Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / skia / 8e17556349132a46c02fbabcaf74b63f521528e0 / . / src / codec / SkSwizzler.cpp
blob: 133736879f203e53e5962dab4a4530ad3f5f93f7 [file] [log] [blame]
/*
* 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 "SkOpts.h"
#include "SkSwizzler.h"
#include "SkTemplates.h"
static void copy(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
memcpy(dst, src + offset, width * bpp);
}
static void sample1(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
src += offset;
uint8_t* dst8 = (uint8_t*) dst;
for (int x = 0; x < width; x++) {
dst8[x] = *src;
src += deltaSrc;
}
}
static void sample2(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
src += offset;
uint16_t* dst16 = (uint16_t*) dst;
for (int x = 0; x < width; x++) {
dst16[x] = *((const uint16_t*) src);
src += deltaSrc;
}
}
static void sample4(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
src += offset;
uint32_t* dst32 = (uint32_t*) dst;
for (int x = 0; x < width; x++) {
dst32[x] = *((const uint32_t*) src);
src += deltaSrc;
}
}
// kBit
// These routines exclusively choose between white and black
#define GRAYSCALE_BLACK 0
#define GRAYSCALE_WHITE 0xFF
// same as swizzle_bit_to_index and swizzle_bit_to_n32 except for value assigned to dst[x]
static void swizzle_bit_to_grayscale(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
// increment src by byte offset and bitIndex by bit offset
src += offset / 8;
int bitIndex = offset % 8;
uint8_t currByte = *src;
dst[0] = ((currByte >> (7-bitIndex)) & 1) ? GRAYSCALE_WHITE : GRAYSCALE_BLACK;
for (int x = 1; x < dstWidth; x++) {
int bitOffset = bitIndex + deltaSrc;
bitIndex = bitOffset % 8;
currByte = *(src += bitOffset / 8);
dst[x] = ((currByte >> (7-bitIndex)) & 1) ? GRAYSCALE_WHITE : GRAYSCALE_BLACK;
}
}
#undef GRAYSCALE_BLACK
#undef GRAYSCALE_WHITE
// same as swizzle_bit_to_grayscale and swizzle_bit_to_n32 except for value assigned to dst[x]
static void swizzle_bit_to_index(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
// increment src by byte offset and bitIndex by bit offset
src += offset / 8;
int bitIndex = offset % 8;
uint8_t currByte = *src;
dst[0] = ((currByte >> (7-bitIndex)) & 1);
for (int x = 1; x < dstWidth; x++) {
int bitOffset = bitIndex + deltaSrc;
bitIndex = bitOffset % 8;
currByte = *(src += bitOffset / 8);
dst[x] = ((currByte >> (7-bitIndex)) & 1);
}
}
// same as swizzle_bit_to_grayscale and swizzle_bit_to_index except for value assigned to dst[x]
static void swizzle_bit_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*) dstRow;
// increment src by byte offset and bitIndex by bit offset
src += offset / 8;
int bitIndex = offset % 8;
uint8_t currByte = *src;
dst[0] = ((currByte >> (7 - bitIndex)) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
for (int x = 1; x < dstWidth; x++) {
int bitOffset = bitIndex + deltaSrc;
bitIndex = bitOffset % 8;
currByte = *(src += bitOffset / 8);
dst[x] = ((currByte >> (7 - bitIndex)) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
}
}
#define RGB565_BLACK 0
#define RGB565_WHITE 0xFFFF
static void swizzle_bit_to_565(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
uint16_t* SK_RESTRICT dst = (uint16_t*) dstRow;
// increment src by byte offset and bitIndex by bit offset
src += offset / 8;
int bitIndex = offset % 8;
uint8_t currByte = *src;
dst[0] = ((currByte >> (7 - bitIndex)) & 1) ? RGB565_WHITE : RGB565_BLACK;
for (int x = 1; x < dstWidth; x++) {
int bitOffset = bitIndex + deltaSrc;
bitIndex = bitOffset % 8;
currByte = *(src += bitOffset / 8);
dst[x] = ((currByte >> (7 - bitIndex)) & 1) ? RGB565_WHITE : RGB565_BLACK;
}
}
#undef RGB565_BLACK
#undef RGB565_WHITE
// kIndex1, kIndex2, kIndex4
static void swizzle_small_index_to_index(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
