| |
| /* |
| * 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 "SkDither.h" |
| #include "SkShader.h" |
| #include "SkTemplatesPriv.h" |
| #include "SkUtils.h" |
| #include "SkXfermode.h" |
| |
| static inline SkPMColor SkBlendARGB4444(SkPMColor16 src, SkPMColor16 dst, |
| U8CPU aa) { |
| SkASSERT((unsigned)aa <= 255); |
| |
| unsigned src_scale = SkAlpha255To256(aa) >> 4; |
| unsigned dst_scale = SkAlpha15To16(15 - SkAlphaMul4(SkGetPackedA4444(src), src_scale)); |
| |
| uint32_t src32 = SkExpand_4444(src) * src_scale; |
| uint32_t dst32 = SkExpand_4444(dst) * dst_scale; |
| return SkCompact_4444((src32 + dst32) >> 4); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class SkARGB4444_Blitter : public SkRasterBlitter { |
| public: |
| SkARGB4444_Blitter(const SkBitmap& device, const SkPaint& paint); |
| virtual void blitH(int x, int y, int width); |
| virtual void blitAntiH(int x, int y, const SkAlpha antialias[], |
| const int16_t runs[]); |
| virtual void blitV(int x, int y, int height, SkAlpha alpha); |
| virtual void blitRect(int x, int y, int width, int height); |
| virtual void blitMask(const SkMask&, const SkIRect&); |
| virtual const SkBitmap* justAnOpaqueColor(uint32_t*); |
| |
| protected: |
| SkPMColor16 fPMColor16, fPMColor16Other; |
| SkPMColor16 fRawColor16, fRawColor16Other; |
| uint8_t fScale16; |
| |
| private: |
| // illegal |
| SkARGB4444_Blitter& operator=(const SkARGB4444_Blitter&); |
| |
| typedef SkRasterBlitter INHERITED; |
| }; |
| |
| |
| SkARGB4444_Blitter::SkARGB4444_Blitter(const SkBitmap& device, |
| const SkPaint& paint) : INHERITED(device) { |
| // cache premultiplied versions in 4444 |
| SkPMColor c = SkPreMultiplyColor(paint.getColor()); |
| fPMColor16 = SkPixel32ToPixel4444(c); |
| if (paint.isDither()) { |
| fPMColor16Other = SkDitherPixel32To4444(c); |
| } else { |
| fPMColor16Other = fPMColor16; |
| } |
| |
| // cache raw versions in 4444 |
| fRawColor16 = SkPackARGB4444(0xFF >> 4, SkColorGetR(c) >> 4, |
| SkColorGetG(c) >> 4, SkColorGetB(c) >> 4); |
| if (paint.isDither()) { |
| fRawColor16Other = SkDitherARGB32To4444(0xFF, SkColorGetR(c), |
| SkColorGetG(c), SkColorGetB(c)); |
| } else { |
| fRawColor16Other = fRawColor16; |
| } |
| |
| fScale16 = SkAlpha15To16(SkGetPackedA4444(fPMColor16Other)); |
| if (16 == fScale16) { |
| // force the original to also be opaque |
| fPMColor16 |= (0xF << SK_A4444_SHIFT); |
| } |
| } |
| |
| const SkBitmap* SkARGB4444_Blitter::justAnOpaqueColor(uint32_t* value) { |
| if (16 == fScale16) { |
| *value = fPMColor16; |
| return &fDevice; |
| } |
| return NULL; |
| } |
| |
| static void src_over_4444(SkPMColor16 dst[], SkPMColor16 color, |
| SkPMColor16 other, unsigned invScale, int count) { |
| int twice = count >> 1; |
| while (--twice >= 0) { |
| *dst = color + SkAlphaMulQ4(*dst, invScale); |
| dst++; |
| *dst = other + SkAlphaMulQ4(*dst, invScale); |
| dst++; |
| } |
| if (count & 1) { |
| *dst = color + SkAlphaMulQ4(*dst, invScale); |
| } |
| } |
| |
| static inline uint32_t SkExpand_4444_Replicate(SkPMColor16 c) { |
| uint32_t c32 = SkExpand_4444(c); |
| return c32 | (c32 << 4); |
| } |
| |
| static void src_over_4444x(SkPMColor16 dst[], uint32_t color, |
| uint32_t other, unsigned invScale, int count) { |
| int twice = count >> 1; |
| uint32_t tmp; |
| while (--twice >= 0) { |
| tmp = SkExpand_4444(*dst) * invScale; |
| *dst++ = SkCompact_4444((color + tmp) >> 4); |
