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Add a macro for querying the byte order of SkPMColor.

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R=reed@google.com

Author: bsalomon@google.com

Reviewed By: reed@google.com,epoger@google.com

Review URL: https://chromiumcodereview.appspot.com/12771010

git-svn-id: http://skia.googlecode.com/svn/trunk@8219 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
commit-bot@chromium.org 2013-03-19 14:16:31 +00:00
parent 14c3fc60b2
commit e4657ed7e1
2 changed files with 24 additions and 4 deletions
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22
include/core/SkPostConfig.h
View File

@ -187,6 +187,28 @@
#endif
#endif
/**
* SK_PMCOLOR_BYTE_ORDER can be used to query the byte order of SkPMColor at compile time. The
* relationship between the byte order and shift values depends on machine endianness. If the shift
* order is R=0, G=8, B=16, A=24 then ((char*)&pmcolor)[0] will produce the R channel on a little
* endian machine and the A channel on a big endian machine. Thus, given those shifts values,
* SK_PMCOLOR_BYTE_ORDER(R,G,B,A) will be true on a little endian machine and
* SK_PMCOLOR_BYTE_ORDER(A,B,G,R) will be true on a big endian machine.
*/
#ifdef SK_CPU_BENDIAN
#define SK_PMCOLOR_BYTE_ORDER(C0, C1, C2, C3) \
(SK_ ## C3 ## 32_SHIFT == 0 && \
SK_ ## C2 ## 32_SHIFT == 8 && \
SK_ ## C1 ## 32_SHIFT == 16 && \
SK_ ## C0 ## 32_SHIFT == 24)
#else
#define SK_PMCOLOR_BYTE_ORDER(C0, C1, C2, C3) \
(SK_ ## C0 ## 32_SHIFT == 0 && \
SK_ ## C1 ## 32_SHIFT == 8 && \
SK_ ## C2 ## 32_SHIFT == 16 && \
SK_ ## C3 ## 32_SHIFT == 24)
#endif
// stdlib macros
#if 0

6
include/gpu/GrTypes.h
View File

@ -291,11 +291,9 @@ enum GrPixelConfig {
#ifndef SK_CPU_LENDIAN
#error "Skia gpu currently assumes little endian"
#endif
#if 24 == SK_A32_SHIFT && 16 == SK_R32_SHIFT && \
8 == SK_G32_SHIFT && 0 == SK_B32_SHIFT
#if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
static const GrPixelConfig kSkia8888_GrPixelConfig = kBGRA_8888_GrPixelConfig;
#elif 24 == SK_A32_SHIFT && 16 == SK_B32_SHIFT && \
8 == SK_G32_SHIFT && 0 == SK_R32_SHIFT
#elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
static const GrPixelConfig kSkia8888_GrPixelConfig = kRGBA_8888_GrPixelConfig;
#else
#error "SK_*32_SHIFT values must correspond to GL_BGRA or GL_RGBA format."