Creating functions for uploading a mipmapped texture.

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index feeac933ddd1faf932ef72a0882e43bf6599d852..59285b6ec364769c1242596d66feb494b2e3c5d7 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -22,6 +22,7 @@
 #include "glsl/GrGLSLCaps.h"
 #include "SkStrokeRec.h"
 #include "SkTemplates.h"
+#include "SkTypes.h"
 
 #define GL_CALL(X) GR_GL_CALL(this->glInterface(), X)
 #define GL_CALL_RET(RET, X) GR_GL_CALL_RET(this->glInterface(), RET, X)
@@ -437,7 +438,7 @@ GrTexture* GrGLGpu::onWrapBackendTexture(const GrBackendTextureDesc& desc,
         case kBorrow_GrWrapOwnership:
             idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
             break;
-    }    
+    }
 
     // next line relies on GrBackendTextureDesc's flags matching GrTexture's
     surfDesc.fFlags = (GrSurfaceFlags) desc.fFlags;
@@ -487,7 +488,7 @@ GrRenderTarget* GrGLGpu::onWrapBackendRenderTarget(const GrBackendRenderTargetDe
         case kBorrow_GrWrapOwnership:
             idDesc.fLifeCycle = GrGpuResource::kBorrowed_LifeCycle;
             break;
-    }    
+    }
     idDesc.fSampleConfig = GrRenderTarget::kUnified_SampleConfig;
 
     GrSurfaceDesc desc;
@@ -503,7 +504,7 @@ GrRenderTarget* GrGLGpu::onWrapBackendRenderTarget(const GrBackendRenderTargetDe
 
 ////////////////////////////////////////////////////////////////////////////////
 bool GrGLGpu::onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height,
-                                   size_t rowBytes, GrPixelConfig srcConfig,
+                                   GrPixelConfig srcConfig,
                                    DrawPreference* drawPreference,
                                    WritePixelTempDrawInfo* tempDrawInfo) {
     if (kIndex_8_GrPixelConfig == srcConfig || GrPixelConfigIsCompressed(dstSurface->config())) {
@@ -563,8 +564,8 @@ bool GrGLGpu::onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height,
 
 bool GrGLGpu::onWritePixels(GrSurface* surface,
                             int left, int top, int width, int height,
-                            GrPixelConfig config, const void* buffer,
-                            size_t rowBytes) {
+                            GrPixelConfig config,
+                            const SkTArray<SkMipMapLevel>& texels) {
     GrGLTexture* glTex = static_cast<GrGLTexture*>(surface->asTexture());
     if (!glTex) {
         return false;
@@ -582,19 +583,14 @@ bool GrGLGpu::onWritePixels(GrSurface* surface,
     if (GrPixelConfigIsCompressed(glTex->desc().fConfig)) {
         // We check that config == desc.fConfig in GrGLGpu::canWriteTexturePixels()
         SkASSERT(config == glTex->desc().fConfig);
-        success = this->uploadCompressedTexData(glTex->desc(), glTex->target(), buffer, false, left,
-                                                top, width, height);
+        success = this->uploadCompressedTexData(glTex->desc(), glTex->target(), texels, false,
+                                                left, top, width, height);
     } else {
         success = this->uploadTexData(glTex->desc(), glTex->target(), false, left, top, width,
-                                      height, config, buffer, rowBytes);
+                                      height, config, texels);
     }
 
-    if (success) {
-        glTex->texturePriv().dirtyMipMaps(true);
-        return true;
-    }
-
-    return false;
+    return success;
 }
 
 static inline GrGLenum check_alloc_error(const GrSurfaceDesc& desc,
@@ -606,42 +602,17 @@ static inline GrGLenum check_alloc_error(const GrSurfaceDesc& desc,
     }
 }
 
-bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
-                            GrGLenum target,
-                            bool isNewTexture,
-                            int left, int top, int width, int height,
-                            GrPixelConfig dataConfig,
-                            const void* data,
-                            size_t rowBytes) {
-    SkASSERT(data || isNewTexture);
-
-    // If we're uploading compressed data then we should be using uploadCompressedTexData
-    SkASSERT(!GrPixelConfigIsCompressed(dataConfig));
-
-    size_t bpp = GrBytesPerPixel(dataConfig);
-    if (!GrSurfacePriv::AdjustWritePixelParams(desc.fWidth, desc.fHeight, bpp, &left, &top,
-                                               &width, &height, &data, &rowBytes)) {
-        return false;
-    }
-    size_t trimRowBytes = width * bpp;
-
-    // in case we need a temporary, trimmed copy of the src pixels
-#if defined(GOOGLE3)
-    // Stack frame size is limited in GOOGLE3.
-    SkAutoSMalloc<64 * 128> tempStorage;
-#else
-    SkAutoSMalloc<128 * 128> tempStorage;
-#endif
-
-    // We currently lazily create MIPMAPs when the we see a draw with
-    // GrTextureParams::kMipMap_FilterMode. Using texture storage requires that the
-    // MIP levels are all created when the texture is created. So for now we don't use
-    // texture storage.
-    bool useTexStorage = false &&
-                         isNewTexture &&
-                         this->glCaps().texStorageSupport();
-
-    if (useTexStorage && kGL_GrGLStandard == this->glStandard()) {
+/**
+ * Determines if TexStorage can be used when creating a texture.
+ *
+ * @param caps     The capabilities of the GL device.
+ * @param standard The GL standard in use.
+ * @param desc     The surface descriptor for the texture being created.
+ */
+static bool can_use_tex_storage(const GrGLCaps& caps, const GrGLStandard& standard,
+                                const GrSurfaceDesc& desc) {
+    bool useTexStorage = caps.texStorageSupport();
+    if (useTexStorage && kGL_GrGLStandard == standard) {
         // 565 is not a sized internal format on desktop GL. So on desktop with
         // 565 we always use an unsized internal format to let the system pick
         // the best sized format to convert the 565 data to. Since TexStorage
@@ -649,59 +620,97 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
         useTexStorage = desc.fConfig != kRGB_565_GrPixelConfig;
     }
 
-    GrGLenum internalFormat = 0x0; // suppress warning
-    GrGLenum externalFormat = 0x0; // suppress warning
-    GrGLenum externalType = 0x0;   // suppress warning
+    return useTexStorage;
+}
 
+/**
+ * Determines if sized internal formats are available for the texture being created.
+ *
+ * @param useTexStorage The result of a call to can_use_tex_storage().
+ * @param caps          The capabilities of the GL device.
+ * @param standard      The GL standard in use.
+ * @param version       The GL version in use.
+ * @param dataConfig    The pixel configuration for the texture being created.
+ */
+static bool can_use_sized_format(bool useTexStorage, const GrGLCaps& caps,
+                                 const GrGLStandard& standard, const GrGLVersion& version,
+                                 GrPixelConfig dataConfig) {
     // glTexStorage requires sized internal formats on both desktop and ES. ES2 requires an unsized
     // format for glTexImage, unlike ES3 and desktop.
     bool useSizedFormat = useTexStorage;
-    if (kGL_GrGLStandard == this->glStandard() ||
-        (this->glVersion() >= GR_GL_VER(3, 0) &&
+    if (kGL_GrGLStandard == standard ||
+        (version >= GR_GL_VER(3, 0) &&
          // ES3 only works with sized BGRA8 format if "GL_APPLE_texture_format_BGRA8888" enabled
-         (kBGRA_8888_GrPixelConfig != dataConfig || !this->glCaps().bgraIsInternalFormat())))  {
+         (kBGRA_8888_GrPixelConfig != dataConfig || !caps.bgraIsInternalFormat()))) {
         useSizedFormat = true;
     }
 
-    if (!this->configToGLFormats(dataConfig, useSizedFormat, &internalFormat,
-                                 &externalFormat, &externalType)) {
-        return false;
-    }
+    return useSizedFormat;
+}
 
