    return tex;
+    const uint32_t baseLevelWidth = width;
+    const uint32_t baseLevelHeight = height;
+
+    SkMipMapLevel level(srcData, rowBytes, baseLevelWidth, baseLevelHeight);
+    const int mipLevelCount = 1;
+    SkTArray<SkMipMapLevel> levels(mipLevelCount);
+    levels.push_back(level);
+
+    return this->createTexture(desc, budgeted, levels);
 }
 
 GrTexture* GrGpu::wrapBackendTexture(const GrBackendTextureDesc& desc, GrWrapOwnership ownership) {
@@ -261,7 +302,7 @@ bool GrGpu::getReadPixelsInfo(GrSurface* srcSurface, int width, int height, size
 
     return true;
 }
-bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height, size_t rowBytes,
+bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height,
                                GrPixelConfig srcConfig, DrawPreference* drawPreference,
                                WritePixelTempDrawInfo* tempDrawInfo) {
     SkASSERT(drawPreference);
@@ -279,7 +320,7 @@ bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height, siz
         ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
     }
 
-    if (!this->onGetWritePixelsInfo(dstSurface, width, height, rowBytes, srcConfig, drawPreference,
+    if (!this->onGetWritePixelsInfo(dstSurface, width, height, srcConfig, drawPreference,
                                     tempDrawInfo)) {
         return false;
     }
@@ -324,20 +365,33 @@ bool GrGpu::readPixels(GrSurface* surface,
 
 bool GrGpu::writePixels(GrSurface* surface,
                         int left, int top, int width, int height,
-                        GrPixelConfig config, const void* buffer,
-                        size_t rowBytes) {
-    if (!buffer) {
-        return false;
-    }
-
+                        GrPixelConfig config, const SkTArray<SkMipMapLevel>& texels) {
     this->handleDirtyContext();
-    if (this->onWritePixels(surface, left, top, width, height, config, buffer, rowBytes)) {
+    if (this->onWritePixels(surface, left, top, width, height, config, texels)) {
         fStats.incTextureUploads();
         return true;
     }
     return false;
 }
 
+bool GrGpu::writePixels(GrSurface* surface,
+                        int left, int top, int width, int height,
+                        GrPixelConfig config, const void* buffer,
+                        size_t rowBytes) {
+    if (width <= 0 || height <= 0) {
+        return false;
+    }
+    const uint32_t baseLevelWidth = width;
+    const uint32_t baseLevelHeight = height;
+
+    SkMipMapLevel mipLevel(buffer, rowBytes, baseLevelWidth, baseLevelHeight);
+    const int mipLevelCount = 1;
+    SkTArray<SkMipMapLevel> texels(mipLevelCount);
+    texels.push_back(mipLevel);
+
+    return this->writePixels(surface, left, top, width, height, config, texels);
+}
+
 void GrGpu::resolveRenderTarget(GrRenderTarget* target) {
     SkASSERT(target);
     this->handleDirtyContext();