Initial work to get ETC1 data up to the GPU

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 "SkColorFilter.h"
 #include "SkConfig8888.h"
+#include "SkData.h"
 #include "SkMessageBus.h"
 #include "SkPixelRef.h"
 #include "GrResourceCache.h"
+#include "GrGpu.h"
+#include "GrDrawTargetCaps.h"
+
+#include "etc1.h"
 
 /*  Fill out buffer with the compressed format Ganesh expects from a colortable
  based bitmap. [palette (colortable) + indices].
 
  At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
  we could detect that the colortable.count is <= 16, and then repack the
  indices as nibbles to save RAM, but it would take more time (i.e. a lot
  slower than memcpy), so skipping that for now.
 
  Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
@@ skipping 93 matching lines @@
     }
 };
 
 }  // namespace
 
 static void add_genID_listener(GrResourceKey key, SkPixelRef* pixelRef) {
     SkASSERT(NULL != pixelRef);
     pixelRef->addGenIDChangeListener(SkNEW_ARGS(GrResourceInvalidator, (key)));
 }
 
+static GrTexture *load_etc1_texture(GrContext* ctx,
+                                    const GrTextureParams* params,
+                                    const SkBitmap &bm, GrTextureDesc desc) {
+    SkData *data = bm.pixelRef()->refEncodedData();
+
+    // Is this even encoded data?
+    if (NULL == data) {
+        return NULL;
+    }
+
+    // Is this a valid PKM encoded data?
+    const uint8_t *bytes = data->bytes();
+    if (!etc1_pkm_is_valid(bytes)) {
+        return NULL;
+    }
+
+    uint32_t encodedWidth = etc1_pkm_get_width(bytes);
+    uint32_t encodedHeight = etc1_pkm_get_height(bytes);
+
+    // Does the data match the dimensions of the bitmap? If not,
+    // then we don't know how to scale the image to match it...
+    if (encodedWidth != static_cast<uint32_t>(bm.width()) ||
+        encodedHeight != static_cast<uint32_t>(bm.height())) {
+        return NULL;
+    }
+
+    // Everything seems good... skip ahead to the data.
+    bytes += ETC_PKM_HEADER_SIZE;
+    desc.fConfig = kETC1_GrPixelConfig;
+
+    // This texture is likely to be used again so leave it in the cache
+    GrCacheID cacheID;
+    generate_bitmap_cache_id(bm, &cacheID);
+
+    GrResourceKey key;
+    GrTexture* result = ctx->createTexture(params, desc, cacheID, bytes, 0, &key);
+    if (NULL != result) {
+        add_genID_listener(key, bm.pixelRef());
+    }
+    return result;
+}
+
 static GrTexture* sk_gr_create_bitmap_texture(GrContext* ctx,
                                               bool cache,
                                               const GrTextureParams* params,
                                               const SkBitmap& origBitmap) {
     SkBitmap tmpBitmap;
 
     const SkBitmap* bitmap = &origBitmap;
 
     GrTextureDesc desc;
     generate_bitmap_texture_desc(*bitmap, &desc);
@@ skipping 28 matching lines @@
                                     bitmap->height(), desc.fConfig,
                                     storage.get());
                 return result;
             }
         } else {
             origBitmap.copyTo(&tmpBitmap, kN32_SkColorType);
             // now bitmap points to our temp, which has been promoted to 32bits
             bitmap = &tmpBitmap;
             desc.fConfig = SkImageInfo2GrPixelConfig(bitmap->info());
         }
+
+    // Is this an ETC1 encoded texture?
+    } else if (cache && ctx->getGpu()->caps()->isConfigTexturable(kETC1_GrPixelConfig)) {
+        GrTexture *texture = load_etc1_texture(ctx, params, *bitmap, desc);
+        if (NULL != texture) {
+            return texture;
+        }
     }
 
     SkAutoLockPixels alp(*bitmap);
     if (!bitmap->readyToDraw()) {
         return NULL;
     }
     if (cache) {
         // This texture is likely to be used again so leave it in the cache
         GrCacheID cacheID;
         generate_bitmap_cache_id(origBitmap, &cacheID);
@@ skipping 247 matching lines @@
             copy.setShader(NULL);
             // modulate the paint alpha by the shader's solid color alpha
             U8CPU newA = SkMulDiv255Round(SkColorGetA(color), copy.getAlpha());
             copy.setColor(SkColorSetA(color, newA));
             SkPaint2GrPaintNoShader(context, copy, false, constantColor, grPaint);
         } else {
             SkPaint2GrPaintNoShader(context, skPaint, false, constantColor, grPaint);
         }
     }
 }