-    /*
-     *  check whether to allocate a temporary buffer for flipping y or
-     *  because our srcData has extra bytes past each row. If so, we need
-     *  to trim those off here, since GL ES may not let us specify
-     *  GL_UNPACK_ROW_LENGTH.
-     */
-    bool restoreGLRowLength = false;
-    bool swFlipY = false;
-    bool glFlipY = false;
-    if (data) {
-        if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
-            if (this->glCaps().unpackFlipYSupport()) {
-                glFlipY = true;
-            } else {
-                swFlipY = true;
-            }
+/**
+ * Prior to a texture being created, the image may need to be flipped vertically. This function
+ * prepares the texels for texture creation.
+ *
+ * @param desc               The surface descriptor for the texture being created.
+ * @param caps               The capabilities of the GL device.
+ * @param interface          The GL interface in use.
+ * @param swFlipY            Should software be used when flipping a texture vertically?
+ * @param glFlipY            Should GL be used when flipping a texture vertically?
+ * @param width              The width of the texture in texels.
+ * @param height             The height of the texture in texels.
+ * @param bpp                The bits per pixel (or texel, really) of the texture.
+ * @param texels             An array of mipmap levels which contain the texel data at that level.
+ * @param tempStorage        In the case where the image needs to be flipped vertically, it will
+ *                           use tempStorage as a buffer.
+ * @param restoreGLRowLength After the texture is created, will the GL row length unpacking need
+ *                           to be restored?
+ */
+static void prepare_image_for_writing_to_texture(const GrSurfaceDesc& desc, const GrGLCaps& caps,
+                                                 const GrGLInterface& interface, bool swFlipY,
+                                                 bool glFlipY, int bpp,
+                                                 SkTArray<SkMipMapLevel>& texels,
+#if defined(GOOGLE3)
+                                                 // Stack frame size is limited in GOOGLE3.
+                                                 SkAutoSMalloc<64 * 128>& tempStorage,
+#else
+                                                 SkAutoSMalloc<128 * 128>& tempStorage,
+#endif
+                                                 bool* restoreGLRowLength) {
+    for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+        if (texels[currentMipLevel].fTexels == nullptr) {
+            continue;
         }
-        if (this->glCaps().unpackRowLengthSupport() && !swFlipY) {
+
+        const size_t trimRowBytes = texels[currentMipLevel].fWidth * bpp;
+
+        /*
+         *  check whether to allocate a temporary buffer for flipping y or
+         *  because our srcData has extra bytes past each row. If so, we need
+         *  to trim those off here, since GL ES may not let us specify
+         *  GL_UNPACK_ROW_LENGTH.
+         */
+        *restoreGLRowLength = false;
+
+        const size_t rowBytes = texels[currentMipLevel].fRowBytes;
+        if (caps.unpackRowLengthSupport() && !swFlipY) {
             // can't use this for flipping, only non-neg values allowed. :(
             if (rowBytes != trimRowBytes) {
                 GrGLint rowLength = static_cast<GrGLint>(rowBytes / bpp);
-                GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, rowLength));
-                restoreGLRowLength = true;
+                GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_ROW_LENGTH, rowLength));
+                *restoreGLRowLength = true;
             }
         } else {
             if (trimRowBytes != rowBytes || swFlipY) {
+                const uint32_t height = texels[currentMipLevel].fHeight;
                 // copy data into our new storage, skipping the trailing bytes
-                size_t trimSize = height * trimRowBytes;
-                const char* src = (const char*)data;
-                if (swFlipY) {
+                const size_t trimSize = height * trimRowBytes;
+                const char* src = (const char*)texels[currentMipLevel].fTexels;
+                if (swFlipY && height >= 1) {
                     src += (height - 1) * rowBytes;
                 }
                 char* dst = (char*)tempStorage.reset(trimSize);
-                for (int y = 0; y < height; y++) {
+                for (uint32_t y = 0; y < height; y++) {
                     memcpy(dst, src, trimRowBytes);
                     if (swFlipY) {
                         src -= rowBytes;
@@ -711,70 +720,297 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
                     dst += trimRowBytes;
                 }
                 // now point data to our copied version
-                data = tempStorage.get();
+                texels[currentMipLevel] = SkMipMapLevel(tempStorage.get(), trimRowBytes,
+                                                        texels[currentMipLevel].fWidth,
+                                                        texels[currentMipLevel].fHeight);
             }
         }
         if (glFlipY) {
-            GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
+            GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_TRUE));
         }
-        GL_CALL(PixelStorei(GR_GL_UNPACK_ALIGNMENT,
-              static_cast<GrGLint>(GrUnpackAlignment(dataConfig))));
+        GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_ALIGNMENT,
+                                           static_cast<GrGLint>(GrUnpackAlignment(desc.fConfig))));
     }
-    bool succeeded = true;
-    if (isNewTexture &&
-        0 == left && 0 == top &&
-        desc.fWidth == width && desc.fHeight == height) {
-        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-        if (useTexStorage) {
-            // We never resize  or change formats of textures.
-            GL_ALLOC_CALL(this->glInterface(),
-                          TexStorage2D(target,
-                                       1, // levels
-                                       internalFormat,
-                                       desc.fWidth, desc.fHeight));
+}
+
+/**
+ * Creates storage space for the texture and fills it with texels.
+ *
+ * @param desc           The surface descriptor for the texture being created.
+ * @param interface      The GL interface in use.
+ * @param useTexStorage  The result of a call to can_use_tex_storage().
+ * @param internalFormat The data format used for the internal storage of the texture.
+ * @param externalFormat The data format used for the external storage of the texture.
+ * @param externalType   The type of the data used for the external storage of the texture.
+ * @param texels         The texel data of the texture being created.
+ * @param succeeded      Set to true if allocating and populating the texture completed
+ *                       without error.
+ */
+static void allocate_and_populate_uncompressed_texture(const GrSurfaceDesc& desc,
+                                                       const GrGLInterface& interface,
+                                                       GrGLenum target,
+                                                       bool useTexStorage,
+                                                       GrGLenum internalFormat,
