/*
* Copyright 2006 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.
*/
#include "SkCoreBlitters.h"
#include "SkColorPriv.h"
#include "SkShader.h"
#include "SkXfermode.h"
SkA8_Blitter::SkA8_Blitter(const SkBitmap& device, const SkPaint& paint)
: INHERITED(device) {
fSrcA = paint.getAlpha();
}
const SkBitmap* SkA8_Blitter::justAnOpaqueColor(uint32_t* value) {
if (255 == fSrcA) {
*value = 255;
return &fDevice;
}
return NULL;
}
void SkA8_Blitter::blitH(int x, int y, int width) {
SkASSERT(x >= 0 && y >= 0 &&
(unsigned)(x + width) <= (unsigned)fDevice.width());
if (fSrcA == 0) {
return;
}
uint8_t* device = fDevice.getAddr8(x, y);
if (fSrcA == 255) {
memset(device, 0xFF, width);
} else {
unsigned scale = 256 - SkAlpha255To256(fSrcA);
unsigned srcA = fSrcA;
for (int i = 0; i < width; i++) {
device[i] = SkToU8(srcA + SkAlphaMul(device[i], scale));
}
}
}
void SkA8_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
const int16_t runs[]) {
if (fSrcA == 0) {
return;
}
uint8_t* device = fDevice.getAddr8(x, y);
unsigned srcA = fSrcA;
for (;;) {
int count = runs[0];
SkASSERT(count >= 0);
if (count == 0) {
return;
}
unsigned aa = antialias[0];
if (aa == 255 && srcA == 255) {
memset(device, 0xFF, count);
} else {
unsigned sa = SkAlphaMul(srcA, SkAlpha255To256(aa));
unsigned scale = 256 - sa;
for (int i = 0; i < count; i++) {
device[i] = SkToU8(sa + SkAlphaMul(device[i], scale));
}
}
runs += count;
antialias += count;
device += count;
}
}
/////////////////////////////////////////////////////////////////////////////////////
#define solid_8_pixels(mask, dst) \
do { \
if (mask & 0x80) dst[0] = 0xFF; \
if (mask & 0x40) dst[1] = 0xFF; \
if (mask & 0x20) dst[2] = 0xFF; \
if (mask & 0x10) dst[3] = 0xFF; \
if (mask & 0x08) dst[4] = 0xFF; \
if (mask & 0x04) dst[5] = 0xFF; \
if (mask & 0x02) dst[6] = 0xFF; \
if (mask & 0x01) dst[7] = 0xFF; \
} while (0)
#define SK_BLITBWMASK_NAME SkA8_BlitBW
#define SK_BLITBWMASK_ARGS
#define SK_BLITBWMASK_BLIT8(mask, dst) solid_8_pixels(mask, dst)
#define SK_BLITBWMASK_GETADDR getAddr8
#define SK_BLITBWMASK_DEVTYPE uint8_t
#include "SkBlitBWMaskTemplate.h"
static inline void blend_8_pixels(U8CPU bw, uint8_t dst[], U8CPU sa,
unsigned dst_scale) {
if (bw & 0x80) dst[0] = SkToU8(sa + SkAlphaMul(dst[0], dst_scale));
if (bw & 0x40) dst[1] = SkToU8(sa + SkAlphaMul(dst[1], dst_scale));
if (bw & 0x20) dst[2] = SkToU8(sa + SkAlphaMul(dst[2], dst_scale));
if (bw & 0x10) dst[3] = SkToU8(sa + SkAlphaMul(dst[3], dst_scale));
if (bw & 0x08) dst[4] = SkToU8(sa + SkAlphaMul(dst[4], dst_scale));
if (bw & 0x04) dst[5] = SkToU8(sa + SkAlphaMul(dst[5], dst_scale));
if (bw & 0x02) dst[6] = SkToU8(sa + SkAlphaMul(dst[6], dst_scale));
if (bw & 0x01) dst[7] = SkToU8(sa + SkAlphaMul(dst[7], dst_scale));
}
#define SK_BLITBWMASK_NAME SkA8_BlendBW
#define SK_BLITBWMASK_ARGS , U8CPU sa, unsigned dst_scale
#define SK_BLITBWMASK_BLIT8(mask, dst) blend_8_pixels(mask, dst, sa, dst_scale)
#define SK_BLITBWMASK_GETADDR getAddr8
#define SK_BLITBWMASK_DEVTYPE uint8_t
#include "SkBlitBWMaskTemplate.h"
void SkA8_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
if (fSrcA == 0) {
return;
}
if (mask.fFormat == SkMask::kBW_Format) {
if (fSrcA == 0xFF) {
SkA8_BlitBW(fDevice, mask, clip);
} else {
SkA8_BlendBW(fDevice, mask, clip, fSrcA,
SkAlpha255To256(255 - fSrcA));
