try our first special-case shaderproc

git-svn-id: http://skia.googlecode.com/svn/trunk@268 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 83 insertions, 0 deletions

diff --git a/src/core/SkBitmapProcState_shaderproc.h b/src/core/SkBitmapProcState_shaderproc.h
new file mode 100644
index 0000000000..66a6627141
--- /dev/null
+++ b/src/core/SkBitmapProcState_shaderproc.h
@@ -0,0 +1,83 @@
+#define SCALE_FILTER_NAME       MAKENAME(_filter_DX_shaderproc)
+
+#ifndef PREAMBLE
+    #define PREAMBLE(state)
+    #define PREAMBLE_PARAM_X
+    #define PREAMBLE_PARAM_Y
+    #define PREAMBLE_ARG_X
+    #define PREAMBLE_ARG_Y
+#endif
+
+
+static void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y,
+                              DSTTYPE* SK_RESTRICT colors, int count) {
+    SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
+                             SkMatrix::kScale_Mask)) == 0);
+    SkASSERT(s.fInvKy == 0);
+    SkASSERT(count > 0 && colors != NULL);
+    SkASSERT(s.fDoFilter);
+    SkDEBUGCODE(CHECKSTATE(s);)
+    
+    PREAMBLE(s);
+    
+    const unsigned maxX = s.fBitmap->width() - 1;
+    const SkFixed oneX = s.fFilterOneX;
+    const SkFixed dx = s.fInvSx;
+    SkFixed fx;
+    const SRCTYPE* SK_RESTRICT row0;
+    const SRCTYPE* SK_RESTRICT row1;
+    unsigned subY;
+
+    {
+        SkPoint pt;
+        s.fInvProc(*s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
+                   SkIntToScalar(y) + SK_ScalarHalf, &pt);
+        SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
+        const unsigned maxY = s.fBitmap->height() - 1;
+        // compute our two Y values up front
+        subY = TILEY_LOW_BITS(fy, maxY);
+        int y0 = TILEY_PROCF(fy, maxY);
+        int y1 = TILEY_PROCF((fy + s.fFilterOneY), maxY);
+
+        const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels();
+        unsigned rb = s.fBitmap->rowBytes();
+        row0 = (const SRCTYPE*)(srcAddr + y0 * rb);
+        row1 = (const SRCTYPE*)(srcAddr + y1 * rb);
+        // now initialize fx
+        fx = SkScalarToFixed(pt.fX) - (oneX >> 1);
+    }
+    
+    do {
+        unsigned subX = TILEX_LOW_BITS(fx, maxX);
+        unsigned x0 = TILEX_PROCF(fx, maxX);
+        unsigned x1 = TILEX_PROCF((fx + oneX), maxX);
+
+        uint32_t c = FILTER_PROC(subX, subY,
+                                 SRC_TO_FILTER(row0[x0]),
+                                 SRC_TO_FILTER(row0[x1]),
+                                 SRC_TO_FILTER(row1[x0]),
+                                 SRC_TO_FILTER(row1[x1]));
+        *colors++ = FILTER_TO_DST(c);
+        
+        fx += dx;
+    } while (--count != 0);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#undef MAKENAME
+#undef TILEX_PROCF
+#undef TILEY_PROCF
+#undef TILEX_LOW_BITS
+#undef TILEY_LOW_BITS
+#ifdef CHECK_FOR_DECAL
+    #undef CHECK_FOR_DECAL
+#endif
+
+#undef SCALE_FILTER_NAME
+
+#undef PREAMBLE
+#undef PREAMBLE_PARAM_X
+#undef PREAMBLE_PARAM_Y
+#undef PREAMBLE_ARG_X
+#undef PREAMBLE_ARG_Y