예제 #1
0
void SkARGB32_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
    if (alpha == 0 || fSrcA == 0) {
        return;
    }

    uint32_t* device = fDevice.getAddr32(x, y);
    uint32_t  color = fPMColor;

    if (alpha != 255) {
        color = SkAlphaMulQ(color, SkAlpha255To256(alpha));
    }

    unsigned dst_scale = 255 - SkGetPackedA32(color);
    uint32_t prevDst = ~device[0];
    uint32_t result  SK_INIT_TO_AVOID_WARNING;
    uint32_t rowBytes = fDevice.rowBytes();

    while (--height >= 0) {
        uint32_t dst = device[0];
        if (dst != prevDst) {
            result = color + SkAlphaMulQ(dst, dst_scale);
            prevDst = dst;
        }
        device[0] = result;
        device = (uint32_t*)((char*)device + rowBytes);
    }
}
예제 #2
0
void SkARGB32_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
                                 const int16_t runs[]) {
    if (fSrcA == 0) {
        return;
    }

    uint32_t    color = fPMColor;
    uint32_t*   device = fDevice.getAddr32(x, y);
    unsigned    opaqueMask = fSrcA; // if fSrcA is 0xFF, then we will catch the fast opaque case

    for (;;) {
        int count = runs[0];
        SkASSERT(count >= 0);
        if (count <= 0) {
            return;
        }
        unsigned aa = antialias[0];
        if (aa) {
            if ((opaqueMask & aa) == 255) {
                sk_memset32(device, color, count);
            } else {
                uint32_t sc = SkAlphaMulQ(color, aa);
                unsigned dst_scale = 255 - SkGetPackedA32(sc);
                int n = count;
                do {
                    --n;
                    device[n] = sc + SkAlphaMulQ(device[n], dst_scale);
                } while (n > 0);
            }
        }
        runs += count;
        antialias += count;
        device += count;
    }
}
예제 #3
0
void SkARGB32_Opaque_Blitter::blitMask(const SkMask& mask,
                                       const SkIRect& clip) {
    SkASSERT(mask.fBounds.contains(clip));

    if (mask.fFormat == SkMask::kBW_Format) {
        SkARGB32_BlitBW(fDevice, mask, clip, fPMColor);
        return;
    }

    int x = clip.fLeft;
    int y = clip.fTop;
    int width = clip.width();
    int height = clip.height();

    uint32_t*       device = fDevice.getAddr32(x, y);
    const uint8_t*  alpha = mask.getAddr(x, y);
    uint32_t        srcColor = fPMColor;
    unsigned        devRB = fDevice.rowBytes() - (width << 2);
    unsigned        maskRB = mask.fRowBytes - width;

    do {
        int w = width;
        do {
            unsigned aa = *alpha++;
            *device = SkAlphaMulQ(srcColor, SkAlpha255To256(aa)) + SkAlphaMulQ(*device, SkAlpha255To256(255 - aa));
            device += 1;
        } while (--w != 0);
        device = (uint32_t*)((char*)device + devRB);
        alpha += maskRB;
    } while (--height != 0);
}
예제 #4
0
void SkComposeShader::ComposeShaderContext::shadeSpan(int x, int y, SkPMColor result[], int count) {
    SkShader::Context* shaderContextA = fShaderContextA;
    SkShader::Context* shaderContextB = fShaderContextB;
    SkBlendMode        mode = static_cast<const SkComposeShader&>(fShader).fMode;
    unsigned           scale = SkAlpha255To256(this->getPaintAlpha());

    SkPMColor   tmp[TMP_COLOR_COUNT];

    SkXfermode* xfer = SkXfermode::Peek(mode);
    if (nullptr == xfer) {   // implied SRC_OVER
        // TODO: when we have a good test-case, should use SkBlitRow::Proc32
        // for these loops
        do {
            int n = count;
            if (n > TMP_COLOR_COUNT) {
                n = TMP_COLOR_COUNT;
            }

            shaderContextA->shadeSpan(x, y, result, n);
            shaderContextB->shadeSpan(x, y, tmp, n);

            if (256 == scale) {
                for (int i = 0; i < n; i++) {
                    result[i] = SkPMSrcOver(tmp[i], result[i]);
                }
            } else {
                for (int i = 0; i < n; i++) {
                    result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]),
                                            scale);
                }
            }

            result += n;
            x += n;
            count -= n;
        } while (count > 0);
    } else {    // use mode for the composition
        do {
            int n = count;
            if (n > TMP_COLOR_COUNT) {
                n = TMP_COLOR_COUNT;
            }

            shaderContextA->shadeSpan(x, y, result, n);
            shaderContextB->shadeSpan(x, y, tmp, n);
            xfer->xfer32(result, tmp, n, nullptr);

            if (256 != scale) {
                for (int i = 0; i < n; i++) {
                    result[i] = SkAlphaMulQ(result[i], scale);
                }
            }

            result += n;
            x += n;
            count -= n;
        } while (count > 0);
    }
}
예제 #5
0
void SkComposeShader::shadeSpan(int x, int y, SkPMColor result[], int count) {
    SkShader*   shaderA = fShaderA;
    SkShader*   shaderB = fShaderB;
    SkXfermode* mode = fMode;
    unsigned    scale = SkAlpha255To256(this->getPaintAlpha());

