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

src/codec/SkCodecPriv.h

-/*
- * Copyright 2015 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkCodecPriv_DEFINED
-#define SkCodecPriv_DEFINED
-
-#include "SkImageInfo.h"
-#include "SkSwizzler.h"
-#include "SkTypes.h"
-
-/*
- *
- * Helper routine for alpha result codes
- *
- */
-#define INIT_RESULT_ALPHA                       \
-    uint8_t zeroAlpha = 0;                      \
-    uint8_t maxAlpha = 0xFF;
-
-#define UPDATE_RESULT_ALPHA(alpha)              \
-    zeroAlpha |= (alpha);                       \
-    maxAlpha  &= (alpha);
-
-#define COMPUTE_RESULT_ALPHA                    \
-    SkSwizzler::GetResult(zeroAlpha, maxAlpha);
-
-/*
- *
- * Compute row bytes for an image using pixels per byte
- *
- */
-static inline size_t compute_row_bytes_ppb(int width, uint32_t pixelsPerByte) {
-    return (width + pixelsPerByte - 1) / pixelsPerByte;
-}
-
-/*
- *
- * Compute row bytes for an image using bytes per pixel
- *
- */
-static inline size_t compute_row_bytes_bpp(int width, uint32_t bytesPerPixel) {
-    return width * bytesPerPixel;
-}
-
-/*
- *
- * Compute row bytes for an image
- *
- */
-static inline size_t compute_row_bytes(int width, uint32_t bitsPerPixel) {
-    if (bitsPerPixel < 16) {
-        SkASSERT(0 == 8 % bitsPerPixel);
-        const uint32_t pixelsPerByte = 8 / bitsPerPixel;
-        return compute_row_bytes_ppb(width, pixelsPerByte);
-    } else {
-        SkASSERT(0 == bitsPerPixel % 8);
-        const uint32_t bytesPerPixel = bitsPerPixel / 8;
-        return compute_row_bytes_bpp(width, bytesPerPixel);
-    }
-}
-
-/*
- *
- * Checks if alpha types are premul and unpremul
- *
- */
-static inline bool premul_and_unpremul(SkAlphaType dst, SkAlphaType src) {
-    return kPremul_SkAlphaType == dst && kUnpremul_SkAlphaType == src;
-}
-
-/*
- *
- * Get a byte from a buffer
- * This method is unsafe, the caller is responsible for performing a check
- *
- */
-static inline uint8_t get_byte(uint8_t* buffer, uint32_t i) {
-    return buffer[i];
-}
-
-/*
- *
- * Get a short from a buffer
- * This method is unsafe, the caller is responsible for performing a check
- *
- */
-static inline uint16_t get_short(uint8_t* buffer, uint32_t i) {
-    uint16_t result;
-    memcpy(&result, &(buffer[i]), 2);
-#ifdef SK_CPU_BENDIAN
-    return SkEndianSwap16(result);
-#else
-    return result;
-#endif
-}
-
-/*
- *
- * Get an int from a buffer
- * This method is unsafe, the caller is responsible for performing a check
- *
- */
-static inline uint32_t get_int(uint8_t* buffer, uint32_t i) {
-    uint32_t result;
-    memcpy(&result, &(buffer[i]), 4);
-#ifdef SK_CPU_BENDIAN
-    return SkEndianSwap32(result);
-#else
-    return result;
-#endif
-}
-
-#endif // SkCodecPriv_DEFINED