Revert "Implementation of image decoding for bmp files, in accordance with the new API."

src/codec/SkMaskSwizzler.cpp

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkCodecPriv.h"
-#include "SkColorPriv.h"
-#include "SkMaskSwizzler.h"
-
-/*
- *
- * Row procedure for masked color components with 16 bits per pixel
- *
- */
-static SkSwizzler::ResultAlpha swizzle_mask16_to_n32(
-        void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
-
-    // Use the masks to decode to the destination
-    uint16_t* srcPtr = (uint16_t*) srcRow;
-    SkPMColor* dstPtr = (SkPMColor*) dstRow;
-    for (int i = 0; i < width; i++) {
-        uint16_t p = srcPtr[i];
-        uint8_t red = masks->getRed(p);
-        uint8_t green = masks->getGreen(p);
-        uint8_t blue = masks->getBlue(p);
-        dstPtr[i] = SkPackARGB32NoCheck(0xFF, red, green, blue);
-    }
-    return SkSwizzler::kOpaque_ResultAlpha;
-}
-
-/*
- *
- * Row procedure for masked color components with 16 bits per pixel with alpha
- *
- */
-static SkSwizzler::ResultAlpha swizzle_mask16_alpha_to_n32(
-        void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
-
-    // Use the masks to decode to the destination
-    uint16_t* srcPtr = (uint16_t*) srcRow;
-    SkPMColor* dstPtr = (SkPMColor*) dstRow;
-    INIT_RESULT_ALPHA;
-    for (int i = 0; i < width; i++) {
-        uint16_t p = srcPtr[i];
-        uint8_t red = masks->getRed(p);
-        uint8_t green = masks->getGreen(p);
-        uint8_t blue = masks->getBlue(p);
-        uint8_t alpha = masks->getAlpha(p);
-        UPDATE_RESULT_ALPHA(alpha);
-        dstPtr[i] = SkPackARGB32NoCheck(alpha, red, green, blue);
-    }
-    return COMPUTE_RESULT_ALPHA;
-}
-
-/*
- *
- * Row procedure for masked color components with 24 bits per pixel
- *
- */
-static SkSwizzler::ResultAlpha swizzle_mask24_to_n32(
-        void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
-
-    // Use the masks to decode to the destination
-    SkPMColor* dstPtr = (SkPMColor*) dstRow;
-    for (int i = 0; i < 3*width; i += 3) {
-        uint32_t p = srcRow[i] | (srcRow[i + 1] << 8) | srcRow[i + 2] << 16;
-        uint8_t red = masks->getRed(p);
-        uint8_t green = masks->getGreen(p);
-        uint8_t blue = masks->getBlue(p);
-        dstPtr[i/3] = SkPackARGB32NoCheck(0xFF, red, green, blue);
-    }
-    return SkSwizzler::kOpaque_ResultAlpha;
-}
-
-/*
- *
- * Row procedure for masked color components with 24 bits per pixel with alpha
- *
- */
-static SkSwizzler::ResultAlpha swizzle_mask24_alpha_to_n32(
-        void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
-
-    // Use the masks to decode to the destination
-    SkPMColor* dstPtr = (SkPMColor*) dstRow;
-    INIT_RESULT_ALPHA;
-    for (int i = 0; i < 3*width; i += 3) {
-        uint32_t p = srcRow[i] | (srcRow[i + 1] << 8) | srcRow[i + 2] << 16;
-        uint8_t red = masks->getRed(p);
-        uint8_t green = masks->getGreen(p);
-        uint8_t blue = masks->getBlue(p);
-        uint8_t alpha = masks->getAlpha(p);
-        UPDATE_RESULT_ALPHA(alpha);
-        dstPtr[i/3] = SkPackARGB32NoCheck(alpha, red, green, blue);
-    }
-    return COMPUTE_RESULT_ALPHA;
-}
-
-/*
- *
- * Row procedure for masked color components with 32 bits per pixel
- *
- */
-static SkSwizzler::ResultAlpha swizzle_mask32_to_n32(
-        void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
-
-    // Use the masks to decode to the destination
-    uint32_t* srcPtr = (uint32_t*) srcRow;
-    SkPMColor* dstPtr = (SkPMColor*) dstRow;
-    for (int i = 0; i < width; i++) {
-        uint32_t p = srcPtr[i];
-        uint8_t red = masks->getRed(p);
-        uint8_t green = masks->getGreen(p);
-        uint8_t blue = masks->getBlue(p);
-        dstPtr[i] = SkPackARGB32NoCheck(0xFF, red, green, blue);
-    }
-    return SkSwizzler::kOpaque_ResultAlpha;
-}
-
-/*
- *
- * Row procedure for masked color components with 32 bits per pixel
- *
- */
-static SkSwizzler::ResultAlpha swizzle_mask32_alpha_to_n32(
-        void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
-
-    // Use the masks to decode to the destination
-    uint32_t* srcPtr = (uint32_t*) srcRow;
-    SkPMColor* dstPtr = (SkPMColor*) dstRow;
-    INIT_RESULT_ALPHA;
-    for (int i = 0; i < width; i++) {
-        uint32_t p = srcPtr[i];
-        uint8_t red = masks->getRed(p);
-        uint8_t green = masks->getGreen(p);
-        uint8_t blue = masks->getBlue(p);
-        uint8_t alpha = masks->getAlpha(p);
-        UPDATE_RESULT_ALPHA(alpha);
-        dstPtr[i] = SkPackARGB32NoCheck(alpha, red, green, blue);
-    }
-    return COMPUTE_RESULT_ALPHA;
-}
-
-/*
- *
- * Create a new mask swizzler
- *
- */
-SkMaskSwizzler* SkMaskSwizzler::CreateMaskSwizzler(
-        const SkImageInfo& imageInfo, SkMasks* masks, uint32_t bitsPerPixel) {
-
-    // Choose the appropriate row procedure
-    RowProc proc = NULL;
-    uint32_t alphaMask = masks->getAlphaMask();
-    switch (bitsPerPixel) {
-        case 16:
-            if (0 == alphaMask) {
-                proc = &swizzle_mask16_to_n32;
-            } else {
-                proc = &swizzle_mask16_alpha_to_n32;
-            }
-            break;
-        case 24:
-            if (0 == alphaMask) {
-                proc = &swizzle_mask24_to_n32;
-            } else {
-                proc = &swizzle_mask24_alpha_to_n32;
-            }
-            break;
-        case 32:
-            if (0 == alphaMask) {
-                proc = &swizzle_mask32_to_n32;
-            } else {
-                proc = &swizzle_mask32_alpha_to_n32;
-            }
-            break;
-        default:
-            SkASSERT(false);
-            return NULL;
-    }
-    return SkNEW_ARGS(SkMaskSwizzler, (imageInfo, masks, proc));
-}
-
-/*
- *
- * Constructor for mask swizzler
- *
- */
-SkMaskSwizzler::SkMaskSwizzler(const SkImageInfo& imageInfo,
-                               SkMasks* masks, RowProc proc)
-    : fImageInfo(imageInfo)
-    , fMasks(masks)
-    , fRowProc(proc)
-{}
-
-/*
- *
- * Swizzle the next row
- *
- */
-SkSwizzler::ResultAlpha SkMaskSwizzler::next(void* dst,
-                                             const uint8_t* src) {
-    return fRowProc(dst, src, fImageInfo.width(), fMasks);
-}