    SkPMColor   tmp[TMP_COLOR_COUNT];

    if (NULL == mode) {   // implied SRC_OVER
        // TODO: when we have a good test-case, should use SkBlitRow::Proc32
        // for these loops
        do {
            int n = count;
            if (n > TMP_COLOR_COUNT) {
                n = TMP_COLOR_COUNT;
            }

            shaderA->shadeSpan(x, y, result, n);
            shaderB->shadeSpan(x, y, tmp, n);

            if (256 == scale) {
                for (int i = 0; i < n; i++) {
                    result[i] = SkPMSrcOver(tmp[i], result[i]);
                }
            } else {
                for (int i = 0; i < n; i++) {
                    result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]),
                                            scale);
                }
            }

            result += n;
            x += n;
            count -= n;
        } while (count > 0);
    } else {    // use mode for the composition
        do {
            int n = count;
            if (n > TMP_COLOR_COUNT) {
                n = TMP_COLOR_COUNT;
            }

            shaderA->shadeSpan(x, y, result, n);
            shaderB->shadeSpan(x, y, tmp, n);
            mode->xfer32(result, tmp, n, NULL);

            if (256 == scale) {
                for (int i = 0; i < n; i++) {
                    result[i] = SkAlphaMulQ(result[i], scale);
                }
            }

            result += n;
            x += n;
            count -= n;
        } while (count > 0);
    }
}
예제 #6
0
//  kSrcOver_Mode,  //!< [Sa + Da - Sa*Da, Sc + (1 - Sa)*Dc] 
static SkPMColor srcover_modeproc(SkPMColor src, SkPMColor dst) {
#if 0
    // this is the old, more-correct way, but it doesn't guarantee that dst==255
    // will always stay opaque
    return src + SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src)));
#else
    // this is slightly faster, but more importantly guarantees that dst==255
    // will always stay opaque
    return src + SkAlphaMulQ(dst, 256 - SkGetPackedA32(src));
#endif
}
예제 #7
0
void TransparencyWin::compositeTextComposite()
{
    if (!m_validLayer)
        return;

    const SkBitmap& bitmap = m_layerBuffer->context()->layerBitmap(GraphicsContext::ReadWrite);
    SkColor textColor = m_textCompositeColor.rgb();
    for (int y = 0; y < m_layerSize.height(); y++) {
        uint32_t* row = bitmap.getAddr32(0, y);
        for (int x = 0; x < m_layerSize.width(); x++) {
            // The alpha is the average of the R, G, and B channels.
            int alpha = (SkGetPackedR32(row[x]) + SkGetPackedG32(row[x]) + SkGetPackedB32(row[x])) / 3;

            // Apply that alpha to the text color and write the result.
            row[x] = SkAlphaMulQ(textColor, SkAlpha255To256(255 - alpha));
        }
    }

    // Now the layer has text with the proper color and opacity.
    m_destContext->save();

    // We want to use Untransformed space (see above)
    SkMatrix identity;
    identity.reset();
    m_destContext->setMatrix(identity);
    SkRect destRect = { m_transformedSourceRect.x(), m_transformedSourceRect.y(), m_transformedSourceRect.maxX(), m_transformedSourceRect.maxY() };

    // Note that we need to specify the source layer subset, since the bitmap
    // may have been cached and it could be larger than what we're using.
    SkIRect sourceRect = { 0, 0, m_layerSize.width(), m_layerSize.height() };
    m_destContext->drawBitmapRect(bitmap, &sourceRect, destRect, 0);
    m_destContext->restore();
}
예제 #8
0
void SkARGB32_Black_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
    SkASSERT(mask.fBounds.contains(clip));

    if (mask.fFormat == SkMask::kBW_Format) {
        SkPMColor black = (SkPMColor)(SK_A32_MASK << SK_A32_SHIFT);

        SkARGB32_BlitBW(fDevice, mask, clip, black);
    } else {
        uint32_t*       device = fDevice.getAddr32(clip.fLeft, clip.fTop);
        const uint8_t*  alpha = mask.getAddr(clip.fLeft, clip.fTop);
        unsigned        width = clip.width();
        unsigned        height = clip.height();
        unsigned        deviceRB = fDevice.rowBytes() - (width << 2);
        unsigned        maskRB = mask.fRowBytes - width;

        SkASSERT((int)height > 0);
        SkASSERT((int)width > 0);
        SkASSERT((int)deviceRB >= 0);
        SkASSERT((int)maskRB >= 0);

        do {
            unsigned w = width;
            do {
                unsigned aa = *alpha++;
                *device = (aa << SK_A32_SHIFT) + SkAlphaMulQ(*device, SkAlpha255To256(255 - aa));
                device += 1;
            } while (--w != 0);
            device = (uint32_t*)((char*)device + deviceRB);
            alpha += maskRB;
        } while (--height != 0);
    }
}
예제 #9
0
void SkARGB32_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
                                 const int16_t runs[]) {
    if (fSrcA == 0) {
        return;
    }

    uint32_t    color = fPMColor;
    uint32_t*   device = fDevice.writable_addr32(x, y);
    unsigned    opaqueMask = fSrcA; // if fSrcA is 0xFF, then we will catch the fast opaque case

    for (;;) {
        int count = runs[0];
        SkASSERT(count >= 0);
        if (count <= 0) {
            return;
        }
        unsigned aa = antialias[0];
        if (aa) {
            if ((opaqueMask & aa) == 255) {
                sk_memset32(device, color, count);
            } else {
                uint32_t sc = SkAlphaMulQ(color, SkAlpha255To256(aa));
                SkBlitRow::Color32(device, device, count, sc);
            }
        }
        runs += count;
        antialias += count;
        device += count;
    }
}
예제 #10
0
void SkARGB32_Blitter::blitH(int x, int y, int width) {
    SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width());