uint8_t* dst = (uint8_t*) dstRow;
src += offset / 8;
int bitIndex = offset % 8;
uint8_t currByte = *src;
const uint8_t mask = (1 << bpp) - 1;
uint8_t index = (currByte >> (8 - bpp - bitIndex)) & mask;
dst[0] = index;
for (int x = 1; x < dstWidth; x++) {
int bitOffset = bitIndex + deltaSrc;
bitIndex = bitOffset % 8;
currByte = *(src += bitOffset / 8);
index = (currByte >> (8 - bpp - bitIndex)) & mask;
dst[x] = index;
}
}
static void swizzle_small_index_to_565(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
uint16_t* dst = (uint16_t*) dstRow;
src += offset / 8;
int bitIndex = offset % 8;
uint8_t currByte = *src;
const uint8_t mask = (1 << bpp) - 1;
uint8_t index = (currByte >> (8 - bpp - bitIndex)) & mask;
dst[0] = SkPixel32ToPixel16(ctable[index]);
for (int x = 1; x < dstWidth; x++) {
int bitOffset = bitIndex + deltaSrc;
bitIndex = bitOffset % 8;
currByte = *(src += bitOffset / 8);
index = (currByte >> (8 - bpp - bitIndex)) & mask;
dst[x] = SkPixel32ToPixel16(ctable[index]);
}
}
static void swizzle_small_index_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
SkPMColor* dst = (SkPMColor*) dstRow;
src += offset / 8;
int bitIndex = offset % 8;
uint8_t currByte = *src;
const uint8_t mask = (1 << bpp) - 1;
uint8_t index = (currByte >> (8 - bpp - bitIndex)) & mask;
dst[0] = ctable[index];
for (int x = 1; x < dstWidth; x++) {
int bitOffset = bitIndex + deltaSrc;
bitIndex = bitOffset % 8;
currByte = *(src += bitOffset / 8);
index = (currByte >> (8 - bpp - bitIndex)) & mask;
dst[x] = ctable[index];
}
}
// kIndex
static void swizzle_index_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
SkPMColor c = ctable[*src];
dst[x] = c;
src += deltaSrc;
}
}
static void swizzle_index_to_n32_skipZ(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
SkPMColor c = ctable[*src];
if (c != 0) {
dst[x] = c;
}
src += deltaSrc;
}
}
static void swizzle_index_to_565(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bytesPerPixel, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPixel32ToPixel16(ctable[*src]);
src += deltaSrc;
}
}
// kGray
static void swizzle_gray_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPackARGB32NoCheck(0xFF, *src, *src, *src);
src += deltaSrc;
}
}
static void fast_swizzle_gray_to_n32(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
// Note that there is no need to distinguish between RGB and BGR.
// Each color channel will get the same value.
SkOpts::gray_to_RGB1((uint32_t*) dst, src + offset, width);
}
static void swizzle_gray_to_565(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bytesPerPixel, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPack888ToRGB16(src[0], src[0], src[0]);
src += deltaSrc;
}
}
// kGrayAlpha
static void swizzle_grayalpha_to_n32_unpremul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
src += offset;
SkPMColor* dst32 = (SkPMColor*) dst;
for (int x = 0; x < width; x++) {
dst32[x] = SkPackARGB32NoCheck(src[1], src[0], src[0], src[0]);
src += deltaSrc;
}
}
static void fast_swizzle_grayalpha_to_n32_unpremul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
// Note that there is no need to distinguish between RGB and BGR.
// Each color channel will get the same value.
SkOpts::grayA_to_RGBA((uint32_t*) dst, src + offset, width);
}
static void swizzle_grayalpha_to_n32_premul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
src += offset;
SkPMColor* dst32 = (SkPMColor*) dst;
for (int x = 0; x < width; x++) {
uint8_t pmgray = SkMulDiv255Round(src[1], src[0]);
dst32[x] = SkPackARGB32NoCheck(src[1], pmgray, pmgray, pmgray);
src += deltaSrc;
}
}
static void fast_swizzle_grayalpha_to_n32_premul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
// Note that there is no need to distinguish between rgb and bgr.