+                                                       GrGLenum externalFormat,
+                                                       GrGLenum externalType,
+                                                       const SkTArray<SkMipMapLevel>& texels,
+                                                       bool* succeeded) {
+    CLEAR_ERROR_BEFORE_ALLOC(&interface);
+    if (useTexStorage) {
+        // We never resize or change formats of textures.
+        GL_ALLOC_CALL(&interface,
+                      TexStorage2D(target,
+                                   texels.count(),
+                                   internalFormat,
+                                   desc.fWidth, desc.fHeight));
+
+        GrGLenum error = check_alloc_error(desc, &interface);
+        if (error != GR_GL_NO_ERROR) {
+            *succeeded = false;
         } else {
-            GL_ALLOC_CALL(this->glInterface(),
+            for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+                const void* currentMipData = texels[currentMipLevel].fTexels;
+                if (currentMipData == nullptr) {
+                    continue;
+                }
+
+                GR_GL_CALL(&interface,
+                           TexSubImage2D(target,
+                                         currentMipLevel,
+                                         0, // left
+                                         0, // top
+                                         texels[currentMipLevel].fWidth,
+                                         texels[currentMipLevel].fHeight,
+                                         externalFormat, externalType,
+                                         currentMipData));
+            }
+            *succeeded = true;
+        }
+    } else {
+        *succeeded = true;
+        for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+            GL_ALLOC_CALL(&interface,
                           TexImage2D(target,
-                                     0, // level
+                                     currentMipLevel,
                                      internalFormat,
-                                     desc.fWidth, desc.fHeight,
+                                     texels[currentMipLevel].fWidth,
+                                     texels[currentMipLevel].fHeight,
                                      0, // border
                                      externalFormat, externalType,
-                                     data));
+                                     texels[currentMipLevel].fTexels));
+            GrGLenum error = check_alloc_error(desc, &interface);
+            if (error != GR_GL_NO_ERROR) {
+                *succeeded = false;
+                break;
+            }
         }
-        GrGLenum error = check_alloc_error(desc, this->glInterface());
+    }
+}
+
+/**
+ * Creates storage space for the texture and fills it with texels.
+ *
+ * @param desc           The surface descriptor for the texture being created.
+ * @param interface      The GL interface in use.
+ * @param useTexStorage  The result of a call to can_use_tex_storage().
+ * @param internalFormat The data format used for the internal storage of the texture.
+ * @param texels         The texel data of the texture being created.
+ */
+static bool allocate_and_populate_compressed_texture(const GrSurfaceDesc& desc,
+                                                     const GrGLInterface& interface,
+                                                     GrGLenum target,
+                                                     bool useTexStorage, GrGLenum internalFormat,
+                                                     const SkTArray<SkMipMapLevel>& texels) {
+    CLEAR_ERROR_BEFORE_ALLOC(&interface);
+    if (useTexStorage) {
+        // We never resize or change formats of textures.
+        GL_ALLOC_CALL(&interface,
+                      TexStorage2D(target,
+                                   texels.count(),
+                                   internalFormat,
+                                   desc.fWidth, desc.fHeight));
+        GrGLenum error = check_alloc_error(desc, &interface);
         if (error != GR_GL_NO_ERROR) {
-            succeeded = false;
+            return false;
         } else {
-            // if we have data and we used TexStorage to create the texture, we
-            // now upload with TexSubImage.
-            if (data && useTexStorage) {
-                GL_CALL(TexSubImage2D(target,
-                                      0, // level
-                                      left, top,
-                                      width, height,
-                                      externalFormat, externalType,
-                                      data));
+            for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+                const void* currentMipData = texels[currentMipLevel].fTexels;
+                if (currentMipData == nullptr) {
+                    continue;
+                }
+
+                const uint32_t width = texels[currentMipLevel].fWidth;
+                const uint32_t height = texels[currentMipLevel].fHeight;
+
+                // Make sure that the width and height that we pass to OpenGL
+                // is a multiple of the block size.
+                size_t dataSize = GrCompressedFormatDataSize(desc.fConfig, width, height);
+                GR_GL_CALL(&interface, CompressedTexSubImage2D(target,
+                                                               currentMipLevel,
+                                                               0, // left
+                                                               0, // top
+                                                               width, height,
+                                                               internalFormat, SkToInt(dataSize),
+                                                               currentMipData));
             }
         }
     } else {
-        if (swFlipY || glFlipY) {
-            top = desc.fHeight - (top + height);
+        for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+            const uint32_t width = texels[currentMipLevel].fWidth;
+            const uint32_t height = texels[currentMipLevel].fHeight;
+
+            // Make sure that the width and height that we pass to OpenGL
+            // is a multiple of the block size.
+            size_t dataSize = GrCompressedFormatDataSize(desc.fConfig, width, height);
+
+            GL_ALLOC_CALL(&interface,
+                          CompressedTexImage2D(target,
+                                               texels.count(),
+                                               internalFormat,
+                                               width, height,
+                                               0, // border
+                                               SkToInt(dataSize),
+                                               texels[currentMipLevel].fTexels));
+
+            GrGLenum error = check_alloc_error(desc, &interface);
+            if (error != GR_GL_NO_ERROR) {
+                return false;
+            }
         }
-        GL_CALL(TexSubImage2D(target,
-                              0, // level
-                              left, top,
-                              width, height,
-                              externalFormat, externalType, data));
     }
+    return true;
+}
 
