Revert of Add SkBitmap::readPixels() and reimplement copyTo and SkCanvas::readPixels

src/core/SkConfig8888.cpp

Index: src/core/SkConfig8888.cpp
diff --git a/src/core/SkConfig8888.cpp b/src/core/SkConfig8888.cpp
index b0572c0544c6a1eb15b4f01ee21c69813e6fceba..189309dae6e97b51c6d410a222f4880c2a831365 100644
--- a/src/core/SkConfig8888.cpp
+++ b/src/core/SkConfig8888.cpp
@@ -1,15 +1,5 @@
-/*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkBitmap.h"
-#include "SkCanvas.h"
 #include "SkConfig8888.h"
 #include "SkColorPriv.h"
-#include "SkDither.h"
 #include "SkMathPriv.h"
 #include "SkUnPreMultiply.h"
 
@@ -125,135 +115,3 @@
     }
     return true;
 }
-
-static void rect_memcpy(void* dst, size_t dstRB, const void* src, size_t srcRB, size_t bytesPerRow,
-                        int rowCount) {
-    SkASSERT(bytesPerRow <= srcRB);
-    SkASSERT(bytesPerRow <= dstRB);
-    for (int i = 0; i < rowCount; ++i) {
-        memcpy(dst, src, bytesPerRow);
-        dst = (char*)dst + dstRB;
-        src = (const char*)src + srcRB;
-    }
-}
-
-bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
-                             const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
-                             SkColorTable* ctable) {
-    if (srcInfo.dimensions() != dstInfo.dimensions()) {
-        return false;
-    }
-
-    const int width = srcInfo.width();
-    const int height = srcInfo.height();
-
-    // Handle fancy alpha swizzling if both are ARGB32
-    if (4 == srcInfo.bytesPerPixel() && 4 == dstInfo.bytesPerPixel()) {
-        SkDstPixelInfo dstPI;
-        dstPI.fColorType = dstInfo.colorType();
-        dstPI.fAlphaType = dstInfo.alphaType();
-        dstPI.fPixels = dstPixels;
-        dstPI.fRowBytes = dstRB;
-        
-        SkSrcPixelInfo srcPI;
-        srcPI.fColorType = srcInfo.colorType();
-        srcPI.fAlphaType = srcInfo.alphaType();
-        srcPI.fPixels = srcPixels;
-        srcPI.fRowBytes = srcRB;
-        
-        return srcPI.convertPixelsTo(&dstPI, width, height);
-    }
-
-    // If they agree on colorType and the alphaTypes are compatible, then we just memcpy.
-    // Note: we've already taken care of 32bit colortypes above.
-    if (srcInfo.colorType() == dstInfo.colorType()) {
-        switch (srcInfo.colorType()) {
-            case kRGB_565_SkColorType:
-            case kAlpha_8_SkColorType:
-                break;
-            case kIndex_8_SkColorType:
-            case kARGB_4444_SkColorType:
-                if (srcInfo.alphaType() != dstInfo.alphaType()) {
-                    return false;
-                }
-                break;
-            default:
-                return false;
-        }
-        rect_memcpy(dstPixels, dstRB, srcPixels, srcRB, width * srcInfo.bytesPerPixel(), height);
-        return true;
-    }
-
-    /*
-     *  Begin section where we try to change colorTypes along the way. Not all combinations
-     *  are supported.
-     */
-
-    // Can no longer draw directly into 4444, but we can manually whack it for a few combinations
-    if (kARGB_4444_SkColorType == dstInfo.colorType() &&
-        (kN32_SkColorType == srcInfo.colorType() || kIndex_8_SkColorType == srcInfo.colorType())) {
-        if (srcInfo.alphaType() == kUnpremul_SkAlphaType) {
-            // Our method for converting to 4444 assumes premultiplied.
-            return false;
-        }
-        
-        const SkPMColor* table = NULL;
-        if (kIndex_8_SkColorType == srcInfo.colorType()) {
-            if (NULL == ctable) {
-                return false;
-            }
-            table = ctable->lockColors();
-        }
-
-        for (int y = 0; y < height; ++y) {
-            DITHER_4444_SCAN(y);
-            SkPMColor16* SK_RESTRICT dstRow = (SkPMColor16*)dstPixels;
-            if (table) {
-                const uint8_t* SK_RESTRICT srcRow = (const uint8_t*)srcPixels;
-                for (int x = 0; x < width; ++x) {
-                    dstRow[x] = SkDitherARGB32To4444(table[srcRow[x]], DITHER_VALUE(x));
-                }
-            } else {
-                const SkPMColor* SK_RESTRICT srcRow = (const SkPMColor*)srcPixels;
-                for (int x = 0; x < width; ++x) {
-                    dstRow[x] = SkDitherARGB32To4444(srcRow[x], DITHER_VALUE(x));
-                }
-            }
-            dstPixels = (char*)dstPixels + dstRB;
-            srcPixels = (const char*)srcPixels + srcRB;
-        }
-        
-        if (table) {
-            ctable->unlockColors();
-        }
-        return true;
-    }
-
-    if (dstInfo.alphaType() == kUnpremul_SkAlphaType) {
-        // We do not support drawing to unpremultiplied bitmaps.
-        return false;
-    }
-
-    // Final fall-back, draw with a canvas
-    //
-    // Always clear the dest in case one of the blitters accesses it
-    // TODO: switch the allocation of tmpDst to call sk_calloc_throw
-    {
-        SkBitmap bm;
-        if (!bm.installPixels(srcInfo, const_cast<void*>(srcPixels), srcRB, ctable, NULL, NULL)) {
-            return false;
-        }
-        SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterDirect(dstInfo, dstPixels, dstRB));
-        if (NULL == canvas.get()) {
-            return false;
-        }
-
-        SkPaint  paint;
-        paint.setDither(true);
-
-        canvas->clear(0);
-        canvas->drawBitmap(bm, 0, 0, &paint);
-        return true;
-    }
-}
-