diff options
author | reed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2014-03-25 12:00:30 +0000 |
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committer | reed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2014-03-25 12:00:30 +0000 |
commit | 1121170477302e25ef2a020cf2092aa6b399b3ef (patch) | |
tree | 8202440265569ad57c1aa3238f643be66b25506d /include/core/SkColorPriv.h | |
parent | 9b62aa156bcf1db6f11af9302bf8bb8ef2567142 (diff) |
implement readPixels and writePixels natively, w/o using the (deprecated)
SkCanvas::Config8888 enum.
Revert "Revert "hide Config8888 entirely". Broke a bunch of builds."
This reverts commit 763277ba157fef0f651004bb98a189e9f1ac730b.
Needs chrome to remove the READPIXELS guard from skia's .gyp
Review URL: https://codereview.chromium.org/199733016
git-svn-id: http://skia.googlecode.com/svn/trunk@13931 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'include/core/SkColorPriv.h')
-rw-r--r-- | include/core/SkColorPriv.h | 140 |
1 files changed, 138 insertions, 2 deletions
diff --git a/include/core/SkColorPriv.h b/include/core/SkColorPriv.h index 7a74c4a034..9591f22725 100644 --- a/include/core/SkColorPriv.h +++ b/include/core/SkColorPriv.h @@ -1,4 +1,3 @@ - /* * Copyright 2006 The Android Open Source Project * @@ -6,7 +5,6 @@ * found in the LICENSE file. */ - #ifndef SkColorPriv_DEFINED #define SkColorPriv_DEFINED @@ -18,6 +16,134 @@ #include "SkColor.h" #include "SkMath.h" +////////////////////////////////////////////////////////////////////////////// + +#define SkASSERT_IS_BYTE(x) SkASSERT(0 == ((x) & ~0xFF)) + +/* + * Skia's 32bit backend only supports 1 sizzle order at a time (compile-time). + * This is specified by 4 defines SK_A32_SHIFT, SK_R32_SHIFT, ... for G and B. + * + * For easier compatibility with Skia's GPU backend, we further restrict these + * to either (in memory-byte-order) RGBA or BGRA. Note that this "order" does + * not directly correspond to the same shift-order, since we have to take endianess + * into account. + * + * Here we enforce this constraint. + */ + +#ifdef SK_CPU_BENDIAN + #define SK_RGBA_R32_SHIFT 24 + #define SK_RGBA_G32_SHIFT 16 + #define SK_RGBA_B32_SHIFT 8 + #define SK_RGBA_A32_SHIFT 0 + + #define SK_BGRA_B32_SHIFT 24 + #define SK_BGRA_G32_SHIFT 16 + #define SK_BGRA_R32_SHIFT 8 + #define SK_BGRA_A32_SHIFT 0 +#else + #define SK_RGBA_R32_SHIFT 0 + #define SK_RGBA_G32_SHIFT 8 + #define SK_RGBA_B32_SHIFT 16 + #define SK_RGBA_A32_SHIFT 24 + + #define SK_BGRA_B32_SHIFT 0 + #define SK_BGRA_G32_SHIFT 8 + #define SK_BGRA_R32_SHIFT 16 + #define SK_BGRA_A32_SHIFT 24 +#endif + +#if defined(SK_PMCOLOR_IS_RGBA) && defined(SK_PMCOLOR_IS_BGRA) + #error "can't define PMCOLOR to be RGBA and BGRA" +#endif + +#define LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_RGBA \ + (SK_A32_SHIFT == SK_RGBA_A32_SHIFT && \ + SK_R32_SHIFT == SK_RGBA_R32_SHIFT && \ + SK_G32_SHIFT == SK_RGBA_G32_SHIFT && \ + SK_B32_SHIFT == SK_RGBA_B32_SHIFT) + +#define LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_BGRA \ + (SK_A32_SHIFT == SK_BGRA_A32_SHIFT && \ + SK_R32_SHIFT == SK_BGRA_R32_SHIFT && \ + SK_G32_SHIFT == SK_BGRA_G32_SHIFT && \ + SK_B32_SHIFT == SK_BGRA_B32_SHIFT) + + +#if