// Each color channel will get the same value.
SkOpts::grayA_to_rgbA((uint32_t*) dst, src + offset, width);
}
// kBGRX
static void swizzle_bgrx_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPackARGB32NoCheck(0xFF, src[2], src[1], src[0]);
src += deltaSrc;
}
}
static void swizzle_bgrx_to_565(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPack888ToRGB16(src[2], src[1], src[0]);
src += deltaSrc;
}
}
// kBGRA
static void swizzle_bgra_to_n32_unpremul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
uint8_t alpha = src[3];
dst[x] = SkPackARGB32NoCheck(alpha, src[2], src[1], src[0]);
src += deltaSrc;
}
}
static void fast_swizzle_bgra_to_n32_unpremul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
#ifdef SK_PMCOLOR_IS_RGBA
SkOpts::RGBA_to_BGRA((uint32_t*) dst, src + offset, width);
#else
memcpy(dst, src + offset, width * bpp);
#endif
}
static void swizzle_bgra_to_n32_premul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
uint8_t alpha = src[3];
dst[x] = SkPremultiplyARGBInline(alpha, src[2], src[1], src[0]);
src += deltaSrc;
}
}
static void fast_swizzle_bgra_to_n32_premul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
#ifdef SK_PMCOLOR_IS_RGBA
SkOpts::RGBA_to_bgrA((uint32_t*) dst, src + offset, width);
#else
SkOpts::RGBA_to_rgbA((uint32_t*) dst, src + offset, width);
#endif
}
// kRGB
static void swizzle_rgb_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPackARGB32NoCheck(0xFF, src[0], src[1], src[2]);
src += deltaSrc;
}
}
static void fast_swizzle_rgb_to_n32(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc,
int offset, const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
#ifdef SK_PMCOLOR_IS_RGBA
SkOpts::RGB_to_RGB1((uint32_t*) dst, src + offset, width);
#else
SkOpts::RGB_to_BGR1((uint32_t*) dst, src + offset, width);
#endif
}
static void swizzle_rgb_to_565(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bytesPerPixel, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPack888ToRGB16(src[0], src[1], src[2]);
src += deltaSrc;
}
}
// kRGBA
static void swizzle_rgba_to_n32_premul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
unsigned alpha = src[3];
dst[x] = SkPremultiplyARGBInline(alpha, src[0], src[1], src[2]);
src += deltaSrc;
}
}
static void fast_swizzle_rgba_to_n32_premul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc,
int offset, const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
#ifdef SK_PMCOLOR_IS_RGBA
SkOpts::RGBA_to_rgbA((uint32_t*) dst, src + offset, width);
#else
SkOpts::RGBA_to_bgrA((uint32_t*) dst, src + offset, width);
#endif
}
static void swizzle_rgba_to_n32_unpremul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
uint32_t* SK_RESTRICT dst = reinterpret_cast<uint32_t*>(dstRow);
for (int x = 0; x < dstWidth; x++) {
unsigned alpha = src[3];
dst[x] = SkPackARGB32NoCheck(alpha, src[0], src[1], src[2]);
src += deltaSrc;
}
}
static void fast_swizzle_rgba_to_n32_unpremul(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
#ifdef SK_PMCOLOR_IS_RGBA
memcpy(dst, src + offset, width * bpp);
#else
SkOpts::RGBA_to_BGRA((uint32_t*) dst, src + offset, width);
#endif
}
// kCMYK
//
// CMYK is stored as four bytes per pixel.
//
// We will implement a crude conversion from CMYK -> RGB using formulas
// from easyrgb.com.
//
// CMYK -> CMY
// C = C * (1 - K) + K
// M = M * (1 - K) + K
// Y = Y * (1 - K) + K
//
// libjpeg actually gives us inverted CMYK, so we must subtract the
// original terms from 1.