| tmp = SkExpand_4444(*dst) * invScale; |
| *dst++ = SkCompact_4444((other + tmp) >> 4); |
| } |
| if (count & 1) { |
| tmp = SkExpand_4444(*dst) * invScale; |
| *dst = SkCompact_4444((color + tmp) >> 4); |
| } |
| } |
| |
| void SkARGB4444_Blitter::blitH(int x, int y, int width) { |
| SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width()); |
| |
| if (0 == fScale16) { |
| return; |
| } |
| |
| SkPMColor16* device = fDevice.getAddr16(x, y); |
| SkPMColor16 color = fPMColor16; |
| SkPMColor16 other = fPMColor16Other; |
| |
| if ((x ^ y) & 1) { |
| SkTSwap<SkPMColor16>(color, other); |
| } |
| |
| if (16 == fScale16) { |
| sk_dither_memset16(device, color, other, width); |
| } else { |
| src_over_4444x(device, SkExpand_4444_Replicate(color), |
| SkExpand_4444_Replicate(other), |
| 16 - fScale16, width); |
| } |
| } |
| |
| void SkARGB4444_Blitter::blitV(int x, int y, int height, SkAlpha alpha) { |
| if (0 == alpha || 0 == fScale16) { |
| return; |
| } |
| |
| SkPMColor16* device = fDevice.getAddr16(x, y); |
| SkPMColor16 color = fPMColor16; |
| SkPMColor16 other = fPMColor16Other; |
| unsigned rb = fDevice.rowBytes(); |
| |
| if ((x ^ y) & 1) { |
| SkTSwap<SkPMColor16>(color, other); |
| } |
| |
| if (16 == fScale16 && 255 == alpha) { |
| while (--height >= 0) { |
| *device = color; |
| device = (SkPMColor16*)((char*)device + rb); |
| SkTSwap<SkPMColor16>(color, other); |
| } |
| } else { |
| unsigned alphaScale = SkAlpha255To256(alpha); |
| uint32_t c32 = SkExpand_4444(color) * (alphaScale >> 4); |
| // need to normalize the low nibble of each expanded component |
| // so we don't overflow the add with d32 |
| c32 = SkCompact_4444(c32 >> 4); |
| unsigned invScale = 16 - SkAlpha15To16(SkGetPackedA4444(c32)); |
| // now re-expand and replicate |
| c32 = SkExpand_4444_Replicate(c32); |
| |
| while (--height >= 0) { |
| uint32_t d32 = SkExpand_4444(*device) * invScale; |
| *device = SkCompact_4444((c32 + d32) >> 4); |
| device = (SkPMColor16*)((char*)device + rb); |
| } |
| } |
| } |
| |
| void SkARGB4444_Blitter::blitRect(int x, int y, int width, int height) { |
| SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width() && |
| y + height <= fDevice.height()); |
| |
| if (0 == fScale16) { |
| return; |
| } |
| |
| SkPMColor16* device = fDevice.getAddr16(x, y); |
| SkPMColor16 color = fPMColor16; |
| SkPMColor16 other = fPMColor16Other; |
| |
| if ((x ^ y) & 1) { |
| SkTSwap<SkPMColor16>(color, other); |
| } |
| |
| if (16 == fScale16) { |
| while (--height >= 0) { |
| sk_dither_memset16(device, color, other, width); |
| device = (SkPMColor16*)((char*)device + fDevice.rowBytes()); |
| SkTSwap<SkPMColor16>(color, other); |
| } |
| } else { |
| unsigned invScale = 16 - fScale16; |
| |
| uint32_t c32 = SkExpand_4444_Replicate(color); |
| uint32_t o32 = SkExpand_4444_Replicate(other); |
| while (--height >= 0) { |
| src_over_4444x(device, c32, o32, invScale, width); |
| device = (SkPMColor16*)((char*)device + fDevice.rowBytes()); |
| SkTSwap<uint32_t>(c32, o32); |
| } |
| } |
| } |
| |
| void SkARGB4444_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[], |
| const int16_t runs[]) { |
| if (0 == fScale16) { |
| return; |
| } |
| |
| SkPMColor16* device = fDevice.getAddr16(x, y); |
| SkPMColor16 color = fPMColor16; |
| SkPMColor16 other = fPMColor16Other; |
| |
| if ((x ^ y) & 1) { |
| SkTSwap<SkPMColor16>(color, other); |
| } |
| |
| for (;;) { |
| int count = runs[0]; |