    if (fSrcA == 0) {
        return;
    }

    uint32_t* device = fDevice.getAddr32(x, y);

    if (fSrcA == 255) {
        sk_memset32(device, fPMColor, width);
    } else {
        uint32_t color = fPMColor;
        unsigned dst_scale = SkAlpha255To256(255 - fSrcA);
        uint32_t prevDst = ~device[0];  // so we always fail the test the first time
        uint32_t result SK_INIT_TO_AVOID_WARNING;

        for (int i = 0; i < width; i++) {
            uint32_t currDst = device[i];
            if (currDst != prevDst) {
                result = color + SkAlphaMulQ(currDst, dst_scale);
                prevDst = currDst;
            }
            device[i] = result;
        }
    }
}
예제 #11
0
void SkARGB32_Blitter::blitRect(int x, int y, int width, int height) {
    SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width() && y + height <= fDevice.height());

    if (fSrcA == 0) {
        return;
    }

    uint32_t*   device = fDevice.getAddr32(x, y);
    uint32_t    color = fPMColor;

    if (fSrcA == 255) {
        while (--height >= 0) {
            sk_memset32(device, color, width);
            device = (uint32_t*)((char*)device + fDevice.rowBytes());
        }
    } else {
        unsigned dst_scale = SkAlpha255To256(255 - fSrcA);

        while (--height >= 0) {
            uint32_t prevDst = ~device[0];
            uint32_t result SK_INIT_TO_AVOID_WARNING;

            for (int i = 0; i < width; i++) {
                uint32_t dst = device[i];
                if (dst != prevDst) {
                    result = color + SkAlphaMulQ(dst, dst_scale);
                    prevDst = dst;
                }
                device[i] = result;
            }
            device = (uint32_t*)((char*)device + fDevice.rowBytes());
        }
    }
}
예제 #12
0
void SkARGB32_Black_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
                                       const int16_t runs[]) {
    uint32_t*   device = fDevice.getAddr32(x, y);
    SkPMColor   black = (SkPMColor)(SK_A32_MASK << SK_A32_SHIFT);

    for (;;) {
        int count = runs[0];
        SkASSERT(count >= 0);
        if (count <= 0) {
            return;
        }
        unsigned aa = antialias[0];
        if (aa) {
            if (aa == 255) {
                sk_memset32(device, black, count);
            } else {
                SkPMColor src = aa << SK_A32_SHIFT;
                unsigned dst_scale = 256 - aa;
                int n = count;
                do {
                    --n;
                    device[n] = src + SkAlphaMulQ(device[n], dst_scale);
                } while (n > 0);
            }
        }
        runs += count;
        antialias += count;
        device += count;
    }
}
예제 #13
0
void SkARGB32_Shader_Blitter::blitH(int x, int y, int width) {
    SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width());

    uint32_t*   device = fDevice.getAddr32(x, y);

    if (fXfermode == NULL && (fShader->getFlags() & SkShader::kOpaqueAlpha_Flag)) {
        fShader->shadeSpan(x, y, device, width);
    } else {
        SkPMColor*  span = fBuffer;
        fShader->shadeSpan(x, y, span, width);
        if (fXfermode) {
            fXfermode->xfer32(device, span, width, NULL);
        } else {
            for (int i = 0; i < width; i++) {
                uint32_t src = span[i];
                if (src) {
                    unsigned srcA = SkGetPackedA32(src);
                    if (srcA != 0xFF) {
                        src += SkAlphaMulQ(device[i], SkAlpha255To256(255 - srcA));
                    }
                    device[i] = src;
                }
            }
        }
    }
}
// extract the result vertices and indices from the GrAAConvexTessellator
static void extract_verts(const GrAAConvexTessellator& tess,
                          void* vertices,
                          size_t vertexStride,
                          GrColor color,
                          uint16_t firstIndex,
                          uint16_t* idxs,
                          bool tweakAlphaForCoverage) {
    intptr_t verts = reinterpret_cast<intptr_t>(vertices);

    for (int i = 0; i < tess.numPts(); ++i) {
        *((SkPoint*)((intptr_t)verts + i * vertexStride)) = tess.point(i);
    }

    // Make 'verts' point to the colors
    verts += sizeof(SkPoint);
    for (int i = 0; i < tess.numPts(); ++i) {
        if (tweakAlphaForCoverage) {
            SkASSERT(SkScalarRoundToInt(255.0f * tess.coverage(i)) <= 255);
            unsigned scale = SkScalarRoundToInt(255.0f * tess.coverage(i));
            GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
            *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 
                    tess.coverage(i);
        }
    }

    for (int i = 0; i < tess.numIndices(); ++i) {
        idxs[i] = tess.index(i) + firstIndex;
    }
}
예제 #15
0
void SkTransparentShader::TransparentShaderContext::shadeSpan(int x, int y, SkPMColor span[],
                                                              int count) {
    unsigned scale = SkAlpha255To256(this->getPaintAlpha());