// CMYK -> CMY
// C = (1 - C) * (1 - (1 - K)) + (1 - K)
// M = (1 - M) * (1 - (1 - K)) + (1 - K)
// Y = (1 - Y) * (1 - (1 - K)) + (1 - K)
//
// Simplifying the above expression.
// CMYK -> CMY
// C = 1 - CK
// M = 1 - MK
// Y = 1 - YK
//
// CMY -> RGB
// R = (1 - C) * 255
// G = (1 - M) * 255
// B = (1 - Y) * 255
//
// Therefore the full conversion is below. This can be verified at
// www.rapidtables.com (assuming inverted CMYK).
// CMYK -> RGB
// R = C * K * 255
// G = M * K * 255
// B = Y * K * 255
//
// As a final note, we have treated the CMYK values as if they were on
// a scale from 0-1, when in fact they are 8-bit ints scaling from 0-255.
// We must divide each CMYK component by 255 to obtain the true conversion
// we should perform.
// CMYK -> RGB
// R = C * K / 255
// G = M * K / 255
// B = Y * K / 255
static void swizzle_cmyk_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < dstWidth; x++) {
const uint8_t r = SkMulDiv255Round(src[0], src[3]);
const uint8_t g = SkMulDiv255Round(src[1], src[3]);
const uint8_t b = SkMulDiv255Round(src[2], src[3]);
dst[x] = SkPackARGB32NoCheck(0xFF, r, g, b);
src += deltaSrc;
}
}
static void fast_swizzle_cmyk_to_n32(
void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
const SkPMColor ctable[]) {
// This function must not be called if we are sampling. If we are not
// sampling, deltaSrc should equal bpp.
SkASSERT(deltaSrc == bpp);
#ifdef SK_PMCOLOR_IS_RGBA
SkOpts::inverted_CMYK_to_RGB1((uint32_t*) dst, src + offset, width);
#else
SkOpts::inverted_CMYK_to_BGR1((uint32_t*) dst, src + offset, width);
#endif
}
static void swizzle_cmyk_to_565(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
for (int x = 0; x < dstWidth; x++) {
const uint8_t r = SkMulDiv255Round(src[0], src[3]);
const uint8_t g = SkMulDiv255Round(src[1], src[3]);
const uint8_t b = SkMulDiv255Round(src[2], src[3]);
dst[x] = SkPack888ToRGB16(r, g, b);
src += deltaSrc;
}
}
template <SkSwizzler::RowProc proc>
void SkSwizzler::SkipLeadingGrayAlphaZerosThen(
void* dst, const uint8_t* src, int width,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
SkASSERT(!ctable);
const uint16_t* src16 = (const uint16_t*) (src + offset);
uint32_t* dst32 = (uint32_t*) dst;
// This may miss opportunities to skip when the output is premultiplied,
// e.g. for a src pixel 0x00FF which is not zero but becomes zero after premultiplication.
while (width > 0 && *src16 == 0x0000) {
width--;
dst32++;
src16 += deltaSrc / 2;
}
proc(dst32, (const uint8_t*)src16, width, bpp, deltaSrc, 0, ctable);
}
template <SkSwizzler::RowProc proc>
void SkSwizzler::SkipLeading8888ZerosThen(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
SkASSERT(!ctable);
auto src32 = (const uint32_t*)(src+offset);
auto dst32 = (uint32_t*)dstRow;
// This may miss opportunities to skip when the output is premultiplied,
// e.g. for a src pixel 0x00FFFFFF which is not zero but becomes zero after premultiplication.
