Add skia to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@16 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 485 insertions, 0 deletions

diff --git a/skia/sgl/SkBlitter_ARGB32.cpp b/skia/sgl/SkBlitter_ARGB32.cpp
new file mode 100644
index 0000000..0fa0e0b
--- /dev/null
+++ b/skia/sgl/SkBlitter_ARGB32.cpp
@@ -0,0 +1,485 @@
+/* libs/graphics/sgl/SkBlitter_ARGB32.cpp
+**
+** Copyright 2006, Google Inc.
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#include "SkCoreBlitters.h"
+#include "SkColorPriv.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkXfermode.h"
+
+SkARGB32_Blitter::SkARGB32_Blitter(const SkBitmap& device, const SkPaint& paint)
+        : INHERITED(device) {
+    uint32_t color = paint.getColor();
+
+    fSrcA = SkColorGetA(color);
+    unsigned scale = SkAlpha255To256(fSrcA);
+    fSrcR = SkAlphaMul(SkColorGetR(color), scale);
+    fSrcG = SkAlphaMul(SkColorGetG(color), scale);
+    fSrcB = SkAlphaMul(SkColorGetB(color), scale);
+
+    fPMColor = SkPackARGB32(fSrcA, fSrcR, fSrcG, fSrcB);
+}
+
+const SkBitmap* SkARGB32_Blitter::justAnOpaqueColor(uint32_t* value) {
+    if (255 == fSrcA) {
+        *value = fPMColor;
+        return &fDevice;
+    }
+    return NULL;
+}
+
+#if defined _WIN32 && _MSC_VER >= 1300  // disable warning : local variable used without having been initialized
+#pragma warning ( push )
+#pragma warning ( disable : 4701 )
+#endif
+
+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;
+        }
+    }
+}
+
+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;
+    }
+}
+
+//////////////////////////////////////////////////////////////////////////////////////
+
+#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                  SkARGB32_BlitBW
+#define SK_BLITBWMASK_ARGS                  , SkPMColor color
+#define SK_BLITBWMASK_BLIT8(mask, dst)      solid_8_pixels(mask, dst, color)
+#define SK_BLITBWMASK_GETADDR               getAddr32
+#define SK_BLITBWMASK_DEVTYPE               uint32_t
+#include "SkBlitBWMaskTemplate.h"
+
+#define blend_8_pixels(mask, dst, sc, dst_scale)                            \
+    do {                                                                    \
+        if (mask & 0x80) { dst[0] = sc + SkAlphaMulQ(dst[0], dst_scale); }  \
+        if (mask & 0x40) { dst[1] = sc + SkAlphaMulQ(dst[1], dst_scale); }  \
+        if (mask & 0x20) { dst[2] = sc + SkAlphaMulQ(dst[2], dst_scale); }  \
+        if (mask & 0x10) { dst[3] = sc + SkAlphaMulQ(dst[3], dst_scale); }  \
+        if (mask & 0x08) { dst[4] = sc + SkAlphaMulQ(dst[4], dst_scale); }  \
+        if (mask & 0x04) { dst[5] = sc + SkAlphaMulQ(dst[5], dst_scale); }  \
+        if (mask & 0x02) { dst[6] = sc + SkAlphaMulQ(dst[6], dst_scale); }  \
+        if (mask & 0x01) { dst[7] = sc + SkAlphaMulQ(dst[7], dst_scale); }  \
+    } while (0)
+
+#define SK_BLITBWMASK_NAME                  SkARGB32_BlendBW
+#define SK_BLITBWMASK_ARGS                  , uint32_t sc, unsigned dst_scale
+#define SK_BLITBWMASK_BLIT8(mask, dst)      blend_8_pixels(mask, dst, sc, dst_scale)
+#define SK_BLITBWMASK_GETADDR               getAddr32
+#define SK_BLITBWMASK_DEVTYPE               uint32_t
+#include "SkBlitBWMaskTemplate.h"
+
+void SkARGB32_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
+    SkASSERT(mask.fBounds.contains(clip));
+    SkASSERT(fSrcA != 0xFF);
+
+    if (fSrcA == 0) {
+        return;
+    }
+
+    if (mask.fFormat == SkMask::kBW_Format) {
+        SkARGB32_BlendBW(fDevice, mask, clip, fPMColor, SkAlpha255To256(255 - fSrcA));
+        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 = SkBlendARGB32(srcColor, *device, aa);
+            device += 1;
+        } while (--w != 0);
+        device = (uint32_t*)((char*)device + devRB);
+        alpha += maskRB;
+    } while (--height != 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);
+}
+
+//////////////////////////////////////////////////////////////////////////////////////
+
