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Bug 1528881 - Part 3: gfx: Move FAST_DIVIDE_BY_255 macro definition to nsColor.cpp. r=jrmuizel

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FAST_DIVIDE_BY_255 was defined in nsColor.h but only used in nsColor.cpp.

Differential Revision: https://phabricator.services.mozilla.com/D20262

--HG--
extra : source : f41b6d89c97e28400d18226ac47d97f4d8772f6b
extra : intermediate-source : 6cc308158076ae86b6e7c5356ee71189ea9b883b
extra : histedit_source : b4de73d30ec2e86dbed261d6eb7c6d71473a78b1
This commit is contained in:
Chris Peterson 2018-08-21 22:04:13 -07:00
parent fe045e7d23
commit 1455d32b61
2 changed files with 12 additions and 12 deletions
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12
gfx/src/nsColor.cpp
View File

@ -206,6 +206,18 @@ bool NS_ColorNameToRGB(const nsAString& aColorName, nscolor* aResult) {
return false;
}
// Fast approximate division by 255. It has the property that
// for all 0 <= n <= 255*255, FAST_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 target=v/255
#define FAST_DIVIDE_BY_255(target, v) \
PR_BEGIN_MACRO \
unsigned tmp_ = v; \
target = ((tmp_ << 8) + tmp_ + 255) >> 16; \
PR_END_MACRO
// Macro to blend two colors
//
// equivalent to target = (bg*(255-fgalpha) + fg*fgalpha)/255

12
gfx/src/nsColor.h
View File

@ -48,18 +48,6 @@ inline uint8_t ClampColor(T aColor) {
} // namespace mozilla
// Fast approximate division by 255. It has the property that
// for all 0 <= n <= 255*255, FAST_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 target=v/255
#define FAST_DIVIDE_BY_255(target, v) \
PR_BEGIN_MACRO \
unsigned tmp_ = v; \
target = ((tmp_ << 8) + tmp_ + 255) >> 16; \
PR_END_MACRO
enum class nsHexColorType : uint8_t {
NoAlpha, // 3 or 6 digit hex colors only
AllowAlpha, // 3, 4, 6, or 8 digit hex colors