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/*
* Copyright 2012 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.
*/
/**
* Functions to transform scanlines between packed-pixel formats.
*/
#include "SkBitmap.h"
#include "SkColor.h"
#include "SkColorPriv.h"
#include "SkPreConfig.h"
#include "SkUnPreMultiply.h"
/**
* Function template for transforming scanlines.
* Transform 'width' pixels from 'src' buffer into 'dst' buffer,
* repacking color channel data as appropriate for the given transformation.
* 'bpp' is bytes per pixel in the 'src' buffer.
*/
typedef void (*transform_scanline_proc)(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int bpp);
/**
* Identity transformation: just copy bytes from src to dst.
*/
static void transform_scanline_memcpy(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int bpp) {
memcpy(dst, src, width * bpp);
}
/**
* Transform from kRGB_565_Config to 3-bytes-per-pixel RGB.
* Alpha channel data is not present in kRGB_565_Config format, so there is no
* alpha channel data to preserve.
*/
static void transform_scanline_565(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int) {
const uint16_t* srcP = (const uint16_t*)src;
for (int i = 0; i < width; i++) {
unsigned c = *srcP++;
*dst++ = SkPacked16ToR32(c);
*dst++ = SkPacked16ToG32(c);
*dst++ = SkPacked16ToB32(c);
}
}
/**
* Transform from kRGBA_8888_SkColorType to 3-bytes-per-pixel RGB.
* Alpha channel data is abandoned.
*/
static void transform_scanline_RGBX(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int) {
const uint32_t* srcP = (const SkPMColor*)src;
for (int i = 0; i < width; i++) {
uint32_t c = *srcP++;
*dst++ = (c >> 0) & 0xFF;
*dst++ = (c >> 8) & 0xFF;
*dst++ = (c >> 16) & 0xFF;
}
}
/**
* Transform from kBGRA_8888_SkColorType to 3-bytes-per-pixel RGB.
* Alpha channel data is abandoned.
*/
static void transform_scanline_BGRX(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int) {
const uint32_t* srcP = (const SkPMColor*)src;
for (int i = 0; i < width; i++) {
uint32_t c = *srcP++;
*dst++ = (c >> 16) & 0xFF;
*dst++ = (c >> 8) & 0xFF;
*dst++ = (c >> 0) & 0xFF;
}
}
/**
* Transform from kARGB_4444_Config to 3-bytes-per-pixel RGB.
* Alpha channel data, if any, is abandoned.
*/
static void transform_scanline_444(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int) {
const SkPMColor16* srcP = (const SkPMColor16*)src;
for (int i = 0; i < width; i++) {
SkPMColor16 c = *srcP++;
*dst++ = SkPacked4444ToR32(c);
*dst++ = SkPacked4444ToG32(c);
*dst++ = SkPacked4444ToB32(c);
}
}
template <bool kIsRGBA>
static inline void transform_scanline_unpremultiply(char* SK_RESTRICT dst,
const char* SK_RESTRICT src, int width, int) {
const uint32_t* srcP = (const SkPMColor*)src;
const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable();
for (int i = 0; i < width; i++) {
uint32_t c = *srcP++;
unsigned r, g, b, a;
if (kIsRGBA) {
r = (c >> 0) & 0xFF;
g = (c >> 8) & 0xFF;
b = (c >> 16) & 0xFF;
a = (c >> 24) & 0xFF;
} else {
r = (c >> 16) & 0xFF;
g = (c >> 8) & 0xFF;
b = (c >> 0) & 0xFF;
a = (c >> 24) & 0xFF;
}
if (0 != a && 255 != a) {
SkUnPreMultiply::Scale scale = table[a];
r = SkUnPreMultiply::ApplyScale(scale, r);
g = SkUnPreMultiply::ApplyScale(scale, g);
b = SkUnPreMultiply::ApplyScale(scale, b);
}
*dst++ = r;
*dst++ = g;
*dst++ = b;
*dst++ = a;
}
}
/**
* Transform from kPremul, kRGBA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA.
*/
static void transform_scanline_rgbA(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int bpp) {
transform_scanline_unpremultiply<true>(dst, src, width, bpp);
}
/**
* Transform from kPremul, kBGRA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA.
*/
static void transform_scanline_bgrA(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int bpp) {
transform_scanline_unpremultiply<false>(dst, src, width, bpp);
}
/**
* Transform from kUnpremul, kBGRA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA.
*/
static void transform_scanline_BGRA(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int) {
const uint32_t* srcP = (const SkPMColor*)src;
for (int i = 0; i < width; i++) {
uint32_t c = *srcP++;
*dst++ = (c >> 16) & 0xFF;
*dst++ = (c >> 8) & 0xFF;
*dst++ = (c >> 0) & 0xFF;
*dst++ = (c >> 24) & 0xFF;
}
}
/**
* Transform from kARGB_8888_Config to 4-bytes-per-pixel RGBA,
* with scaling of RGB based on alpha channel.
*/
static void transform_scanline_4444(char* SK_RESTRICT dst, const char* SK_RESTRICT src,
int width, int) {
const SkPMColor16* srcP = (const SkPMColor16*)src;
const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable();
for (int i = 0; i < width; i++) {
SkPMColor16 c = *srcP++;
unsigned a = SkPacked4444ToA32(c);
unsigned r = SkPacked4444ToR32(c);
unsigned g = SkPacked4444ToG32(c);
unsigned b = SkPacked4444ToB32(c);
if (0 != a && 255 != a) {
SkUnPreMultiply::Scale scale = table[a];
r = SkUnPreMultiply::ApplyScale(scale, r);
g = SkUnPreMultiply::ApplyScale(scale, g);
b = SkUnPreMultiply::ApplyScale(scale, b);
}
*dst++ = r;
*dst++ = g;
*dst++ = b;
*dst++ = a;
}
}
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