arm: dynamic NEON support for SkBitmapProcState functions.

This patch does the following:

  - Move the NEON-specific code from src/core/SkBitmapProcState_filter.h
    to src/opts/SkBitmapProcState_filter_neon.h

  - Implement the NEON-specific functions in the new source file
    src/opts/SkBitmapProcState_opts_arm_neon.cpp, added to the "opts_neon"
    static library target. All functions now use the _neon suffix, even
    in full-NEON builds.

  - Move most of the content of src/core/SkBitmapProcState.cpp to a
    new header: src/core/SkBitmapProcState_procs.h

This header is included by two source files:

  src/core/SkBitmapProcState.cpp, to define the regular functions.
  src/opts/SkBitmapProcState_opts_arm_neon.cpp to define NEON ones.

This is to deal with the fact that all NEON functions now
use the _neon suffix, even in SK_ARM_NEON_IS_ALWAYS mode,
and to be able to include the same header twice in the
SK_ARM_NEON_IS_DYNAMIC case.
Review URL: https://codereview.appspot.com/6449117

git-svn-id: http://skia.googlecode.com/svn/trunk@5055 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 343 insertions, 0 deletions

diff --git a/src/core/SkBitmapProcState_procs.h b/src/core/SkBitmapProcState_procs.h
new file mode 100644
index 0000000000..1b9328edc7
--- /dev/null
+++ b/src/core/SkBitmapProcState_procs.h
@@ -0,0 +1,343 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+// Define NAME_WRAP(x) before including this header to perform name-wrapping
+// E.g. for ARM NEON, defined it as 'x ## _neon' to ensure all important
+// identifiers have a _neon suffix.
+#ifndef NAME_WRAP
+#error "Please define NAME_WRAP() before including this file"
+#endif
+
+// returns expanded * 5bits
+static inline uint32_t Filter_565_Expanded(unsigned x, unsigned y,
+                                           uint32_t a00, uint32_t a01,
+                                           uint32_t a10, uint32_t a11) {
+    SkASSERT((unsigned)x <= 0xF);
+    SkASSERT((unsigned)y <= 0xF);
+    
+    a00 = SkExpand_rgb_16(a00);
+    a01 = SkExpand_rgb_16(a01);
+    a10 = SkExpand_rgb_16(a10);
+    a11 = SkExpand_rgb_16(a11);
+    
+    int xy = x * y >> 3;
+    return  a00 * (32 - 2*y - 2*x + xy) +
+            a01 * (2*x - xy) +
+            a10 * (2*y - xy) +
+            a11 * xy;
+}
+
+// turn an expanded 565 * 5bits into SkPMColor
+// g:11 | r:10 | x:1 | b:10
+static inline SkPMColor SkExpanded_565_To_PMColor(uint32_t c) {
+    unsigned r = (c >> 13) & 0xFF;
+    unsigned g = (c >> 24);
+    unsigned b = (c >> 2) & 0xFF;
+    return SkPackARGB32(0xFF, r, g, b);
+}
+
+// returns answer in SkPMColor format
+static inline SkPMColor Filter_4444_D32(unsigned x, unsigned y,
+                                        uint32_t a00, uint32_t a01,
+                                        uint32_t a10, uint32_t a11) {
+    SkASSERT((unsigned)x <= 0xF);
+    SkASSERT((unsigned)y <= 0xF);
+    
+    a00 = SkExpand_4444(a00);
+    a01 = SkExpand_4444(a01);
+    a10 = SkExpand_4444(a10);
+    a11 = SkExpand_4444(a11);
+
+    int xy = x * y >> 4;
+    uint32_t result =   a00 * (16 - y - x + xy) +
+                        a01 * (x - xy) +
+                        a10 * (y - xy) +
+                        a11 * xy;
+
+    return SkCompact_8888(result);
+}
+
+static inline U8CPU Filter_8(unsigned x, unsigned y,
+                             U8CPU a00, U8CPU a01,
+                             U8CPU a10, U8CPU a11) {
+    SkASSERT((unsigned)x <= 0xF);
+    SkASSERT((unsigned)y <= 0xF);
+    
+    int xy = x * y;
+    unsigned result =   a00 * (256 - 16*y - 16*x + xy) +
+                        a01 * (16*x - xy) +
+                        a10 * (16*y - xy) +
+                        a11 * xy;
+    
+    return result >> 8;
+}
+
+/*****************************************************************************
+ *
+ *  D32 functions
+ *
+ */
+
+// SRC == 8888
+
+#define FILTER_PROC(x, y, a, b, c, d, dst)   NAME_WRAP(Filter_32_opaque)(x, y, a, b, c, d, dst)
+
+#define MAKENAME(suffix)        NAME_WRAP(S32_opaque_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 SkPMColor
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kARGB_8888_Config); \
+                                SkASSERT(state.fAlphaScale == 256)
+#define RETURNDST(src)          src
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst)   NAME_WRAP(Filter_32_alpha)(x, y, a, b, c, d, dst, alphaScale)
+
+#define MAKENAME(suffix)        NAME_WRAP(S32_alpha_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 SkPMColor
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kARGB_8888_Config); \
+                                SkASSERT(state.fAlphaScale < 256)
+#define PREAMBLE(state)         unsigned alphaScale = state.fAlphaScale