+/**
+ * After a texture is created, any state which was altered during its creation
+ * needs to be restored.
+ *
+ * @param interface          The GL interface to use.
+ * @param caps               The capabilities of the GL device.
+ * @param restoreGLRowLength Should the row length unpacking be restored?
+ * @param glFlipY            Did GL flip the texture vertically?
+ */
+static void restore_pixelstore_state(const GrGLInterface& interface, const GrGLCaps& caps,
+                                     bool restoreGLRowLength, bool glFlipY) {
     if (restoreGLRowLength) {
-        SkASSERT(this->glCaps().unpackRowLengthSupport());
-        GL_CALL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
+        SkASSERT(caps.unpackRowLengthSupport());
+        GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
     }
     if (glFlipY) {
-        GL_CALL(PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
+        GR_GL_CALL(&interface, PixelStorei(GR_GL_UNPACK_FLIP_Y, GR_GL_FALSE));
     }
+}
+
+bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
+                            GrGLenum target,
+                            bool isNewTexture,
+                            int left, int top, int width, int height,
+                            GrPixelConfig dataConfig,
+                            const SkTArray<SkMipMapLevel>& texels) {
+    // If we're uploading compressed data then we should be using uploadCompressedTexData
+    SkASSERT(!GrPixelConfigIsCompressed(dataConfig));
+
+    SkTArray<SkMipMapLevel> texelsCopy(texels);
+
+    for (int currentMipLevel = texelsCopy.count() - 1; currentMipLevel >= 0; currentMipLevel--) {
+        //SkASSERT(texelsCopy[currentMipLevel].fTexels || isNewTexture);
+    }
+
+
+    const GrGLInterface* interface = this->glInterface();
+    const GrGLCaps& caps = this->glCaps();
+    GrGLStandard standard = this->glStandard();
+    GrGLVersion version = this->glVersion();
+
+    size_t bpp = GrBytesPerPixel(dataConfig);
+    for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+        if (texelsCopy[currentMipLevel].fTexels == nullptr) {
+            continue;
+        }
+
+        if (texelsCopy[currentMipLevel].fHeight > SK_MaxS32
+            || texelsCopy[currentMipLevel].fWidth > SK_MaxS32) {
+            return false;
+        }
+        int currentMipHeight = texelsCopy[currentMipLevel].fHeight;
+        int currentMipWidth = texelsCopy[currentMipLevel].fWidth;
+        if (!GrSurfacePriv::AdjustWritePixelParams(desc.fWidth, desc.fHeight, bpp, &left, &top,
+                                               &currentMipWidth,
+                                               &currentMipHeight,
+                                               &texelsCopy[currentMipLevel].fTexels,
+                                               &texelsCopy[currentMipLevel].fRowBytes)) {
+            return false;
+        }
+        if (currentMipWidth < 0 || currentMipHeight < 0) {
+            return false;
+        }
+        texelsCopy[currentMipLevel].fWidth = currentMipWidth;
+        texelsCopy[currentMipLevel].fHeight = currentMipHeight;
+    }
+
+    bool useTexStorage = can_use_tex_storage(caps, standard, desc);
+    bool useSizedFormat = can_use_sized_format(useTexStorage, caps, standard, version, dataConfig);
+
+    GrGLenum internalFormat = 0x0; // suppress warning
+    GrGLenum externalFormat = 0x0; // suppress warning
+    GrGLenum externalType = 0x0;   // suppress warning
+
+    if (!this->configToGLFormats(dataConfig, useSizedFormat, &internalFormat,
+                                 &externalFormat, &externalType)) {
+        return false;
+    }
+
+    bool swFlipY = false;
+    bool glFlipY = false;
+
+    if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
+        if (caps.unpackFlipYSupport()) {
+            glFlipY = true;
+        } else {
+            swFlipY = true;
+        }
+    }
+
+    bool restoreGLRowLength = false;
+
+    // in case we need a temporary, trimmed copy of the src pixels
+#if defined(GOOGLE3)
+    // Stack frame size is limited in GOOGLE3.
+    SkAutoSMalloc<64 * 128> tempStorage;
+#else
+    SkAutoSMalloc<128 * 128> tempStorage;
+#endif
+
+    prepare_image_for_writing_to_texture(desc, caps, *interface, swFlipY, glFlipY, bpp, texelsCopy,
+                                         tempStorage, &restoreGLRowLength);
+    bool succeeded = true;
+    if (isNewTexture &&
+        0 == left && 0 == top &&
+        desc.fWidth == width && desc.fHeight == height) {
+        allocate_and_populate_uncompressed_texture(desc, *interface, useTexStorage, internalFormat,
+                                                   externalFormat, externalType, target,
+                                                   texelsCopy, &succeeded);
+    } else {
+        if (swFlipY || glFlipY) {
+            top = desc.fHeight - (top + height);
+        }
+        for (int currentMipLevel = 0; currentMipLevel < texelsCopy.count(); currentMipLevel++) {
+            if (texelsCopy[currentMipLevel].fTexels == nullptr) {
+                continue;
+            }
+
+            GL_CALL(TexSubImage2D(target,
+                                  currentMipLevel,
+                                  left, top,
+                                  texelsCopy[currentMipLevel].fWidth,
+                                  texelsCopy[currentMipLevel].fHeight,
+                                  externalFormat, externalType,
+                                  texelsCopy[currentMipLevel].fTexels));
+        }
+    }
+
+    restore_pixelstore_state(*interface, caps, restoreGLRowLength, glFlipY);
+
     return succeeded;
 }
 