defined(SK_PMCOLOR_IS_RGBA) && !LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_RGBA + #error "SK_PMCOLOR_IS_RGBA does not match SK_*32_SHIFT values" +#endif + +#if defined(SK_PMCOLOR_IS_BGRA) && !LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_BGRA + #error "SK_PMCOLOR_IS_BGRA does not match SK_*32_SHIFT values" +#endif + +#if !defined(SK_PMCOLOR_IS_RGBA) && !defined(SK_PMCOLOR_IS_RGBA) + // deduce which to define from the _SHIFT defines + + #if LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_RGBA + #define SK_PMCOLOR_IS_RGBA + #elif LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_BGRA + #define SK_PMCOLOR_IS_BGRA + #else + #error "need 32bit packing to be either RGBA or BGRA" + #endif +#endif + +// hide these now that we're done +#undef LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_RGBA +#undef LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_BGRA + +////////////////////////////////////////////////////////////////////////////// + +// Reverse the bytes coorsponding to RED and BLUE in a packed pixels. Note the +// pair of them are in the same 2 slots in both RGBA and BGRA, thus there is +// no need to pass in the colortype to this function. +static inline uint32_t SkSwizzle_RB(uint32_t c) { + static const uint32_t kRBMask = (0xFF << SK_R32_SHIFT) | (0xFF << SK_B32_SHIFT); + + unsigned c0 = (c >> SK_R32_SHIFT) & 0xFF; + unsigned c1 = (c >> SK_B32_SHIFT) & 0xFF; + return (c & ~kRBMask) | (c0 << SK_B32_SHIFT) | (c1 << SK_R32_SHIFT); +} + +static inline uint32_t SkPackARGB_as_RGBA(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { + SkASSERT_IS_BYTE(a); + SkASSERT_IS_BYTE(r); + SkASSERT_IS_BYTE(g); + SkASSERT_IS_BYTE(b); + return (a << SK_RGBA_A32_SHIFT) | (r << SK_RGBA_R32_SHIFT) | + (g << SK_RGBA_G32_SHIFT) | (b << SK_RGBA_B32_SHIFT); +} + +static inline uint32_t SkPackARGB_as_BGRA(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { + SkASSERT_IS_BYTE(a); + SkASSERT_IS_BYTE(r); + SkASSERT_IS_BYTE(g); + SkASSERT_IS_BYTE(b); + return (a << SK_BGRA_A32_SHIFT) | (r << SK_BGRA_R32_SHIFT) | + (g << SK_BGRA_G32_SHIFT) | (b << SK_BGRA_B32_SHIFT); +} + +static inline SkPMColor SkSwizzle_RGBA_to_PMColor(uint32_t c) { +#ifdef SK_PMCOLOR_IS_RGBA + return c; +#else + return SkSwizzle_RB(c); +#endif +} + +static inline SkPMColor SkSwizzle_BGRA_to_PMColor(uint32_t c) { +#ifdef SK_PMCOLOR_IS_BGRA + return c; +#else + return SkSwizzle_RB(c); +#endif +} + +////////////////////////////////////////////////////////////////////////////// + ///@{ /** See ITU-R Recommendation BT.709 at http://www.itu.int/rec/R-REC-BT.709/ .*/ #define SK_ITU_BT709_LUM_COEFF_R (0.2126f) @@ -239,6 +365,16 @@ static inline SkPMColor SkPackARGB32(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { (g << SK_G32_SHIFT) | (b << SK_B32_SHIFT); } +static inline uint32_t SkPackPMColor_as_RGBA(SkPMColor c) { + return SkPackARGB_as_RGBA(SkGetPackedA32(c), SkGetPackedR32(c), + SkGetPackedG32(c), SkGetPackedB32(c)); +} + +static inline uint32_t SkPackPMColor_as_BGRA(SkPMColor c) { + return SkPackARGB_as_BGRA(SkGetPackedA32(c), SkGetPackedR32(c), + SkGetPackedG32(c), SkGetPackedB32(c)); +} + /** * Abstract 4-byte interpolation, implemented on top of SkPMColor * utility functions. Third parameter controls blending of the first two: |