+#define RETURNDST(src)          SkAlphaMulQ(src, alphaScale)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+// SRC == 565
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst) \
+    do {                                                        \
+        uint32_t tmp = Filter_565_Expanded(x, y, a, b, c, d);   \
+        *(dst) = SkExpanded_565_To_PMColor(tmp);                \
+    } while (0)
+
+#define MAKENAME(suffix)        NAME_WRAP(S16_opaque_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 uint16_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kRGB_565_Config); \
+                                SkASSERT(state.fAlphaScale == 256)
+#define RETURNDST(src)          SkPixel16ToPixel32(src)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst) \
+    do {                                                                    \
+        uint32_t tmp = Filter_565_Expanded(x, y, a, b, c, d);               \
+        *(dst) = SkAlphaMulQ(SkExpanded_565_To_PMColor(tmp), alphaScale);   \
+    } while (0)
+
+#define MAKENAME(suffix)        NAME_WRAP(S16_alpha_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 uint16_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kRGB_565_Config); \
+                                SkASSERT(state.fAlphaScale < 256)
+#define PREAMBLE(state)         unsigned alphaScale = state.fAlphaScale
+#define RETURNDST(src)          SkAlphaMulQ(SkPixel16ToPixel32(src), alphaScale)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+// SRC == Index8
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst)   NAME_WRAP(Filter_32_opaque)(x, y, a, b, c, d, dst)
+
+#define MAKENAME(suffix)        NAME_WRAP(SI8_opaque_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 uint8_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kIndex8_Config); \
+                                SkASSERT(state.fAlphaScale == 256)
+#define PREAMBLE(state)         const SkPMColor* SK_RESTRICT table = state.fBitmap->getColorTable()->lockColors()
+#define RETURNDST(src)          table[src]
+#define SRC_TO_FILTER(src)      table[src]
+#define POSTAMBLE(state)        state.fBitmap->getColorTable()->unlockColors(false)
+#include "SkBitmapProcState_sample.h"
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst)   NAME_WRAP(Filter_32_alpha)(x, y, a, b, c, d, dst, alphaScale)
+
+#define MAKENAME(suffix)        NAME_WRAP(SI8_alpha_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 uint8_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kIndex8_Config); \
+                                SkASSERT(state.fAlphaScale < 256)
+#define PREAMBLE(state)         unsigned alphaScale = state.fAlphaScale; \
+                                const SkPMColor* SK_RESTRICT table = state.fBitmap->getColorTable()->lockColors()
+#define RETURNDST(src)          SkAlphaMulQ(table[src], alphaScale)
+#define SRC_TO_FILTER(src)      table[src]
+#define POSTAMBLE(state)        state.fBitmap->getColorTable()->unlockColors(false)
+#include "SkBitmapProcState_sample.h"
+
+// SRC == 4444
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst)  *(dst) = Filter_4444_D32(x, y, a, b, c, d)
+
+#define MAKENAME(suffix)        NAME_WRAP(S4444_opaque_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 SkPMColor16
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kARGB_4444_Config); \
+                                SkASSERT(state.fAlphaScale == 256)
+#define RETURNDST(src)          SkPixel4444ToPixel32(src)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst)  \
+    do {                                                    \
+        uint32_t tmp = Filter_4444_D32(x, y, a, b, c, d);   \
+        *(dst) = SkAlphaMulQ(tmp, alphaScale);              \
+    } while (0)
+
+#define MAKENAME(suffix)        NAME_WRAP(S4444_alpha_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 SkPMColor16
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kARGB_4444_Config); \
+                                SkASSERT(state.fAlphaScale < 256)
+#define PREAMBLE(state)         unsigned alphaScale = state.fAlphaScale
+#define RETURNDST(src)          SkAlphaMulQ(SkPixel4444ToPixel32(src), alphaScale)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+// SRC == A8
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst) \
+    do {                                                        \
+        unsigned tmp = Filter_8(x, y, a, b, c, d);              \
+        *(dst) = SkAlphaMulQ(pmColor, SkAlpha255To256(tmp));    \
+    } while (0)
+
+#define MAKENAME(suffix)        NAME_WRAP(SA8_alpha_D32 ## suffix)
+#define DSTSIZE                 32
+#define SRCTYPE                 uint8_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kA8_Config);
+#define PREAMBLE(state)         const SkPMColor pmColor = state.fPaintPMColor;
+#define RETURNDST(src)          SkAlphaMulQ(pmColor, SkAlpha255To256(src))
