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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /gfx/thebes/gfxColor.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/thebes/gfxColor.h')
-rw-r--r-- | gfx/thebes/gfxColor.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/gfx/thebes/gfxColor.h b/gfx/thebes/gfxColor.h new file mode 100644 index 0000000000..eec2b0b70e --- /dev/null +++ b/gfx/thebes/gfxColor.h @@ -0,0 +1,62 @@ +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * 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/gfx/Types.h" // for mozilla::gfx::SurfaceFormatBit + +/** + * 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) << mozilla::gfx::SurfaceFormatBit::OS_A) | + ((r) << mozilla::gfx::SurfaceFormatBit::OS_R) | + ((g) << mozilla::gfx::SurfaceFormatBit::OS_G) | + ((b) << mozilla::gfx::SurfaceFormatBit::OS_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) << mozilla::gfx::SurfaceFormatBit::OS_A) | + (gfxPreMultiply(r, a) << mozilla::gfx::SurfaceFormatBit::OS_R) | + (gfxPreMultiply(g, a) << mozilla::gfx::SurfaceFormatBit::OS_G) | + (gfxPreMultiply(b, a) << mozilla::gfx::SurfaceFormatBit::OS_B); + } +} + +#endif /* _GFX_COLOR_H */ |