    switch (fDevice->colorType()) {
        case kN32_SkColorType:
            if (scale == 256) {
                SkPMColor* src = fDevice->getAddr32(x, y);
                if (src != span) {
                    memcpy(span, src, count * sizeof(SkPMColor));
                }
            } else {
                const SkPMColor* src = fDevice->getAddr32(x, y);
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkAlphaMulQ(src[i], scale);
                }
            }
            break;
        case kRGB_565_SkColorType: {
            const uint16_t* src = fDevice->getAddr16(x, y);
            if (scale == 256) {
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkPixel16ToPixel32(src[i]);
                }
            } else {
                unsigned alpha = this->getPaintAlpha();
                for (int i = count - 1; i >= 0; --i) {
                    uint16_t c = src[i];
                    unsigned r = SkPacked16ToR32(c);
                    unsigned g = SkPacked16ToG32(c);
                    unsigned b = SkPacked16ToB32(c);

                    span[i] = SkPackARGB32( alpha,
                                            SkAlphaMul(r, scale),
                                            SkAlphaMul(g, scale),
                                            SkAlphaMul(b, scale));
                }
            }
            break;
        }
        case kAlpha_8_SkColorType: {
            const uint8_t* src = fDevice->getAddr8(x, y);
            if (scale == 256) {
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkPackARGB32(src[i], 0, 0, 0);
                }
            } else {
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkPackARGB32(SkAlphaMul(src[i], scale), 0, 0, 0);
                }
            }
            break;
        }
        default:
            SkDEBUGFAIL("colorType not supported as a destination device");
            break;
    }
}
예제 #16
0
void SkARGB32_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
    if (alpha == 0 || fSrcA == 0) {
        return;
    }

    uint32_t* device = fDevice.getAddr32(x, y);
    uint32_t  color = fPMColor;

    if (alpha != 255) {
        color = SkAlphaMulQ(color, SkAlpha255To256(alpha));
    }

    unsigned dst_scale = 255 - SkGetPackedA32(color);
    uint32_t rowBytes = fDevice.rowBytes();
    while (--height >= 0) {
        device[0] = color + SkAlphaMulQ(device[0], dst_scale);
        device = (uint32_t*)((char*)device + rowBytes);
    }
}
예제 #17
0
    virtual void xfer32(SK_RESTRICT SkPMColor dst[],
                        const SK_RESTRICT SkPMColor[], int count,
                        const SK_RESTRICT SkAlpha aa[]) {
        SkASSERT(dst && count >= 0);

        if (NULL == aa) {
            memset(dst, 0, count << 2);
        } else {
            for (int i = count - 1; i >= 0; --i) {
                unsigned a = aa[i];
                if (0xFF == a) {
                    dst[i] = 0;
                } else if (a != 0) {
                    dst[i] = SkAlphaMulQ(dst[i], SkAlpha255To256(255 - a));
                }
            }
        }
    }
예제 #18
0
 virtual void xfer32(SK_RESTRICT SkPMColor dst[],
                     const SK_RESTRICT SkPMColor src[], int count,
                     const SK_RESTRICT SkAlpha aa[]) {
     SkASSERT(dst && src);
     
     if (count <= 0) {
         return;
     }
     if (NULL != aa) {
         return this->INHERITED::xfer32(dst, src, count, aa);
     }
     
     do {
         unsigned a = SkGetPackedA32(*src);
         *dst = SkAlphaMulQ(*dst, SkAlpha255To256(255 - a));
         dst++;
         src++;
     } while (--count != 0);
 }
예제 #19
0
//  kDstOut_Mode,   //!< [Da * (1 - Sa), Dc * (1 - Sa)]
static SkPMColor dstout_modeproc(SkPMColor src, SkPMColor dst) {
    return SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src)));
}
예제 #20
0
//  kSrcIn_Mode,    //!< [Sa * Da, Sc * Da]
static SkPMColor srcin_modeproc(SkPMColor src, SkPMColor dst) {
    return SkAlphaMulQ(src, SkAlpha255To256(SkGetPackedA32(dst)));
}
예제 #21
0
//  kDstOver_Mode,  //!< [Sa + Da - Sa*Da, Dc + (1 - Da)*Sc]
static SkPMColor dstover_modeproc(SkPMColor src, SkPMColor dst) {
    // this is the reverse of srcover, just flipping src and dst
    // see srcover's comment about the 256 for opaqueness guarantees
    return dst + SkAlphaMulQ(src, 256 - SkGetPackedA32(dst));
}
예제 #22
0
    void generateAAStrokeRectGeometry(void* vertices,
                                      size_t offset,
                                      size_t vertexStride,
                                      int outerVertexNum,
                                      int innerVertexNum,
                                      GrColor color,
                                      const SkRect& devOutside,
                                      const SkRect& devOutsideAssist,
                                      const SkRect& devInside,
                                      bool miterStroke,
                                      bool tweakAlphaForCoverage) const {
        intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;

        // We create vertices for four nested rectangles. There are two ramps from 0 to full
        // coverage, one on the exterior of the stroke and the other on the interior.
        // The following pointers refer to the four rects, from outermost to innermost.
        SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
        SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vertexStride);
        SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vertexStride);
        SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(verts +
                                                      (2 * outerVertexNum + innerVertexNum) *
                                                      vertexStride);

