move SkBlitRow.h out of public

BUG=skia:

Change-Id: I9a9c04fdb9fcfe50d57b28fa560a9b3d5499b699
Reviewed-on: https://skia-review.googlesource.com/6734
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/src/core/SkBlitRow.h b/src/core/SkBlitRow.h
new file mode 100644
index 0000000000..56121eba78
--- /dev/null
+++ b/src/core/SkBlitRow.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkBlitRow_DEFINED
+#define SkBlitRow_DEFINED
+
+#include "SkBitmap.h"
+#include "SkColor.h"
+
+class SkBlitRow {
+public:
+    enum Flags16 {
+        //! If set, the alpha parameter will be != 255
+        kGlobalAlpha_Flag   = 0x01,
+        //! If set, the src colors may have alpha != 255
+        kSrcPixelAlpha_Flag = 0x02,
+        //! If set, the resulting 16bit colors should be dithered
+        kDither_Flag        = 0x04
+    };
+
+    /** Function pointer that reads a scanline of src SkPMColors, and writes
+        a corresponding scanline of 16bit colors (specific format based on the
+        config passed to the Factory.
+
+        The x,y params provide the dithering phase for the start of the scanline
+
+        @param alpha A global alpha to be applied to all of the src colors
+        @param x The x coordinate of the beginning of the scanline
+        @param y THe y coordinate of the scanline
+     */
+    typedef void (*Proc16)(uint16_t dst[], const SkPMColor src[], int count,
+                           U8CPU alpha, int x, int y);
+
+    static Proc16 Factory16(unsigned flags);
+
+    /**
+     *  Function pointer that blends a single src color onto a scaline of dst colors.
+     *
+     *  The x,y params provide the dithering phase for the start of the scanline
+     */
+    typedef void (*ColorProc16)(uint16_t dst[], SkPMColor src, int count, int x, int y);
+
+    // Note : we ignore the kGlobalAlpha_Flag setting, but do respect kSrcPixelAlpha_Flag
+    static ColorProc16 ColorFactory16(unsigned flags);
+
+    ///////////// D32 version
+
+    enum Flags32 {
+        kGlobalAlpha_Flag32     = 1 << 0,
+        kSrcPixelAlpha_Flag32   = 1 << 1
+    };
+
+    /** Function pointer that blends 32bit colors onto a 32bit destination.
+        @param dst  array of dst 32bit colors
+        @param src  array of src 32bit colors (w/ or w/o alpha)
+        @param count number of colors to blend
+        @param alpha global alpha to be applied to all src colors
+     */
+    typedef void (*Proc32)(uint32_t dst[], const SkPMColor src[], int count, U8CPU alpha);
+
+    static Proc32 Factory32(unsigned flags32);
+
+    /** Blend a single color onto a row of S32 pixels, writing the result
+        into a row of D32 pixels. src and dst may be the same memory, but
+        if they are not, they may not overlap.
+     */
+    static void Color32(SkPMColor dst[], const SkPMColor src[], int count, SkPMColor color);
+
+    /** These static functions are called by the Factory and Factory32
+        functions, and should return either NULL, or a
+        platform-specific function-ptr to be used in place of the
+        system default.
+     */
+
+    static Proc32 PlatformProcs32(unsigned flags);
+
+    static Proc16 PlatformFactory565(unsigned flags);
+    static ColorProc16 PlatformColorFactory565(unsigned flags);
+
+private:
+    enum {
+        kFlags16_Mask = 7,
+        kFlags32_Mask = 3
+    };
+};
+
+#endif