From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 gfx/thebes/gfxColor.h | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 gfx/thebes/gfxColor.h

(limited to 'gfx/thebes/gfxColor.h')

diff --git a/gfx/thebes/gfxColor.h b/gfx/thebes/gfxColor.h
new file mode 100644
index 000000000..4ad7d9f06
--- /dev/null
+++ b/gfx/thebes/gfxColor.h
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GFX_COLOR_H
+#define GFX_COLOR_H
+
+#include "mozilla/Attributes.h" // for MOZ_ALWAYS_INLINE
+#include "mozilla/EndianUtils.h" // for mozilla::NativeEndian::swapToBigEndian
+
+/**
+ * GFX_BLOCK_RGB_TO_FRGB(from,to)
+ *   sizeof(*from) == sizeof(char)
+ *   sizeof(*to)   == sizeof(uint32_t)
+ *
+ * Copy 4 pixels at a time, reading blocks of 12 bytes (RGB x4)
+ *   and writing blocks of 16 bytes (FRGB x4)
+ */
+#define GFX_BLOCK_RGB_TO_FRGB(from,to) \
+  PR_BEGIN_MACRO \
+    uint32_t m0 = ((uint32_t*)from)[0], \
+             m1 = ((uint32_t*)from)[1], \
+             m2 = ((uint32_t*)from)[2], \
+             rgbr = mozilla::NativeEndian::swapToBigEndian(m0), \
+             gbrg = mozilla::NativeEndian::swapToBigEndian(m1), \
+             brgb = mozilla::NativeEndian::swapToBigEndian(m2), \
+             p0, p1, p2, p3; \
+    p0 = 0xFF000000 | ((rgbr) >>  8); \
+    p1 = 0xFF000000 | ((rgbr) << 16) | ((gbrg) >> 16); \
+    p2 = 0xFF000000 | ((gbrg) <<  8) | ((brgb) >> 24); \
+    p3 = 0xFF000000 | (brgb); \
+    to[0] = p0; to[1] = p1; to[2] = p2; to[3] = p3; \
+  PR_END_MACRO
+
+/**
+ * Fast approximate division by 255. It has the property that
+ * for all 0 <= n <= 255*255, GFX_DIVIDE_BY_255(n) == n/255.
+ * But it only uses two adds and two shifts instead of an
+ * integer division (which is expensive on many processors).
+ *
+ * equivalent to ((v)/255)
+ */
+#define GFX_DIVIDE_BY_255(v)  \
+     (((((unsigned)(v)) << 8) + ((unsigned)(v)) + 255) >> 16)
+
+/**
+ * Fast premultiply
+ *
+ * equivalent to (((c)*(a))/255)
+ */
+uint8_t MOZ_ALWAYS_INLINE gfxPreMultiply(uint8_t c, uint8_t a) {
+    return GFX_DIVIDE_BY_255((c)*(a));
+}
+
+/**
+ * Pack the 4 8-bit channels (A,R,G,B)
+ * into a 32-bit packed NON-premultiplied pixel.
+ */
+uint32_t MOZ_ALWAYS_INLINE
+gfxPackedPixelNoPreMultiply(uint8_t a, uint8_t r, uint8_t g, uint8_t b) {
+    return (((a) << 24) | ((r) << 16) | ((g) << 8) | (b));
+}
+
+/**
+ * Pack the 4 8-bit channels (A,R,G,B)
+ * into a 32-bit packed premultiplied pixel.
+ */
+uint32_t MOZ_ALWAYS_INLINE
+gfxPackedPixel(uint8_t a, uint8_t r, uint8_t g, uint8_t b) {
+    if (a == 0x00)
+        return 0x00000000;
+    else if (a == 0xFF) {
+        return gfxPackedPixelNoPreMultiply(a, r, g, b);
+    } else {
+        return  ((a) << 24) |
+                (gfxPreMultiply(r,a) << 16) |
+                (gfxPreMultiply(g,a) << 8)  |
+                (gfxPreMultiply(b,a));
+    }
+}
+
+#endif /* _GFX_COLOR_H */
-- 
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