while (dstWidth > 0 && *src32 == 0x00000000) {
dstWidth--;
dst32++;
src32 += deltaSrc/4;
}
proc(dst32, (const uint8_t*)src32, dstWidth, bpp, deltaSrc, 0, ctable);
}
SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
const SkPMColor* ctable,
const SkImageInfo& dstInfo,
const SkCodec::Options& options,
const SkIRect* frame) {
if (dstInfo.colorType() == kUnknown_SkColorType || kUnknown == sc) {
return nullptr;
}
if ((kIndex == sc || kIndex4 == sc || kIndex2 == sc || kIndex1 == sc)
&& nullptr == ctable) {
return nullptr;
}
RowProc fastProc = nullptr;
RowProc proc = nullptr;
SkCodec::ZeroInitialized zeroInit = options.fZeroInitialized;
switch (sc) {
case kBit:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_bit_to_n32;
break;
case kIndex_8_SkColorType:
proc = &swizzle_bit_to_index;
break;
case kRGB_565_SkColorType:
proc = &swizzle_bit_to_565;
break;
case kGray_8_SkColorType:
proc = &swizzle_bit_to_grayscale;
break;
default:
break;
}
break;
case kIndex1:
case kIndex2:
case kIndex4:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_small_index_to_n32;
break;
case kRGB_565_SkColorType:
proc = &swizzle_small_index_to_565;
break;
case kIndex_8_SkColorType:
proc = &swizzle_small_index_to_index;
break;
default:
break;
}
break;
case kIndex:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
// We assume the color premultiplied ctable (or not) as desired.
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
proc = &swizzle_index_to_n32_skipZ;
break;
} else {
proc = &swizzle_index_to_n32;
break;
}
break;
case kRGB_565_SkColorType:
proc = &swizzle_index_to_565;
break;
case kIndex_8_SkColorType:
proc = &sample1;
fastProc = &copy;
break;
default:
break;
}
break;
case kGray:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_gray_to_n32;
fastProc = &fast_swizzle_gray_to_n32;
break;
case kGray_8_SkColorType:
proc = &sample1;
fastProc = &copy;
break;
case kRGB_565_SkColorType:
proc = &swizzle_gray_to_565;
break;
default:
break;
}
break;
case kGrayAlpha:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
if (dstInfo.alphaType() == kUnpremul_SkAlphaType) {
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
proc = &SkipLeadingGrayAlphaZerosThen
<swizzle_grayalpha_to_n32_unpremul>;
fastProc = &SkipLeadingGrayAlphaZerosThen
<fast_swizzle_grayalpha_to_n32_unpremul>;
} else {
proc = &swizzle_grayalpha_to_n32_unpremul;
fastProc = &fast_swizzle_grayalpha_to_n32_unpremul;
}
} else {
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
proc = &SkipLeadingGrayAlphaZerosThen<swizzle_grayalpha_to_n32_premul>;
fastProc = &SkipLeadingGrayAlphaZerosThen
<fast_swizzle_grayalpha_to_n32_premul>;
} else {
proc = &swizzle_grayalpha_to_n32_premul;
fastProc = &fast_swizzle_grayalpha_to_n32_premul;
}
}
break;
default:
break;
}
break;
case kBGR:
case kBGRX:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_bgrx_to_n32;
break;
case kRGB_565_SkColorType:
proc = &swizzle_bgrx_to_565;
break;
default:
break;
}
break;
case kBGRA:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
if (dstInfo.alphaType() == kUnpremul_SkAlphaType) {
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
proc = &SkipLeading8888ZerosThen<swizzle_bgra_to_n32_unpremul>;
fastProc = &SkipLeading8888ZerosThen<fast_swizzle_bgra_to_n32_unpremul>;
} else {
proc = &swizzle_bgra_to_n32_unpremul;
fastProc = &fast_swizzle_bgra_to_n32_unpremul;
}
} else {
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
proc = &SkipLeading8888ZerosThen<swizzle_bgra_to_n32_premul>;
fastProc = &SkipLeading8888ZerosThen<fast_swizzle_bgra_to_n32_premul>;