}
return;
}
int x = clip.fLeft;
int y = clip.fTop;
int width = clip.width();
int height = clip.height();
uint8_t* device = fDevice.getAddr8(x, y);
const uint8_t* alpha = mask.getAddr8(x, y);
unsigned srcA = fSrcA;
while (--height >= 0) {
for (int i = width - 1; i >= 0; --i) {
unsigned sa;
// scale our src by the alpha value
{
int aa = alpha[i];
if (aa == 0) {
continue;
}
if (aa == 255) {
if (srcA == 255) {
device[i] = 0xFF;
continue;
}
sa = srcA;
} else {
sa = SkAlphaMul(srcA, SkAlpha255To256(aa));
}
}
int scale = 256 - SkAlpha255To256(sa);
device[i] = SkToU8(sa + SkAlphaMul(device[i], scale));
}
device += fDevice.rowBytes();
alpha += mask.fRowBytes;
}
}
///////////////////////////////////////////////////////////////////////////////
void SkA8_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
if (fSrcA == 0) {
return;
}
unsigned sa = SkAlphaMul(fSrcA, SkAlpha255To256(alpha));
uint8_t* device = fDevice.getAddr8(x, y);
size_t rowBytes = fDevice.rowBytes();
if (sa == 0xFF) {
for (int i = 0; i < height; i++) {
*device = SkToU8(sa);
device += rowBytes;
}
} else {
unsigned scale = 256 - SkAlpha255To256(sa);
for (int i = 0; i < height; i++) {
*device = SkToU8(sa + SkAlphaMul(*device, scale));
device += rowBytes;
}
}
}
void SkA8_Blitter::blitRect(int x, int y, int width, int height) {
SkASSERT(x >= 0 && y >= 0 &&
(unsigned)(x + width) <= (unsigned)fDevice.width() &&
(unsigned)(y + height) <= (unsigned)fDevice.height());
if (fSrcA == 0) {
return;
}
uint8_t* device = fDevice.getAddr8(x, y);
unsigned srcA = fSrcA;
if (srcA == 255) {
while (--height >= 0) {
memset(device, 0xFF, width);
device += fDevice.rowBytes();
}
} else {
unsigned scale = 256 - SkAlpha255To256(srcA);
while (--height >= 0) {
for (int i = 0; i < width; i++) {
device[i] = SkToU8(srcA + SkAlphaMul(device[i], scale));
}
device += fDevice.rowBytes();
}
}
}
///////////////////////////////////////////////////////////////////////
SkA8_Shader_Blitter::SkA8_Shader_Blitter(const SkBitmap& device, const SkPaint& paint)
: INHERITED(device, paint) {
if ((fXfermode = paint.getXfermode()) != NULL) {
fXfermode->ref();
SkASSERT(fShader);
}
int width = device.width();
fBuffer = (SkPMColor*)sk_malloc_throw(sizeof(SkPMColor) * (width + (SkAlign4(width) >> 2)));
fAAExpand = (uint8_t*)(fBuffer + width);
}
SkA8_Shader_Blitter::~SkA8_Shader_Blitter() {
if (fXfermode) SkSafeUnref(fXfermode);
sk_free(fBuffer);
}
void SkA8_Shader_Blitter::blitH(int x, int y, int width) {
SkASSERT(x >= 0 && y >= 0 &&
(unsigned)(x + width) <= (unsigned)fDevice.width());
uint8_t* device = fDevice.getAddr8(x, y);
if ((fShader->getFlags() & SkShader::kOpaqueAlpha_Flag) && !fXfermode) {
memset(device, 0xFF, width);
} else {
SkPMColor* span = fBuffer;
fShader->shadeSpan(x, y, span, width);
if (fXfermode) {
fXfermode->xferA8(device, span, width, NULL);
} else {
for (int i = width - 1; i >= 0; --i) {
unsigned srcA = SkGetPackedA32(span[i]);
unsigned scale = 256 - SkAlpha255To256(srcA);
device[i] = SkToU8(srcA + SkAlphaMul(device[i], scale));
}
}
}
}
static inline uint8_t aa_blend8(SkPMColor src, U8CPU da, int aa) {
SkASSERT((unsigned)aa <= 255);
int src_scale = SkAlpha255To256(aa);
int sa = SkGetPackedA32(src);
int dst_scale = 256 - SkAlphaMul(sa, src_scale);
return SkToU8((sa * src_scale + da * dst_scale) >> 8);
}
