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/*
* 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);
}
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