} else {
proc = &swizzle_bgra_to_n32_premul;
fastProc = &fast_swizzle_bgra_to_n32_premul;
}
}
break;
default:
break;
}
break;
case kRGB:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_rgb_to_n32;
fastProc = &fast_swizzle_rgb_to_n32;
break;
case kRGB_565_SkColorType:
proc = &swizzle_rgb_to_565;
break;
default:
break;
}
break;
case kRGBA:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
if (dstInfo.alphaType() == kUnpremul_SkAlphaType) {
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_n32_unpremul>;
fastProc = &SkipLeading8888ZerosThen<fast_swizzle_rgba_to_n32_unpremul>;
} else {
proc = &swizzle_rgba_to_n32_unpremul;
fastProc = &fast_swizzle_rgba_to_n32_unpremul;
}
} else {
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_n32_premul>;
fastProc = &SkipLeading8888ZerosThen<fast_swizzle_rgba_to_n32_premul>;
} else {
proc = &swizzle_rgba_to_n32_premul;
fastProc = &fast_swizzle_rgba_to_n32_premul;
}
}
break;
default:
break;
}
break;
case kCMYK:
switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_cmyk_to_n32;
fastProc = &fast_swizzle_cmyk_to_n32;
break;
case kRGB_565_SkColorType:
proc = &swizzle_cmyk_to_565;
break;
default:
break;
}
break;
case kNoOp8:
proc = &sample1;
fastProc = &copy;
break;
case kNoOp16:
proc = sample2;
fastProc = &copy;
break;
case kNoOp32:
proc = &sample4;
fastProc = &copy;
break;
default:
break;
}
// Store bpp in bytes if it is an even multiple, otherwise use bits
int srcBPP = SkIsAlign8(BitsPerPixel(sc)) ? BytesPerPixel(sc) : BitsPerPixel(sc);
int dstBPP = SkColorTypeBytesPerPixel(dstInfo.colorType());
int srcOffset = 0;
int srcWidth = dstInfo.width();
int dstOffset = 0;
int dstWidth = srcWidth;
if (options.fSubset) {
// We do not currently support subset decodes for image types that may have
// frames (gif).
SkASSERT(!frame);
srcOffset = options.fSubset->left();
srcWidth = options.fSubset->width();
dstWidth = srcWidth;
} else if (frame) {
dstOffset = frame->left();
srcWidth = frame->width();
}
return new SkSwizzler(fastProc, proc, ctable, srcOffset, srcWidth, dstOffset, dstWidth,
srcBPP, dstBPP);
}
SkSwizzler::SkSwizzler(RowProc fastProc, RowProc proc, const SkPMColor* ctable, int srcOffset,
int srcWidth, int dstOffset, int dstWidth, int srcBPP, int dstBPP)
: fFastProc(fastProc)
, fSlowProc(proc)
, fActualProc(fFastProc ? fFastProc : fSlowProc)
, fColorTable(ctable)
, fSrcOffset(srcOffset)
, fDstOffset(dstOffset)
, fSrcOffsetUnits(srcOffset * srcBPP)
, fDstOffsetBytes(dstOffset * dstBPP)
, fSrcWidth(srcWidth)
, fDstWidth(dstWidth)
, fSwizzleWidth(srcWidth)
, fAllocatedWidth(dstWidth)
, fSampleX(1)
, fSrcBPP(srcBPP)
, fDstBPP(dstBPP)
{}
int SkSwizzler::onSetSampleX(int sampleX) {
SkASSERT(sampleX > 0);
fSampleX = sampleX;
fSrcOffsetUnits = (get_start_coord(sampleX) + fSrcOffset) * fSrcBPP;
fDstOffsetBytes = (fDstOffset / sampleX) * fDstBPP;
fSwizzleWidth = get_scaled_dimension(fSrcWidth, sampleX);
fAllocatedWidth = get_scaled_dimension(fDstWidth, sampleX);
// The optimized swizzler functions do not support sampling. Sampled swizzles
// are already fast because they skip pixels. We haven't seen a situation
// where speeding up sampling has a significant impact on total decode time.
if (1 == fSampleX && fFastProc) {
fActualProc = fFastProc;
} else {
fActualProc = fSlowProc;
}
return fAllocatedWidth;
}
void SkSwizzler::swizzle(void* dst, const uint8_t* SK_RESTRICT src) {
SkASSERT(nullptr != dst && nullptr != src);
fActualProc(SkTAddOffset<void>(dst, fDstOffsetBytes), src, fSwizzleWidth, fSrcBPP,
fSampleX * fSrcBPP, fSrcOffsetUnits, fColorTable);
}