@@ -785,14 +1021,18 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
 // see fit if they want to go against the "standard" way to do it.
 bool GrGLGpu::uploadCompressedTexData(const GrSurfaceDesc& desc,
                                       GrGLenum target,
-                                      const void* data,
+                                      const SkTArray<SkMipMapLevel>& texels,
                                       bool isNewTexture,
                                       int left, int top, int width, int height) {
-    SkASSERT(data || isNewTexture);
+    SkASSERT(isNewTexture);
 
     // No support for software flip y, yet...
     SkASSERT(kBottomLeft_GrSurfaceOrigin != desc.fOrigin);
 
+    const GrGLInterface* interface = this->glInterface();
+    const GrGLCaps& caps = this->glCaps();
+    GrGLStandard standard = this->glStandard();
+
     if (-1 == width) {
         width = desc.fWidth;
     }
@@ -811,9 +1051,7 @@ bool GrGLGpu::uploadCompressedTexData(const GrSurfaceDesc& desc,
     }
 #endif
 
-    // Make sure that the width and height that we pass to OpenGL
-    // is a multiple of the block size.
-    size_t dataSize = GrCompressedFormatDataSize(desc.fConfig, width, height);
+    bool useTexStorage = can_use_tex_storage(caps, standard, desc);
 
     // We only need the internal format for compressed 2D textures.
     GrGLenum internalFormat = 0;
@@ -822,31 +1060,32 @@ bool GrGLGpu::uploadCompressedTexData(const GrSurfaceDesc& desc,
     }
 
     if (isNewTexture) {
-        CLEAR_ERROR_BEFORE_ALLOC(this->glInterface());
-        GL_ALLOC_CALL(this->glInterface(),
-                      CompressedTexImage2D(target,
-                                           0, // level
-                                           internalFormat,
-                                           width, height,
-                                           0, // border
-                                           SkToInt(dataSize),
-                                           data));
-        GrGLenum error = check_alloc_error(desc, this->glInterface());
-        if (error != GR_GL_NO_ERROR) {
-            return false;
-        }
+        return allocate_and_populate_compressed_texture(desc, *interface, target, useTexStorage,
+                                                        internalFormat, texels);
     } else {
         // Paletted textures can't be updated.
         if (GR_GL_PALETTE8_RGBA8 == internalFormat) {
             return false;
         }
-        GL_CALL(CompressedTexSubImage2D(target,
-                                        0, // level
-                                        left, top,
-                                        width, height,
-                                        internalFormat,
-                                        SkToInt(dataSize),
-                                        data));
+        for (int currentMipLevel = 0; currentMipLevel < texels.count(); currentMipLevel++) {
+            if (texels[currentMipLevel].fTexels == nullptr) {
+                continue;
+            }
+
+            // Make sure that the width and height that we pass to OpenGL
+            // is a multiple of the block size.
+            size_t dataSize = GrCompressedFormatDataSize(desc.fConfig,
+                                                         texels[currentMipLevel].fWidth,
+                                                         texels[currentMipLevel].fHeight);
+            GL_CALL(CompressedTexSubImage2D(target,
+                                            currentMipLevel,
+                                            left, top,
+                                            texels[currentMipLevel].fWidth,
+                                            texels[currentMipLevel].fHeight,
+                                            internalFormat,
+                                            dataSize,
+                                            texels[currentMipLevel].fTexels));
+        }
     }
 