    #ifndef SK_IGNORE_THIN_STROKED_RECT_FIX
        // TODO: this only really works if the X & Y margins are the same all around
        // the rect (or if they are all >= 1.0).
        SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight);
        inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft);
        inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop);
        if (miterStroke) {
            inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom);
        } else {
            inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom -
                                                       devInside.fBottom);
        }
        SkASSERT(inset >= 0);
    #else
        SkScalar inset = SK_ScalarHalf;
    #endif

        if (miterStroke) {
            // outermost
            set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
            // inner two
            set_inset_fan(fan1Pos, vertexStride, devOutside,  inset,  inset);
            set_inset_fan(fan2Pos, vertexStride, devInside,  -inset, -inset);
            // innermost
            set_inset_fan(fan3Pos, vertexStride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
        } else {
            SkPoint* fan0AssistPos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);
            SkPoint* fan1AssistPos = reinterpret_cast<SkPoint*>(verts +
                                                                (outerVertexNum + 4) *
                                                                vertexStride);
            // outermost
            set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
            set_inset_fan(fan0AssistPos, vertexStride, devOutsideAssist, -SK_ScalarHalf,
                          -SK_ScalarHalf);
            // outer one of the inner two
            set_inset_fan(fan1Pos, vertexStride, devOutside,  inset,  inset);
            set_inset_fan(fan1AssistPos, vertexStride, devOutsideAssist,  inset,  inset);
            // inner one of the inner two
            set_inset_fan(fan2Pos, vertexStride, devInside,  -inset, -inset);
            // innermost
            set_inset_fan(fan3Pos, vertexStride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
        }

        // Make verts point to vertex color and then set all the color and coverage vertex attrs
        // values. The outermost rect has 0 coverage
        verts += sizeof(SkPoint);
        for (int i = 0; i < outerVertexNum; ++i) {
            if (tweakAlphaForCoverage) {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
            } else {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
                *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
            }
        }

        // scale is the coverage for the the inner two rects.
        int scale;
        if (inset < SK_ScalarHalf) {
            scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
            SkASSERT(scale >= 0 && scale <= 255);
        } else {
            scale = 0xff;
        }

        float innerCoverage = GrNormalizeByteToFloat(scale);
        GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);

        verts += outerVertexNum * vertexStride;
        for (int i = 0; i < outerVertexNum + innerVertexNum; ++i) {
            if (tweakAlphaForCoverage) {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
            } else {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
                *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) =
                        innerCoverage;
            }
        }

        // The innermost rect has 0 coverage
        verts += (outerVertexNum + innerVertexNum) * vertexStride;
        for (int i = 0; i < innerVertexNum; ++i) {
            if (tweakAlphaForCoverage) {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
            } else {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
                *reinterpret_cast<GrColor*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
            }
        }
    }
예제 #23
0
static void generate_aa_fill_rect_geometry(intptr_t verts,
                                           size_t vertexStride,
                                           GrColor color,
                                           const SkMatrix& viewMatrix,
                                           const SkRect& rect,
                                           const SkRect& devRect,
                                           bool tweakAlphaForCoverage,
                                           const SkMatrix* localMatrix) {
    SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
    SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);

    SkScalar inset;

    if (viewMatrix.rectStaysRect()) {
        inset = SkMinScalar(devRect.width(), SK_Scalar1);
        inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height());

        set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
        set_inset_fan(fan1Pos, vertexStride, devRect, inset, inset);
    } else {
        // compute transformed (1, 0) and (0, 1) vectors
        SkVector vec[2] = {{viewMatrix[SkMatrix::kMScaleX], viewMatrix[SkMatrix::kMSkewY]},
                           {viewMatrix[SkMatrix::kMSkewX], viewMatrix[SkMatrix::kMScaleY]}};

        SkScalar len1 = SkPoint::Normalize(&vec[0]);
        vec[0].scale(SK_ScalarHalf);
        SkScalar len2 = SkPoint::Normalize(&vec[1]);
        vec[1].scale(SK_ScalarHalf);

        inset = SkMinScalar(len1 * rect.width(), SK_Scalar1);
        inset = SK_ScalarHalf * SkMinScalar(inset, len2 * rect.height());

        // create the rotated rect
        SkPointPriv::SetRectFan(fan0Pos, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom,
                vertexStride);
        SkMatrixPriv::MapPointsWithStride(viewMatrix, fan0Pos, vertexStride, 4);

        // Now create the inset points and then outset the original
        // rotated points

        // TL
        *((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1];
        // BL
        *((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1];
        // BR
        *((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1];
        // TR
        *((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1];
    }

    if (localMatrix) {
        SkMatrix invViewMatrix;
        if (!viewMatrix.invert(&invViewMatrix)) {
            SkDebugf("View matrix is non-invertible, local coords will be wrong.");
            invViewMatrix = SkMatrix::I();
        }
        SkMatrix localCoordMatrix;
        localCoordMatrix.setConcat(*localMatrix, invViewMatrix);
        SkPoint* fan0Loc = reinterpret_cast<SkPoint*>(verts + sizeof(SkPoint) + sizeof(GrColor));
        SkMatrixPriv::MapPointsWithStride(localCoordMatrix, fan0Loc, vertexStride, fan0Pos,
                                          vertexStride, 8);
    }

    // Make verts point to vertex color and then set all the color and coverage vertex attrs
    // values.
    verts += sizeof(SkPoint);

    // The coverage offset is always the last vertex attribute
    intptr_t coverageOffset = vertexStride - sizeof(GrColor) - sizeof(SkPoint);
    for (int i = 0; i < 4; ++i) {
        if (tweakAlphaForCoverage) {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
            *reinterpret_cast<float*>(verts + i * vertexStride + coverageOffset) = 0;
        }
    }

    int scale;
    if (inset < SK_ScalarHalf) {
        scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
        SkASSERT(scale >= 0 && scale <= 255);
    } else {
        scale = 0xff;
    }

    verts += 4 * vertexStride;

    float innerCoverage = GrNormalizeByteToFloat(scale);
    GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);

    for (int i = 0; i < 4; ++i) {
        if (tweakAlphaForCoverage) {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
            *reinterpret_cast<float*>(verts + i * vertexStride + coverageOffset) = innerCoverage;
        }
    }
}
예제 #24
0
void GrAARectRenderer::geometryFillAARect(GrDrawTarget* target,
                                          GrDrawState* drawState,
                                          GrColor color,
                                          const SkRect& rect,
                                          const SkMatrix& combinedMatrix,
                                          const SkRect& devRect) {
    GrDrawState::AutoRestoreEffects are(drawState);

