Creating functions for uploading a mipmapped texture.

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkGr.h"
 
+#include <memory>
+
 #include "GrCaps.h"
 #include "GrContext.h"
 #include "GrTextureParamsAdjuster.h"
 #include "GrGpuResourcePriv.h"
 #include "GrImageIDTextureAdjuster.h"
 #include "GrXferProcessor.h"
 #include "GrYUVProvider.h"
 
 #include "SkColorFilter.h"
 #include "SkConfig8888.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkErrorInternals.h"
 #include "SkGrPixelRef.h"
 #include "SkMessageBus.h"
+#include "SkMipMap.h"
+#include "SkMipMapLevel.h"
 #include "SkPixelRef.h"
 #include "SkResourceCache.h"
 #include "SkTextureCompressor.h"
 #include "SkYUVPlanesCache.h"
 #include "effects/GrBicubicEffect.h"
 #include "effects/GrConstColorProcessor.h"
 #include "effects/GrDitherEffect.h"
 #include "effects/GrPorterDuffXferProcessor.h"
 #include "effects/GrXfermodeFragmentProcessor.h"
 #include "effects/GrYUVtoRGBEffect.h"
@@ skipping 242 matching lines @@
         explicit Invalidator(const GrUniqueKey& key) : fMsg(key) {}
     private:
         GrUniqueKeyInvalidatedMessage fMsg;
 
         void onChange() override { SkMessageBus<GrUniqueKeyInvalidatedMessage>::Post(fMsg); }
     };
 
     pixelRef->addGenIDChangeListener(new Invalidator(key));
 }
 
+GrTexture* GrGenerateMipMapsAndUploadToTexture(GrContext* ctx, const SkBitmap& bitmap)
+{
+    GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bitmap.info());
+    if (kIndex_8_SkColorType != bitmap.colorType() && !bitmap.readyToDraw()) {
+        GrTexture *texture = load_etc1_texture(ctx, bitmap, desc);
+        if (texture) {
+            return texture;
+        }
+    }
+
+    GrTexture *texture = create_texture_from_yuv(ctx, bitmap, desc);
+    if (texture) {
+        return texture;
+    }
+
+    SkASSERT(sizeof(int) <= sizeof(uint32_t));
+    if (bitmap.width() < 0 || bitmap.height() < 0) {
+        return nullptr;
+    }
+
+    SkAutoLockPixels alp(bitmap);
+    if (!bitmap.readyToDraw()) {
+        return nullptr;
+    }
+
+    std::unique_ptr<SkMipMap> mipmaps(SkMipMap::Build(bitmap, nullptr));

[bsalomon, 2016/01/22 14:33:36]

We don't currently use unique_ptr in Skia. That is likely to change in the
future, but for consistency please use SkAutoTDelete

[cblume, 2016/02/24 07:59:24]

Done.

+    if (!mipmaps) {
+        return nullptr;
+    }
+
+    const int mipLevelCount = mipmaps->getLevelsCount();
+
+    const bool isMipMapped = mipLevelCount > 1;
+    desc.fIsMipMapped = isMipMapped;
+
+    SkTArray<SkMipMapLevel> texels(mipLevelCount);
+
+    SkMipMapLevel baseLevel(bitmap.getPixels(), bitmap.rowBytes(), bitmap.width(),
+                            bitmap.height());
+    texels.push_back(baseLevel);
+
+    for (int i = 1; i <= mipLevelCount; ++i) {
+        SkMipMap::Level generatedMipLevel;
+        mipmaps->getLevel(i, &generatedMipLevel);
+        SkMipMapLevel currentMipLevel(generatedMipLevel.fPixmap.addr(),
+                                      generatedMipLevel.fPixmap.rowBytes(),
+                                      generatedMipLevel.fPixmap.width(),
+                                      generatedMipLevel.fPixmap.height());
+        texels.push_back(currentMipLevel);
+    }
+
+    return ctx->textureProvider()->createTexture(desc, true, texels);
+}
+
 GrTexture* GrRefCachedBitmapTexture(GrContext* ctx, const SkBitmap& bitmap,
                                     const GrTextureParams& params) {
     if (bitmap.getTexture()) {
         return GrBitmapTextureAdjuster(&bitmap).refTextureSafeForParams(params, nullptr);
     }
     return GrBitmapTextureMaker(ctx, bitmap).refTextureForParams(params);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ skipping 329 matching lines @@
             SkErrorInternals::SetError( kInvalidPaint_SkError,
                                         "Sorry, I don't understand the filtering "
                                         "mode you asked for.  Falling back to "
                                         "MIPMaps.");
             textureFilterMode = GrTextureParams::kMipMap_FilterMode;
             break;
 
     }
     return textureFilterMode;
 }