| SkASSERT(count >= 0); |
| if (count <= 0) { |
| return; |
| } |
| |
| unsigned aa = antialias[0]; |
| if (aa) { |
| if (0xFF == aa) { |
| if (16 == fScale16) { |
| sk_dither_memset16(device, color, other, count); |
| } else { |
| src_over_4444(device, color, other, 16 - fScale16, count); |
| } |
| } else { |
| // todo: respect dithering |
| aa = SkAlpha255To256(aa); // FIX |
| SkPMColor16 src = SkAlphaMulQ4(color, aa >> 4); |
| unsigned dst_scale = SkAlpha15To16(15 - SkGetPackedA4444(src)); // FIX |
| int n = count; |
| do { |
| --n; |
| device[n] = src + SkAlphaMulQ4(device[n], dst_scale); |
| } while (n > 0); |
| } |
| } |
| |
| runs += count; |
| antialias += count; |
| device += count; |
| |
| if (count & 1) { |
| SkTSwap<SkPMColor16>(color, other); |
| } |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #define solid_8_pixels(mask, dst, color) \ |
| do { \ |
| if (mask & 0x80) dst[0] = color; \ |
| if (mask & 0x40) dst[1] = color; \ |
| if (mask & 0x20) dst[2] = color; \ |
| if (mask & 0x10) dst[3] = color; \ |
| if (mask & 0x08) dst[4] = color; \ |
| if (mask & 0x04) dst[5] = color; \ |
| if (mask & 0x02) dst[6] = color; \ |
| if (mask & 0x01) dst[7] = color; \ |
| } while (0) |
| |
| #define SK_BLITBWMASK_NAME SkARGB4444_BlitBW |
| #define SK_BLITBWMASK_ARGS , SkPMColor16 color |
| #define SK_BLITBWMASK_BLIT8(mask, dst) solid_8_pixels(mask, dst, color) |
| #define SK_BLITBWMASK_GETADDR getAddr16 |
| #define SK_BLITBWMASK_DEVTYPE uint16_t |
| #include "SkBlitBWMaskTemplate.h" |
| |
| #define blend_8_pixels(mask, dst, sc, dst_scale) \ |
| do { \ |
| if (mask & 0x80) { dst[0] = sc + SkAlphaMulQ4(dst[0], dst_scale); } \ |
| if (mask & 0x40) { dst[1] = sc + SkAlphaMulQ4(dst[1], dst_scale); } \ |
| if (mask & 0x20) { dst[2] = sc + SkAlphaMulQ4(dst[2], dst_scale); } \ |
| if (mask & 0x10) { dst[3] = sc + SkAlphaMulQ4(dst[3], dst_scale); } \ |
| if (mask & 0x08) { dst[4] = sc + SkAlphaMulQ4(dst[4], dst_scale); } \ |
| if (mask & 0x04) { dst[5] = sc + SkAlphaMulQ4(dst[5], dst_scale); } \ |
| if (mask & 0x02) { dst[6] = sc + SkAlphaMulQ4(dst[6], dst_scale); } \ |
| if (mask & 0x01) { dst[7] = sc + SkAlphaMulQ4(dst[7], dst_scale); } \ |
| } while (0) |
| |
| #define SK_BLITBWMASK_NAME SkARGB4444_BlendBW |
| #define SK_BLITBWMASK_ARGS , uint16_t sc, unsigned dst_scale |
| #define SK_BLITBWMASK_BLIT8(mask, dst) blend_8_pixels(mask, dst, sc, dst_scale) |
| #define SK_BLITBWMASK_GETADDR getAddr16 |
| #define SK_BLITBWMASK_DEVTYPE uint16_t |
| #include "SkBlitBWMaskTemplate.h" |
| |
| void SkARGB4444_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) { |
| SkASSERT(mask.fBounds.contains(clip)); |
| |
| if (0 == fScale16) { |
| return; |
| } |
| |
| if (mask.fFormat == SkMask::kBW_Format) { |
| if (16 == fScale16) { |
| SkARGB4444_BlitBW(fDevice, mask, clip, fPMColor16); |
| } else { |
| SkARGB4444_BlendBW(fDevice, mask, clip, fPMColor16, 16 - fScale16); |
| } |
| return; |
| } |
| |
| int x = clip.fLeft; |
| int y = clip.fTop; |
| int width = clip.width(); |
| int height = clip.height(); |
| |
| SkPMColor16* device = fDevice.getAddr16(x, y); |
| const uint8_t* alpha = mask.getAddr8(x, y); |
| SkPMColor16 srcColor = fPMColor16; |
| unsigned devRB = fDevice.rowBytes() - (width << 1); |
| unsigned maskRB = mask.fRowBytes - width; |
| |
| do { |
| int w = width; |
| do { |
| unsigned aa = *alpha++; |
| *device = SkBlendARGB4444(srcColor, *device, aa); |
| device += 1; |
