The Tor Browser: gfx/skia/trunk/src/core/SkBlitter

gfx/skia/trunk/src/core/SkBlitter_A8.cpp@deefc01c0e14 (annotated)

gfx/skia/trunk/src/core/SkBlitter_A8.cpp

Thu, 15 Jan 2015 21:03:48 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 21:03:48 +0100
branch: TOR_BUG_9701
changeset 11: deefc01c0e14
permissions: -rw-r--r--

Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)

 /*
  * 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;
 }

The Tor Browser / annotate

gfx/skia/trunk/src/core/SkBlitter_A8.cpp@deefc01c0e14 (annotated)

gfx/skia/trunk/src/core/SkBlitter_A8.cpp