    CoverageAttribType type;
    SkAutoTUnref<const GrGeometryProcessor> gp(create_rect_gp(*drawState, color, &type));

    size_t vertexStride = gp->getVertexStride();
    GrDrawTarget::AutoReleaseGeometry geo(target, 8, vertexStride, 0);
    if (!geo.succeeded()) {
        SkDebugf("Failed to get space for vertices!\n");
        return;
    }

    if (NULL == fAAFillRectIndexBuffer) {
        fAAFillRectIndexBuffer = fGpu->createInstancedIndexBuffer(gFillAARectIdx,
                                                                  kIndicesPerAAFillRect,
                                                                  kNumAAFillRectsInIndexBuffer,
                                                                  kVertsPerAAFillRect);
    }
    GrIndexBuffer* indexBuffer = fAAFillRectIndexBuffer;
    if (NULL == indexBuffer) {
        SkDebugf("Failed to create index buffer!\n");
        return;
    }

    intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());

    SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
    SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);

    SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1);
    inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height());

    if (combinedMatrix.rectStaysRect()) {
        // Temporarily #if'ed out. We don't want to pass in the devRect but
        // right now it is computed in GrContext::apply_aa_to_rect and we don't
        // want to throw away the work
#if 0
        SkRect devRect;
        combinedMatrix.mapRect(&devRect, rect);
#endif

        set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
        set_inset_fan(fan1Pos, vertexStride, devRect, inset,  inset);
    } else {
        // compute transformed (1, 0) and (0, 1) vectors
        SkVector vec[2] = {
          { combinedMatrix[SkMatrix::kMScaleX], combinedMatrix[SkMatrix::kMSkewY] },
          { combinedMatrix[SkMatrix::kMSkewX],  combinedMatrix[SkMatrix::kMScaleY] }
        };

        vec[0].normalize();
        vec[0].scale(SK_ScalarHalf);
        vec[1].normalize();
        vec[1].scale(SK_ScalarHalf);

        // create the rotated rect
        fan0Pos->setRectFan(rect.fLeft, rect.fTop,
                            rect.fRight, rect.fBottom, vertexStride);
        combinedMatrix.mapPointsWithStride(fan0Pos, vertexStride, 4);

        // Now create the inset points and then outset the original
        // rotated points

        // TL
        *((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) =
            *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1];
        // BL
        *((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) =
            *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1];
        // BR
        *((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) =
            *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1];
        // TR
        *((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) =
            *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1];
        *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1];
    }

    // Make verts point to vertex color and then set all the color and coverage vertex attrs values.
    verts += sizeof(SkPoint);
    for (int i = 0; i < 4; ++i) {
        if (kUseCoverage_CoverageAttribType == type) {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
            *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
        }
    }

    int scale;
    if (inset < SK_ScalarHalf) {
        scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
        SkASSERT(scale >= 0 && scale <= 255);
    } else {
        scale = 0xff;
    }

    verts += 4 * vertexStride;

    float innerCoverage = GrNormalizeByteToFloat(scale);
    GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);

    for (int i = 0; i < 4; ++i) {
        if (kUseCoverage_CoverageAttribType == type) {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
            *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = innerCoverage;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
        }
    }

    target->setIndexSourceToBuffer(indexBuffer);
    target->drawIndexedInstances(drawState,
                                 gp,
                                 kTriangles_GrPrimitiveType,
                                 1,
                                 kVertsPerAAFillRect,
                                 kIndicesPerAAFillRect);
    target->resetIndexSource();
}
예제 #25
0
void SkTransparentShader::shadeSpan(int x, int y, SkPMColor span[], int count) {
    unsigned scale = SkAlpha255To256(fAlpha);

    switch (fDevice->getConfig()) {
        case SkBitmap::kARGB_8888_Config:
            if (scale == 256) {
                SkPMColor* src = fDevice->getAddr32(x, y);
                if (src != span) {
                    memcpy(span, src, count * sizeof(SkPMColor));
                }
            } else {
                const SkPMColor* src = fDevice->getAddr32(x, y);
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkAlphaMulQ(src[i], scale);
                }
            }
            break;
        case SkBitmap::kRGB_565_Config: {
            const uint16_t* src = fDevice->getAddr16(x, y);
            if (scale == 256) {
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkPixel16ToPixel32(src[i]);
                }
            } else {
                unsigned alpha = fAlpha;
                for (int i = count - 1; i >= 0; --i) {
                    uint16_t c = src[i];
                    unsigned r = SkPacked16ToR32(c);
                    unsigned g = SkPacked16ToG32(c);
                    unsigned b = SkPacked16ToB32(c);