| } while (--w != 0); |
| device = (SkPMColor16*)((char*)device + devRB); |
| alpha += maskRB; |
| } while (--height != 0); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class SkARGB4444_Shader_Blitter : public SkShaderBlitter { |
| SkXfermode* fXfermode; |
| SkBlitRow::Proc fOpaqueProc; |
| SkBlitRow::Proc fAlphaProc; |
| SkPMColor* fBuffer; |
| uint8_t* fAAExpand; |
| public: |
| |
| SkARGB4444_Shader_Blitter(const SkBitmap& device, const SkPaint& paint) |
| : INHERITED(device, paint) { |
| const int width = device.width(); |
| fBuffer = (SkPMColor*)sk_malloc_throw(width * sizeof(SkPMColor) + width); |
| fAAExpand = (uint8_t*)(fBuffer + width); |
| |
| fXfermode = paint.getXfermode(); |
| SkSafeRef(fXfermode); |
| |
| unsigned flags = 0; |
| if (!(fShader->getFlags() & SkShader::kOpaqueAlpha_Flag)) { |
| flags |= SkBlitRow::kSrcPixelAlpha_Flag; |
| } |
| if (paint.isDither()) { |
| flags |= SkBlitRow::kDither_Flag; |
| } |
| fOpaqueProc = SkBlitRow::Factory(flags, SkBitmap::kARGB_4444_Config); |
| fAlphaProc = SkBlitRow::Factory(flags | SkBlitRow::kGlobalAlpha_Flag, |
| SkBitmap::kARGB_4444_Config); |
| } |
| |
| virtual ~SkARGB4444_Shader_Blitter() { |
| SkSafeUnref(fXfermode); |
| sk_free(fBuffer); |
| } |
| |
| virtual void blitH(int x, int y, int width) { |
| SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width()); |
| |
| SkPMColor16* device = fDevice.getAddr16(x, y); |
| SkPMColor* span = fBuffer; |
| |
| fShader->shadeSpan(x, y, span, width); |
| if (fXfermode) { |
| fXfermode->xfer4444(device, span, width, NULL); |
| } else { |
| fOpaqueProc(device, span, width, 0xFF, x, y); |
| } |
| } |
| |
| virtual void blitAntiH(int x, int y, const SkAlpha antialias[], |
| const int16_t runs[]) { |
| SkPMColor* SK_RESTRICT span = fBuffer; |
| uint8_t* SK_RESTRICT aaExpand = fAAExpand; |
| SkPMColor16* device = fDevice.getAddr16(x, y); |
| SkShader* shader = fShader; |
| SkXfermode* xfer = fXfermode; |
| |
| if (NULL != xfer) { |
| for (;;) { |
| int count = *runs; |
| if (count <= 0) { |
| break; |
| } |
| int aa = *antialias; |
| if (aa) { |
| shader->shadeSpan(x, y, span, count); |
| if (255 == aa) { |
| xfer->xfer4444(device, span, count, NULL); |
| } else { |
| const uint8_t* aaBuffer = antialias; |
| if (count > 1) { |
| memset(aaExpand, aa, count); |
| aaBuffer = aaExpand; |
| } |
| xfer->xfer4444(device, span, count, aaBuffer); |
| } |
| } |
| device += count; |
| runs += count; |
| antialias += count; |
| x += count; |
| } |
| } else { // no xfermode |
| for (;;) { |
| int count = *runs; |
| if (count <= 0) { |
| break; |
| } |
| int aa = *antialias; |
| if (aa) { |
| fShader->shadeSpan(x, y, span, count); |
| if (255 == aa) { |
| fOpaqueProc(device, span, count, aa, x, y); |
| } else { |
| fAlphaProc(device, span, count, aa, x, y); |
| } |
| } |
| device += count; |
| runs += count; |
| antialias += count; |
| x += count; |
| } |
| } |
| } |
| |
| private: |
| typedef SkShaderBlitter INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkBlitter* SkBlitter_ChooseD4444(const SkBitmap& device, |
| const SkPaint& paint, |
| void* storage, size_t storageSize) |
| { |
| SkBlitter* blitter; |
| |
| if (paint.getShader()) { |
| SK_PLACEMENT_NEW_ARGS(blitter, SkARGB4444_Shader_Blitter, storage, storageSize, (device, paint)); |
| } else { |
| SK_PLACEMENT_NEW_ARGS(blitter, SkARGB4444_Blitter, storage, storageSize, (device, paint)); |
| } |
| return blitter; |
| } |
| |