+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);
+    }
+}
+
+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());
+        }
+    }
+}
+
+#if defined _WIN32 && _MSC_VER >= 1300
+#pragma warning ( pop )
+#endif
+
+///////////////////////////////////////////////////////////////////////
+
+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);
+    }
+}
+
+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;
+    }
+}
+
+//////////////////////////////////////////////////////////////////////////////////////////
+
+SkARGB32_Shader_Blitter::SkARGB32_Shader_Blitter(const SkBitmap& device,
+                                                 const SkPaint& paint)
+        : INHERITED(device, paint) {
+    fBuffer = (SkPMColor*)sk_malloc_throw(device.width() * (sizeof(SkPMColor)));
+
+    (fXfermode = paint.getXfermode())->safeRef();
+}
+
+SkARGB32_Shader_Blitter::~SkARGB32_Shader_Blitter() {
+    fXfermode->safeUnref();
+    sk_free(fBuffer);
+}
+
+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;
+                }
+            }
+        }
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+void SkARGB32_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
+                                        const int16_t runs[]) {
+    SkPMColor*  span = fBuffer;
+    uint32_t*   device = fDevice.getAddr32(x, y);
+    SkShader*   shader = fShader;
+
+    if (fXfermode) {
+        for (;;) {
+            SkXfermode* xfer = fXfermode;
+
+            int count = *runs;
+            if (count <= 0)
+                break;
+            int aa = *antialias;
+            if (aa) {
+                shader->shadeSpan(x, y, span, count);
+                if (aa == 255) {
+                    xfer->xfer32(device, span, count, NULL);
+                } else {
+                    // count is almost always 1
+                    for (int i = count - 1; i >= 0; --i) {
+                        xfer->xfer32(&device[i], &span[i], 1, antialias);
+                    }
+                }
+            }
+            device += count;
+            runs += count;
+            antialias += count;
+            x += count;
+        } 
+    } else if (fShader->getFlags() & SkShader::kOpaqueAlpha_Flag) {
+        for (;;) {
+            int count = *runs;
+            if (count <= 0) {
+                break;
+            }
+            int aa = *antialias;
+            if (aa) {
+                if (aa == 255) {  // cool, have the shader draw right into the device
+                    shader->shadeSpan(x, y, device, count);
+                } else {
+                    shader->shadeSpan(x, y, span, count);
+                    for (int i = count - 1; i >= 0; --i) {
+                        if (span[i]) {
+                            device[i] = SkBlendARGB32(span[i], device[i], aa);
+                        }
+                    }
+                }
+            }
+            device += count;
+            runs += count;
+            antialias += count;
+            x += count;
+        } 
+    } else {    // no xfermode but we are not opaque
+        for (;;) {
+            int count = *runs;
+            if (count <= 0) {
+                break;
+            }
+            int aa = *antialias;
+            if (aa) {
+                fShader->shadeSpan(x, y, span, count);
+                if (aa == 255) {
+                    for (int i = count - 1; i >= 0; --i) {
+                        if (span[i]) {
+                            device[i] = SkPMSrcOver(span[i], device[i]);
+                        }
+                    }
+                } else {
+                    for (int i = count - 1; i >= 0; --i) {
+                        if (span[i]) {
+                            device[i] = SkBlendARGB32(span[i], device[i], aa);
+                        }
+                    }
+                }
+            }
+            device += count;
+            runs += count;
+            antialias += count;
+            x += count;
+        } 
+    }
+}
+