Remove the remainder of the skia source code from the Chromium repo....

skia/effects/SkEmbossMask.cpp

-/* libs/graphics/effects/SkEmbossMask.cpp
-**
-** Copyright 2006, The Android Open Source Project
-**
-** 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 "SkEmbossMask.h"
-
-static inline int nonzero_to_one(int x)
-{
-#if 0
-    return x != 0;
-#else
-    return ((unsigned)(x | -x)) >> 31;
-#endif
-}
-
-static inline int neq_to_one(int x, int max)
-{
-#if 0
-    return x != max;
-#else
-    SkASSERT(x >= 0 && x <= max);
-    return ((unsigned)(x - max)) >> 31;
-#endif
-}
-
-static inline int neq_to_mask(int x, int max)
-{
-#if 0
-    return -(x != max);
-#else
-    SkASSERT(x >= 0 && x <= max);
-    return (x - max) >> 31;
-#endif
-}
-
-static inline unsigned div255(unsigned x)
-{
-    SkASSERT(x <= (255*255));
-    return x * ((1 << 24) / 255) >> 24;
-}
-
-#define kDelta  32  // small enough to show off angle differences
-
-#include "SkEmbossMask_Table.h"
-
-#if defined(SK_BUILD_FOR_WIN32) && defined(SK_DEBUG)
-
-#include <stdio.h>
-
-void SkEmbossMask_BuildTable()
-{
-    // build it 0..127 x 0..127, so we use 2^15 - 1 in the numerator for our "fixed" table
-
-    FILE* file = ::fopen("SkEmbossMask_Table.h", "w");
-    SkASSERT(file);
-    ::fprintf(file, "#include \"SkTypes.h\"\n\n");
-    ::fprintf(file, "static const U16 gInvSqrtTable[128 * 128] = {\n");
-    for (int dx = 0; dx <= 255/2; dx++)
-    {
-        for (int dy = 0; dy <= 255/2; dy++)
-        {
-            if ((dy & 15) == 0)
-                ::fprintf(file, "\t");
-
-            uint16_t value = SkToU16((1 << 15) / SkSqrt32(dx * dx + dy * dy + kDelta*kDelta/4));
-
-            ::fprintf(file, "0x%04X", value);
-            if (dx * 128 + dy < 128*128-1)
-                ::fprintf(file, ", ");
-            if ((dy & 15) == 15)
-                ::fprintf(file, "\n");
-        }
-    }
-    ::fprintf(file, "};\n#define kDeltaUsedToBuildTable\t%d\n", kDelta);
-    ::fclose(file);
-}
-
-#endif
-
-void SkEmbossMask::Emboss(SkMask* mask, const SkEmbossMaskFilter::Light& light)
-{
-    SkASSERT(kDelta == kDeltaUsedToBuildTable);
-
-    SkASSERT(mask->fFormat == SkMask::k3D_Format);
-
-    int     specular = light.fSpecular;
-    int     ambient = light.fAmbient;
-    SkFixed lx = SkScalarToFixed(light.fDirection[0]);
-    SkFixed ly = SkScalarToFixed(light.fDirection[1]);
-    SkFixed lz = SkScalarToFixed(light.fDirection[2]);
-    SkFixed lz_dot_nz = lz * kDelta;
-    int     lz_dot8 = lz >> 8;
-
-    size_t      planeSize = mask->computeImageSize();
-    uint8_t*    alpha = mask->fImage;
-    uint8_t*    multiply = (uint8_t*)alpha + planeSize;
-    uint8_t*    additive = multiply + planeSize;
-
-    int rowBytes = mask->fRowBytes;
-    int maxy = mask->fBounds.height() - 1;
-    int maxx = mask->fBounds.width() - 1;
-
-    int prev_row = 0;
-    for (int y = 0; y <= maxy; y++)
-    {
-        int next_row = neq_to_mask(y, maxy) & rowBytes;
-
-        for (int x = 0; x <= maxx; x++)
-        {
-            if (alpha[x])
-            {
-                int nx = alpha[x + neq_to_one(x, maxx)] - alpha[x - nonzero_to_one(x)];
-                int ny = alpha[x + next_row] - alpha[x - prev_row];
-
-                SkFixed numer = lx * nx + ly * ny + lz_dot_nz;
-                int     mul = ambient;
-                int     add = 0;
-
-                if (numer > 0)  // preflight when numer/denom will be <= 0
-                {
-#if 0
-                    int denom = SkSqrt32(nx * nx + ny * ny + kDelta*kDelta);
-                    SkFixed dot = numer / denom;
-                    dot >>= 8;  // now dot is 2^8 instead of 2^16
-#else
-                    // can use full numer, but then we need to call SkFixedMul, since
-                    // numer is 24 bits, and our table is 12 bits
-
-                    // SkFixed dot = SkFixedMul(numer, gTable[]) >> 8
-                    SkFixed dot = (unsigned)(numer >> 4) * gInvSqrtTable[(SkAbs32(nx) >> 1 << 7) | (SkAbs32(ny) >> 1)] >> 20;
-#endif
-                    mul = SkFastMin32(mul + dot, 255);
-
-                    // now for the reflection
-
-                    //  R = 2 (Light * Normal) Normal - Light
-                    //  hilite = R * Eye(0, 0, 1)
-
-                    int hilite = (2 * dot - lz_dot8) * lz_dot8 >> 8;
-                    if (hilite > 0)
-                    {
-                        // pin hilite to 255, since our fast math is also a little sloppy
-                        hilite = SkClampMax(hilite, 255);
-
-                        // specular is 4.4
-                        // would really like to compute the fractional part of this
-                        // and then possibly cache a 256 table for a given specular
-                        // value in the light, and just pass that in to this function.
-                        add = hilite;
-                        for (int i = specular >> 4; i > 0; --i)
-                            add = div255(add * hilite);
-                    }
-                }
-                multiply[x] = SkToU8(mul);
-                additive[x] = SkToU8(add);
-
-            //  multiply[x] = 0xFF;
-            //  additive[x] = 0;
-            //  ((uint8_t*)alpha)[x] = alpha[x] * multiply[x] >> 8;
-            }
-        }
-        alpha += rowBytes;
-        multiply += rowBytes;
-        additive += rowBytes;
-        prev_row = rowBytes;
-    }
-}
-
-