     return true;
@@ -1015,9 +1254,46 @@ static size_t as_size_t(int x) {
 }
 #endif
 
+static GrGLTexture::IDDesc generate_and_bind_gl_texture(const GrGLInterface* interface,
+                                                        GrGpuResource::LifeCycle lifeCycle) {
+    GrGLTexture::IDDesc idDesc;
+    GR_GL_CALL(interface, GenTextures(1, &idDesc.fTextureID));
+    idDesc.fLifeCycle = lifeCycle;
+    // We only support GL_TEXTURE_2D at the moment.
+    idDesc.fTarget = GR_GL_TEXTURE_2D;
+    return idDesc;
+}
+
+static GrGLTexture::TexParams set_initial_texture_params(const GrGLInterface* interface,
+                                                         GrGLTexture::IDDesc idDesc) {
+    // Some drivers like to know filter/wrap before seeing glTexImage2D. Some
+    // drivers have a bug where an FBO won't be complete if it includes a
+    // texture that is not mipmap complete (considering the filter in use).
+    GrGLTexture::TexParams initialTexParams;
+    // we only set a subset here so invalidate first
+    initialTexParams.invalidate();
+    initialTexParams.fMinFilter = GR_GL_NEAREST;
+    initialTexParams.fMagFilter = GR_GL_NEAREST;
+    initialTexParams.fWrapS = GR_GL_CLAMP_TO_EDGE;
+    initialTexParams.fWrapT = GR_GL_CLAMP_TO_EDGE;
+    GR_GL_CALL(interface, TexParameteri(idDesc.fTarget,
+                                        GR_GL_TEXTURE_MAG_FILTER,
+                                        initialTexParams.fMagFilter));
+    GR_GL_CALL(interface, TexParameteri(idDesc.fTarget,
+                                        GR_GL_TEXTURE_MIN_FILTER,
+                                        initialTexParams.fMinFilter));
+    GR_GL_CALL(interface, TexParameteri(idDesc.fTarget,
+                                        GR_GL_TEXTURE_WRAP_S,
+                                        initialTexParams.fWrapS));
+    GR_GL_CALL(interface, TexParameteri(idDesc.fTarget,
+                                        GR_GL_TEXTURE_WRAP_T,
+                                        initialTexParams.fWrapT));
+    return initialTexParams;
+}
+
 GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
                                     GrGpuResource::LifeCycle lifeCycle,
-                                    const void* srcData, size_t rowBytes) {
+                                    const SkTArray<SkMipMapLevel>& texels) {
     // We fail if the MSAA was requested and is not available.
     if (GrGLCaps::kNone_MSFBOType == this->glCaps().msFBOType() && desc.fSampleCnt) {
         //SkDebugf("MSAA RT requested but not supported on this platform.");
@@ -1026,12 +1302,7 @@ GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
 
     bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrSurfaceFlag);
 
-    GrGLTexture::IDDesc idDesc;
-    GL_CALL(GenTextures(1, &idDesc.fTextureID));
-    idDesc.fLifeCycle = lifeCycle;
-    // We only support GL_TEXTURE_2D at the moment.
-    idDesc.fTarget = GR_GL_TEXTURE_2D;
-
+    GrGLTexture::IDDesc idDesc = generate_and_bind_gl_texture(this->glInterface(), lifeCycle);
     if (!idDesc.fTextureID) {
         return return_null_texture();
     }
@@ -1046,31 +1317,12 @@ GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
                               GR_GL_FRAMEBUFFER_ATTACHMENT));
     }
 
-    // Some drivers like to know filter/wrap before seeing glTexImage2D. Some
-    // drivers have a bug where an FBO won't be complete if it includes a
-    // texture that is not mipmap complete (considering the filter in use).
-    GrGLTexture::TexParams initialTexParams;
-    // we only set a subset here so invalidate first
-    initialTexParams.invalidate();
-    initialTexParams.fMinFilter = GR_GL_NEAREST;
-    initialTexParams.fMagFilter = GR_GL_NEAREST;
-    initialTexParams.fWrapS = GR_GL_CLAMP_TO_EDGE;
-    initialTexParams.fWrapT = GR_GL_CLAMP_TO_EDGE;
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_MAG_FILTER,
-                          initialTexParams.fMagFilter));
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_MIN_FILTER,
-                          initialTexParams.fMinFilter));
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_WRAP_S,
-                          initialTexParams.fWrapS));
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_WRAP_T,
-                          initialTexParams.fWrapT));
-    if (!this->uploadTexData(desc, idDesc.fTarget, true, 0, 0,
+    GrGLTexture::TexParams initialTexParams = set_initial_texture_params(this->glInterface(),
+                                                                         idDesc);
+
+    if (!this->uploadTexData(desc, GR_GL_TEXTURE_2D, true, 0, 0,
                              desc.fWidth, desc.fHeight,
-                             desc.fConfig, srcData, rowBytes)) {
+                             desc.fConfig, texels)) {
         GL_CALL(DeleteTextures(1, &idDesc.fTextureID));
         return return_null_texture();
     }
@@ -1100,18 +1352,13 @@ GrTexture* GrGLGpu::onCreateTexture(const GrSurfaceDesc& desc,
 
 GrTexture* GrGLGpu::onCreateCompressedTexture(const GrSurfaceDesc& desc,
                                               GrGpuResource::LifeCycle lifeCycle,
-                                              const void* srcData) {
+                                              const SkTArray<SkMipMapLevel>& texels) {
     // Make sure that we're not flipping Y.
     if (kBottomLeft_GrSurfaceOrigin == desc.fOrigin) {
         return return_null_texture();
     }
 