                    span[i] = SkPackARGB32( alpha,
                                            SkAlphaMul(r, scale),
                                            SkAlphaMul(g, scale),
                                            SkAlphaMul(b, scale));
                }
            }
            break;
        }
        case SkBitmap::kARGB_4444_Config: {
            const uint16_t* src = fDevice->getAddr16(x, y);
            if (scale == 256) {
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkPixel4444ToPixel32(src[i]);
                }
            } else {
                unsigned scale16 = scale >> 4;
                for (int i = count - 1; i >= 0; --i) {
                    uint32_t c = SkExpand_4444(src[i]) * scale16;
                    span[i] = SkCompact_8888(c);
                }
            }
            break;
        }
        case SkBitmap::kIndex8_Config:
            SkDEBUGFAIL("index8 not supported as a destination device");
            break;
        case SkBitmap::kA8_Config: {
            const uint8_t* src = fDevice->getAddr8(x, y);
            if (scale == 256) {
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkPackARGB32(src[i], 0, 0, 0);
                }
            } else {
                for (int i = count - 1; i >= 0; --i) {
                    span[i] = SkPackARGB32(SkAlphaMul(src[i], scale), 0, 0, 0);
                }
            }
            break;
        }
        case SkBitmap::kA1_Config:
            SkDEBUGFAIL("kA1_Config umimplemented at this time");
            break;
        default:    // to avoid warnings
            break;
    }
}
예제 #26
0
void SkComposeShader::ComposeShaderContext::shadeSpan(int x, int y, SkPMColor result[], int count) {
    SkShader::Context* shaderContextA = fShaderContextA;
    SkShader::Context* shaderContextB = fShaderContextB;
    SkXfermode*        mode = static_cast<const SkComposeShader&>(fShader).fMode;
    unsigned           scale = SkAlpha255To256(this->getPaintAlpha());

#ifdef SK_BUILD_FOR_ANDROID
    scale = 256;    // ugh -- maintain old bug/behavior for now
#endif

    SkPMColor   tmp[TMP_COLOR_COUNT];

    if (NULL == mode) {   // implied SRC_OVER
        // TODO: when we have a good test-case, should use SkBlitRow::Proc32
        // for these loops
        do {
            int n = count;
            if (n > TMP_COLOR_COUNT) {
                n = TMP_COLOR_COUNT;
            }

            shaderContextA->shadeSpan(x, y, result, n);
            shaderContextB->shadeSpan(x, y, tmp, n);

            if (256 == scale) {
                for (int i = 0; i < n; i++) {
                    result[i] = SkPMSrcOver(tmp[i], result[i]);
                }
            } else {
                for (int i = 0; i < n; i++) {
                    result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]),
                                            scale);
                }
            }

            result += n;
            x += n;
            count -= n;
        } while (count > 0);
    } else {    // use mode for the composition
        do {
            int n = count;
            if (n > TMP_COLOR_COUNT) {
                n = TMP_COLOR_COUNT;
            }

            shaderContextA->shadeSpan(x, y, result, n);
            shaderContextB->shadeSpan(x, y, tmp, n);
            mode->xfer32(result, tmp, n, NULL);

            if (256 != scale) {
                for (int i = 0; i < n; i++) {
                    result[i] = SkAlphaMulQ(result[i], scale);
                }
            }

            result += n;
            x += n;
            count -= n;
        } while (count > 0);
    }
}
예제 #27
0
    void generateAAFillRectGeometry(void* vertices,
                                    size_t offset,
                                    size_t vertexStride,
                                    GrColor color,
                                    const SkMatrix& viewMatrix,
                                    const SkRect& rect,
                                    const SkRect& devRect,
                                    bool tweakAlphaForCoverage) const {
        intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;

        SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
        SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);

        SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1);
        inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height());

        if (viewMatrix.rectStaysRect()) {
            set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
            set_inset_fan(fan1Pos, vertexStride, devRect, inset,  inset);
        } else {
            // compute transformed (1, 0) and (0, 1) vectors
            SkVector vec[2] = {
              { viewMatrix[SkMatrix::kMScaleX], viewMatrix[SkMatrix::kMSkewY] },
              { viewMatrix[SkMatrix::kMSkewX],  viewMatrix[SkMatrix::kMScaleY] }
            };

            vec[0].normalize();
            vec[0].scale(SK_ScalarHalf);
            vec[1].normalize();
            vec[1].scale(SK_ScalarHalf);

            // create the rotated rect
            fan0Pos->setRectFan(rect.fLeft, rect.fTop,
                                rect.fRight, rect.fBottom, vertexStride);
            viewMatrix.mapPointsWithStride(fan0Pos, vertexStride, 4);

            // Now create the inset points and then outset the original
            // rotated points

            // TL
            *((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1];
            // BL
            *((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1];
            // BR
            *((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1];
            // TR
            *((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1];
        }

        // Make verts point to vertex color and then set all the color and coverage vertex attrs
        // values.
        verts += sizeof(SkPoint);
        for (int i = 0; i < 4; ++i) {
            if (tweakAlphaForCoverage) {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
            } else {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
                *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
            }
        }

        int scale;
        if (inset < SK_ScalarHalf) {
            scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
            SkASSERT(scale >= 0 && scale <= 255);
        } else {
            scale = 0xff;
        }

        verts += 4 * vertexStride;

        float innerCoverage = GrNormalizeByteToFloat(scale);
        GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);

        for (int i = 0; i < 4; ++i) {
            if (tweakAlphaForCoverage) {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
            } else {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
                *reinterpret_cast<float*>(verts + i * vertexStride +
                                          sizeof(GrColor)) = innerCoverage;
            }
        }
    }
static inline SkPMColor luma_proc(const SkPMColor a, const SkPMColor b) {
    unsigned luma = SkComputeLuminance(SkGetPackedR32(b),
                                       SkGetPackedG32(b),
                                       SkGetPackedB32(b));
    return SkAlphaMulQ(a, SkAlpha255To256(luma));
}
예제 #29
0
void GrAARectRenderer::geometryStrokeAARect(GrDrawTarget* target,
                                            GrDrawState* drawState,
                                            GrColor color,
                                            const SkRect& devOutside,
                                            const SkRect& devOutsideAssist,
                                            const SkRect& devInside,
                                            bool miterStroke) {
    GrDrawState::AutoRestoreEffects are(drawState);