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+/*****************************************************************************
+ *
+ *  D16 functions
+ *
+ */
+
+// SRC == 8888
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst) \
+    do {                                                \
+        SkPMColor dstColor;                             \
+        NAME_WRAP(Filter_32_opaque)(x, y, a, b, c, d, &dstColor);  \
+        (*dst) = SkPixel32ToPixel16(dstColor);          \
+    } while (0)
+
+#define MAKENAME(suffix)        NAME_WRAP(S32_D16 ## suffix)
+#define DSTSIZE                 16
+#define SRCTYPE                 SkPMColor
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kARGB_8888_Config); \
+                                SkASSERT(state.fBitmap->isOpaque())
+#define RETURNDST(src)          SkPixel32ToPixel16(src)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+// SRC == 565
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst) \
+    do {                                                        \
+        uint32_t tmp = Filter_565_Expanded(x, y, a, b, c, d);   \
+        *(dst) = SkCompact_rgb_16((tmp) >> 5);                  \
+    } while (0)
+
+#define MAKENAME(suffix)        NAME_WRAP(S16_D16 ## suffix)
+#define DSTSIZE                 16
+#define SRCTYPE                 uint16_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kRGB_565_Config)
+#define RETURNDST(src)          src
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_sample.h"
+
+// SRC == Index8
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst) \
+    do {                                                        \
+        uint32_t tmp = Filter_565_Expanded(x, y, a, b, c, d);   \
+        *(dst) = SkCompact_rgb_16((tmp) >> 5);                  \
+    } while (0)
+
+#define MAKENAME(suffix)        NAME_WRAP(SI8_D16 ## suffix)
+#define DSTSIZE                 16
+#define SRCTYPE                 uint8_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kIndex8_Config); \
+                                SkASSERT(state.fBitmap->isOpaque())
+#define PREAMBLE(state)         const uint16_t* SK_RESTRICT table = state.fBitmap->getColorTable()->lock16BitCache()
+#define RETURNDST(src)          table[src]
+#define SRC_TO_FILTER(src)      table[src]
+#define POSTAMBLE(state)        state.fBitmap->getColorTable()->unlock16BitCache()
+#include "SkBitmapProcState_sample.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst) \
+    do {                                                        \
+        uint32_t tmp = Filter_565_Expanded(x, y, a, b, c, d);   \
+        *(dst) = SkCompact_rgb_16((tmp) >> 5);                  \
+    } while (0)
+
+
+// clamp
+
+#define TILEX_PROCF(fx, max)    SkClampMax((fx) >> 16, max)
+#define TILEY_PROCF(fy, max)    SkClampMax((fy) >> 16, max)
+#define TILEX_LOW_BITS(fx, max) (((fx) >> 12) & 0xF)
+#define TILEY_LOW_BITS(fy, max) (((fy) >> 12) & 0xF)
+
+#define MAKENAME(suffix)        NAME_WRAP(Clamp_S16_D16 ## suffix)
+#define SRCTYPE                 uint16_t
+#define DSTTYPE                 uint16_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kRGB_565_Config)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_shaderproc.h"
+
+
+#define TILEX_PROCF(fx, max)    (((fx) & 0xFFFF) * ((max) + 1) >> 16)
+#define TILEY_PROCF(fy, max)    (((fy) & 0xFFFF) * ((max) + 1) >> 16)
+#define TILEX_LOW_BITS(fx, max) ((((fx) & 0xFFFF) * ((max) + 1) >> 12) & 0xF)
+#define TILEY_LOW_BITS(fy, max) ((((fy) & 0xFFFF) * ((max) + 1) >> 12) & 0xF)
+
+#define MAKENAME(suffix)        NAME_WRAP(Repeat_S16_D16 ## suffix)
+#define SRCTYPE                 uint16_t
+#define DSTTYPE                 uint16_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kRGB_565_Config)
+#define SRC_TO_FILTER(src)      src
+#include "SkBitmapProcState_shaderproc.h"
+
+
+#define TILEX_PROCF(fx, max)    SkClampMax((fx) >> 16, max)
+#define TILEY_PROCF(fy, max)    SkClampMax((fy) >> 16, max)
+#define TILEX_LOW_BITS(fx, max) (((fx) >> 12) & 0xF)
+#define TILEY_LOW_BITS(fy, max) (((fy) >> 12) & 0xF)
+
+#undef FILTER_PROC
+#define FILTER_PROC(x, y, a, b, c, d, dst)   NAME_WRAP(Filter_32_opaque)(x, y, a, b, c, d, dst)
+#define MAKENAME(suffix)        NAME_WRAP(Clamp_SI8_opaque_D32 ## suffix)
+#define SRCTYPE                 uint8_t
+#define DSTTYPE                 uint32_t
+#define CHECKSTATE(state)       SkASSERT(state.fBitmap->config() == SkBitmap::kIndex8_Config)
+#define PREAMBLE(state)         const SkPMColor* SK_RESTRICT table = state.fBitmap->getColorTable()->lockColors()
+#define SRC_TO_FILTER(src)      table[src]
+#define POSTAMBLE(state)        state.fBitmap->getColorTable()->unlockColors(false)
+#include "SkBitmapProcState_shaderproc.h"
+
+#undef NAME_WRAP
\ No newline at end of file