-    GrGLTexture::IDDesc idDesc;
-    GL_CALL(GenTextures(1, &idDesc.fTextureID));
-    idDesc.fLifeCycle = lifeCycle;
-    // We only support GL_TEXTURE_2D at the moment.
-    idDesc.fTarget = GR_GL_TEXTURE_2D;
-
+    GrGLTexture::IDDesc idDesc = generate_and_bind_gl_texture(this->glInterface(), lifeCycle);
     if (!idDesc.fTextureID) {
         return return_null_texture();
     }
@@ -1119,30 +1366,10 @@ GrTexture* GrGLGpu::onCreateCompressedTexture(const GrSurfaceDesc& desc,
     this->setScratchTextureUnit();
     GL_CALL(BindTexture(idDesc.fTarget, idDesc.fTextureID));
 
-    // Some drivers like to know filter/wrap before seeing glTexImage2D. Some
-    // drivers have a bug where an FBO won't be complete if it includes a
-    // texture that is not mipmap complete (considering the filter in use).
-    GrGLTexture::TexParams initialTexParams;
-    // we only set a subset here so invalidate first
-    initialTexParams.invalidate();
-    initialTexParams.fMinFilter = GR_GL_NEAREST;
-    initialTexParams.fMagFilter = GR_GL_NEAREST;
-    initialTexParams.fWrapS = GR_GL_CLAMP_TO_EDGE;
-    initialTexParams.fWrapT = GR_GL_CLAMP_TO_EDGE;
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_MAG_FILTER,
-                          initialTexParams.fMagFilter));
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_MIN_FILTER,
-                          initialTexParams.fMinFilter));
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_WRAP_S,
-                          initialTexParams.fWrapS));
-    GL_CALL(TexParameteri(idDesc.fTarget,
-                          GR_GL_TEXTURE_WRAP_T,
-                          initialTexParams.fWrapT));
-
-    if (!this->uploadCompressedTexData(desc, idDesc.fTarget, srcData)) {
+    GrGLTexture::TexParams initialTexParams = set_initial_texture_params(this->glInterface(),
+                                                                         idDesc);
+
+    if (!this->uploadCompressedTexData(desc, idDesc.fTarget, texels)) {
         GL_CALL(DeleteTextures(1, &idDesc.fTextureID));
         return return_null_texture();
     }
@@ -2710,7 +2937,7 @@ bool GrGLGpu::configToGLFormats(GrPixelConfig config,
                 *externalType = GR_GL_HALF_FLOAT_OES;
             }
             break;
-            
+
         case kRGBA_half_GrPixelConfig:
             *internalFormat = GR_GL_RGBA16F;
             *externalFormat = GR_GL_RGBA;
@@ -2836,7 +3063,7 @@ void GrGLGpu::bindSurfaceFBOForCopy(GrSurface* surface, GrGLenum fboTarget, GrGL
 }
 
 void GrGLGpu::unbindTextureFBOForCopy(GrGLenum fboTarget, GrSurface* surface) {
-    // bindSurfaceFBOForCopy temporarily binds textures that are not render targets to 
+    // bindSurfaceFBOForCopy temporarily binds textures that are not render targets to
     if (!surface->asRenderTarget()) {
         SkASSERT(surface->asTexture());
         GrGLenum textureTarget = static_cast<GrGLTexture*>(surface->asTexture())->target();
@@ -2908,7 +3135,7 @@ bool GrGLGpu::onCopySurface(GrSurface* dst,
         this->copySurfaceAsDraw(dst, src, srcRect, dstPoint);
         return true;
     }
-    
+
     if (can_copy_texsubimage(dst, src, this)) {
         this->copySurfaceAsCopyTexSubImage(dst, src, srcRect, dstPoint);
         return true;
@@ -2932,7 +3159,7 @@ void GrGLGpu::createCopyProgram() {
     GrGLSLShaderVar uTexture("u_texture", kSampler2D_GrSLType, GrShaderVar::kUniform_TypeModifier);
     GrGLSLShaderVar vTexCoord("v_texCoord", kVec2f_GrSLType, GrShaderVar::kVaryingOut_TypeModifier);
     GrGLSLShaderVar oFragColor("o_FragColor", kVec4f_GrSLType, GrShaderVar::kOut_TypeModifier);
-    
+
     SkString vshaderTxt(version);
     aVertex.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
     vshaderTxt.append(";");
@@ -2942,7 +3169,7 @@ void GrGLGpu::createCopyProgram() {
     vshaderTxt.append(";");
     vTexCoord.appendDecl(this->glCaps().glslCaps(), &vshaderTxt);
     vshaderTxt.append(";");
-    
+
     vshaderTxt.append(
         "// Copy Program VS\n"
         "void main() {"
@@ -2977,7 +3204,7 @@ void GrGLGpu::createCopyProgram() {
         fsOutName,
         GrGLSLTexture2DFunctionName(kVec2f_GrSLType, this->glslGeneration())
     );
-    
+
     GL_CALL_RET(fCopyProgram.fProgram, CreateProgram());
     const char* str;
     GrGLint length;