    CoverageAttribType type;
    SkAutoTUnref<const GrGeometryProcessor> gp(create_rect_gp(*drawState, color, &type));

    int innerVertexNum = 4;
    int outerVertexNum = miterStroke ? 4 : 8;
    int totalVertexNum = (outerVertexNum + innerVertexNum) * 2;

    size_t vstride = gp->getVertexStride();
    GrDrawTarget::AutoReleaseGeometry geo(target, totalVertexNum, vstride, 0);
    if (!geo.succeeded()) {
        SkDebugf("Failed to get space for vertices!\n");
        return;
    }
    GrIndexBuffer* indexBuffer = this->aaStrokeRectIndexBuffer(miterStroke);
    if (NULL == indexBuffer) {
        SkDebugf("Failed to create index buffer!\n");
        return;
    }

    intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());

    // We create vertices for four nested rectangles. There are two ramps from 0 to full
    // coverage, one on the exterior of the stroke and the other on the interior.
    // The following pointers refer to the four rects, from outermost to innermost.
    SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
    SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vstride);
    SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vstride);
    SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(verts + (2 * outerVertexNum + innerVertexNum) * vstride);

#ifndef SK_IGNORE_THIN_STROKED_RECT_FIX
    // TODO: this only really works if the X & Y margins are the same all around
    // the rect (or if they are all >= 1.0).
    SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight);
    inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft);
    inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop);
    if (miterStroke) {
        inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom);
    } else {
        inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom - devInside.fBottom);
    }
    SkASSERT(inset >= 0);
#else
    SkScalar inset = SK_ScalarHalf;
#endif

    if (miterStroke) {
        // outermost
        set_inset_fan(fan0Pos, vstride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
        // inner two
        set_inset_fan(fan1Pos, vstride, devOutside,  inset,  inset);
        set_inset_fan(fan2Pos, vstride, devInside,  -inset, -inset);
        // innermost
        set_inset_fan(fan3Pos, vstride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
    } else {
        SkPoint* fan0AssistPos = reinterpret_cast<SkPoint*>(verts + 4 * vstride);
        SkPoint* fan1AssistPos = reinterpret_cast<SkPoint*>(verts + (outerVertexNum + 4) * vstride);
        // outermost
        set_inset_fan(fan0Pos, vstride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
        set_inset_fan(fan0AssistPos, vstride, devOutsideAssist, -SK_ScalarHalf, -SK_ScalarHalf);
        // outer one of the inner two
        set_inset_fan(fan1Pos, vstride, devOutside,  inset,  inset);
        set_inset_fan(fan1AssistPos, vstride, devOutsideAssist,  inset,  inset);
        // inner one of the inner two
        set_inset_fan(fan2Pos, vstride, devInside,  -inset, -inset);
        // innermost
        set_inset_fan(fan3Pos, vstride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
    }

    // Make verts point to vertex color and then set all the color and coverage vertex attrs values.
    // The outermost rect has 0 coverage
    verts += sizeof(SkPoint);
    for (int i = 0; i < outerVertexNum; ++i) {
        if (kUseCoverage_CoverageAttribType == type) {
            *reinterpret_cast<GrColor*>(verts + i * vstride) = color;
            *reinterpret_cast<float*>(verts + i * vstride + sizeof(GrColor)) = 0;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vstride) = 0;
        }
    }

    // scale is the coverage for the the inner two rects.
    int scale;
    if (inset < SK_ScalarHalf) {
        scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
        SkASSERT(scale >= 0 && scale <= 255);
    } else {
        scale = 0xff;
    }

    float innerCoverage = GrNormalizeByteToFloat(scale);
    GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);

    verts += outerVertexNum * vstride;
    for (int i = 0; i < outerVertexNum + innerVertexNum; ++i) {
        if (kUseCoverage_CoverageAttribType == type) {
            *reinterpret_cast<GrColor*>(verts + i * vstride) = color;
            *reinterpret_cast<float*>(verts + i * vstride + sizeof(GrColor)) = innerCoverage;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vstride) = scaledColor;
        }
    }

    // The innermost rect has 0 coverage
    verts += (outerVertexNum + innerVertexNum) * vstride;
    for (int i = 0; i < innerVertexNum; ++i) {
        if (kUseCoverage_CoverageAttribType == type) {
            *reinterpret_cast<GrColor*>(verts + i * vstride) = color;
            *reinterpret_cast<GrColor*>(verts + i * vstride + sizeof(GrColor)) = 0;
        } else {
            *reinterpret_cast<GrColor*>(verts + i * vstride) = 0;
        }
    }

    target->setIndexSourceToBuffer(indexBuffer);
    target->drawIndexedInstances(drawState,
                                 gp,
                                 kTriangles_GrPrimitiveType,
                                 1,
                                 totalVertexNum,
                                 aa_stroke_rect_index_count(miterStroke));
    target->resetIndexSource();
}