ARGB image encoder for checksums.

src/utils/SkBitmapTransformer.cpp

-
-/*
- * Copyright 2012 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 "SkBitmapTransformer.h"
-#include "SkColorPriv.h"
-#include "SkTypes.h"
-
-bool SkBitmapTransformer::isValid(bool logReason) const {
-    bool retval = true;
-
-    switch(fPixelFormat) {
-    case kARGB_8888_Premul_PixelFormat:
-        break;
-    default:
-        if (logReason) {
-            SkDEBUGF(("PixelFormat %d not supported\n", fPixelFormat));
-        }
-        retval = false;
-    }
-
-    SkBitmap::Config bitmapConfig = fBitmap.config();
-    switch(bitmapConfig) {
-    case SkBitmap::kARGB_8888_Config:
-        break;
-    default:
-        if (logReason) {
-            SkDEBUGF(("SkBitmap::Config %d not supported\n", bitmapConfig));
-        }
-        retval = false;
-    }
-
-    return retval;
-}
-
-/**
- * Transform from kARGB_8888_Config to kARGB_8888_Premul_PixelFormat.
- *
- * Similar to the various scanline transformers in
- * src/images/transform_scanline.h .
- */
-static void transform_scanline(const char* SK_RESTRICT src, int width,
-                               char* SK_RESTRICT dst) {
-    const SkPMColor* SK_RESTRICT srcP = reinterpret_cast<const SkPMColor*>(src);
-    for (int i = 0; i < width; i++) {
-        SkPMColor c = *srcP++;
-        unsigned a = SkGetPackedA32(c);
-        unsigned r = SkGetPackedR32(c);
-        unsigned g = SkGetPackedG32(c);
-        unsigned b = SkGetPackedB32(c);
-        *dst++ = a;
-        *dst++ = r;
-        *dst++ = g;
-        *dst++ = b;
-    }
-}
-
-bool SkBitmapTransformer::copyBitmapToPixelBuffer(void *dstBuffer,
-                                                  size_t dstBufferSize) const {
-    if (!this->isValid(true)) {
-        return false;
-    }
-    size_t bytesNeeded = this->bytesNeededTotal();
-    if (dstBufferSize < bytesNeeded) {
-        SkDEBUGF(("dstBufferSize %d must be >= %d\n", dstBufferSize, bytesNeeded));
-        return false;
-    }
-
-    fBitmap.lockPixels();
-    int width = fBitmap.width();
-    size_t srcRowBytes = fBitmap.rowBytes();
-    size_t dstRowBytes = this->bytesNeededPerRow();
-    const char *srcBytes = const_cast<const char *>(static_cast<char*>(fBitmap.getPixels()));
-    char *dstBytes = static_cast<char *>(dstBuffer);
-    for (int y = 0; y < fBitmap.height(); y++) {
-        transform_scanline(srcBytes, width, dstBytes);
-        srcBytes += srcRowBytes;
-        dstBytes += dstRowBytes;
-    }
-    fBitmap.unlockPixels();
-    return true;
-}