void SkA8_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
const int16_t runs[]) {
SkShader* shader = fShader;
SkXfermode* mode = fXfermode;
uint8_t* aaExpand = fAAExpand;
SkPMColor* span = fBuffer;
uint8_t* device = fDevice.getAddr8(x, y);
int opaque = fShader->getFlags() & SkShader::kOpaqueAlpha_Flag;
for (;;) {
int count = *runs;
if (count == 0) {
break;
}
int aa = *antialias;
if (aa) {
if (opaque && aa == 255 && mode == NULL) {
memset(device, 0xFF, count);
} else {
shader->shadeSpan(x, y, span, count);
if (mode) {
memset(aaExpand, aa, count);
mode->xferA8(device, span, count, aaExpand);
} else {
for (int i = count - 1; i >= 0; --i) {
device[i] = aa_blend8(span[i], device[i], aa);
}
}
}
}
device += count;
runs += count;
antialias += count;
x += count;
}
}
void SkA8_Shader_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
if (mask.fFormat == SkMask::kBW_Format) {
this->INHERITED::blitMask(mask, clip);
return;
}
int x = clip.fLeft;
int y = clip.fTop;
int width = clip.width();
int height = clip.height();
uint8_t* device = fDevice.getAddr8(x, y);
const uint8_t* alpha = mask.getAddr8(x, y);
SkPMColor* span = fBuffer;
while (--height >= 0) {
fShader->shadeSpan(x, y, span, width);
if (fXfermode) {
fXfermode->xferA8(device, span, width, alpha);
} else {
for (int i = width - 1; i >= 0; --i) {
device[i] = aa_blend8(span[i], device[i], alpha[i]);
}
}
y += 1;
device += fDevice.rowBytes();
alpha += mask.fRowBytes;
}
}
///////////////////////////////////////////////////////////////////////////////
SkA8_Coverage_Blitter::SkA8_Coverage_Blitter(const SkBitmap& device,
const SkPaint& paint) : SkRasterBlitter(device) {
SkASSERT(NULL == paint.getShader());
SkASSERT(NULL == paint.getXfermode());
SkASSERT(NULL == paint.getColorFilter());
}
void SkA8_Coverage_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
const int16_t runs[]) {
uint8_t* device = fDevice.getAddr8(x, y);
SkDEBUGCODE(int totalCount = 0;)
for (;;) {
int count = runs[0];
SkASSERT(count >= 0);
if (count == 0) {
return;
}
if (antialias[0]) {
memset(device, antialias[0], count);
}
runs += count;
antialias += count;
device += count;
SkDEBUGCODE(totalCount += count;)
}
SkASSERT(fDevice.width() == totalCount);
}
void SkA8_Coverage_Blitter::blitH(int x, int y, int width) {
memset(fDevice.getAddr8(x, y), 0xFF, width);
}
void SkA8_Coverage_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
if (0 == alpha) {
return;
}
uint8_t* dst = fDevice.getAddr8(x, y);
const size_t dstRB = fDevice.rowBytes();
while (--height >= 0) {
*dst = alpha;
dst += dstRB;
}
}
void SkA8_Coverage_Blitter::blitRect(int x, int y, int width, int height) {
uint8_t* dst = fDevice.getAddr8(x, y);
const size_t dstRB = fDevice.rowBytes();
while (--height >= 0) {
memset(dst, 0xFF, width);
dst += dstRB;
}
}
void SkA8_Coverage_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
SkASSERT(SkMask::kA8_Format == mask.fFormat);
int x = clip.fLeft;
int y = clip.fTop;
int width = clip.width();
int height = clip.height();
uint8_t* dst = fDevice.getAddr8(x, y);
const uint8_t* src = mask.getAddr8(x, y);
const size_t srcRB = mask.fRowBytes;
const size_t dstRB = fDevice.rowBytes();
while (--height >= 0) {
memcpy(dst, src, width);
dst += dstRB;
src += srcRB;
}
}
const SkBitmap* SkA8_Coverage_Blitter::justAnOpaqueColor(uint32_t*) {
return NULL;
}