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Diffstat (limited to 'gfx/skia/skia/src/core/SkOpts.h')
-rw-r--r-- | gfx/skia/skia/src/core/SkOpts.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/core/SkOpts.h b/gfx/skia/skia/src/core/SkOpts.h new file mode 100644 index 0000000000..4df2a4f98c --- /dev/null +++ b/gfx/skia/skia/src/core/SkOpts.h @@ -0,0 +1,139 @@ +/* + * Copyright 2015 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#ifndef SkOpts_DEFINED +#define SkOpts_DEFINED + +#include "include/core/SkTypes.h" +#include "include/private/SkOpts_spi.h" +#include "src/core/SkRasterPipelineOpList.h" +#include "src/core/SkXfermodePriv.h" + +/** + * SkOpts (short for SkOptimizations) is a mechanism where we can ship with multiple implementations + * of a set of functions and dynamically choose the best one at runtime (e.g. the call to + * SkGraphics::Init(), which calls SkOpts::Init()) depending on the detected CPU features. This is + * also referred to as having "specializations" of a given function. + * + * For example, Skia might be compiled to support CPUs that only have the sse2 instruction set + * (https://en.wikipedia.org/wiki/X86_instruction_listings#SSE2_instructions) + * but may be run on a more modern CPU that supports sse42 instructions. + * (https://en.wikipedia.org/wiki/SSE4) + * SkOpts allow Skia to have two versions of a CRC32 checksum function, one that uses normal C++ + * code (e.g. loops, bit operations, table lookups) and one that makes use of the _mm_crc32_u64 + * intrinsic function which uses the SSE4.2 crc32 machine instruction under the hood. This hash + * function is declared here in the SkOpts namespace, and then the implementation (see SkOpts.cpp) + * is deferred to a function of the same name in the sse2:: namespace (the minimum Skia is compiled + * with) using DEFINE_DEFAULT. + * + * All implementations of this hash function are done in a header file file in //src/opts + * (e.g. //src/opts/SkChecksum_opts.h). ifdefs guard each of the implementations, such that only + * one implementation is possible for a given SK_CPU_SSE_LEVEL. This header will be compiled + * *multiple* times with a different SK_CPU_SSE_LEVEL each compilation. + * + * Each CPU instruction set that we want specializations for has a .cpp file in //src/opts which + * defines an Init() function that replaces the function pointers in the SkOpts namespace with the + * ones from the specialized namespace (e.g. sse42::). These .cpp files don't implement the + * specializations, they just refer to the specialization created in the header files (e.g. + * SkChecksum_opts.h). + * + * At compile time: + * - SkOpts.cpp is compiled with the minimum CPU level (e.g. SSE2). Because this + * file includes all the headers in //src/opts/, those headers add "the default implementation" + * of all their functions to the SK_OPTS_NS namespace (e.g. sse2::hash_fn). + * - Each of the specialized .cpp files in //src/opts/ are compiled with their respective + * compiler flags. Because the specialized .cpp file includes the headers that implement the + * functions using intrinsics or other CPU-specific code, those specialized functions end up + * in the specialized namespace, e.g. (sse42::hash_fn). + * + * At link time, the default implementations and all specializations of all SkOpts functions are + * included in the resulting library/binary file. + * + * At runtime, SkOpts::Init() will run the appropriate Init functions that the current CPU level + * supports specializations for (e.g. Init_sse42, Init_ssse3). Note multiple Init functions can + * be called as CPU instruction sets are typically super sets of older instruction sets + */ + +struct SkBitmapProcState; +struct SkRasterPipelineStage; +namespace skvm { +struct InterpreterInstruction; +} +namespace SkSL { +class TraceHook; +} + +namespace SkOpts { + // Call to replace pointers to portable functions with pointers to CPU-specific functions. + // Thread-safe and idempotent. + // Called by SkGraphics::Init(). + void Init(); + + // Declare function pointers here... + + // May return nullptr if we haven't specialized the given Mode. + extern SkXfermode* (*create_xfermode)(SkBlendMode); + + extern void (*blit_mask_d32_a8)(SkPMColor*, size_t, const SkAlpha*, size_t, SkColor, int, int); + extern void (*blit_row_color32)(SkPMColor*, const SkPMColor*, int, SkPMColor); + extern void (*blit_row_s32a_opaque)(SkPMColor*, const SkPMColor*, int, U8CPU); + + // Swizzle input into some sort of 8888 pixel, {premul,unpremul} x {rgba,bgra}. + typedef void (*Swizzle_8888_u32)(uint32_t*, const uint32_t*, int); + extern Swizzle_8888_u32 RGBA_to_BGRA, // i.e. just swap RB + RGBA_to_rgbA, // i.e. just premultiply + RGBA_to_bgrA, // i.e. swap RB and premultiply + inverted_CMYK_to_RGB1, // i.e. convert color space + inverted_CMYK_to_BGR1; // i.e. convert color space + + typedef void (*Swizzle_8888_u8)(uint32_t*, const uint8_t*, int); + extern Swizzle_8888_u8 RGB_to_RGB1, // i.e. insert an opaque alpha + RGB_to_BGR1, // i.e. swap RB and insert an opaque alpha + gray_to_RGB1, // i.e. expand to color channels + an opaque alpha + grayA_to_RGBA, // i.e. expand to color channels + grayA_to_rgbA; // i.e. expand to color channels and premultiply + + extern void (*memset16)(uint16_t[], uint16_t, int); + extern void (*memset32)(uint32_t[], uint32_t, int); + extern void (*memset64)(uint64_t[], uint64_t, int); + + extern void (*rect_memset16)(uint16_t[], uint16_t, int, size_t, int); + extern void (*rect_memset32)(uint32_t[], uint32_t, int, size_t, int); + extern void (*rect_memset64)(uint64_t[], uint64_t, int, size_t, int); + + extern float (*cubic_solver)(float, float, float, float); + + static inline uint32_t hash(const void* data, size_t bytes, uint32_t seed=0) { + // hash_fn is defined in SkOpts_spi.h so it can be used by //modules + return hash_fn(data, bytes, seed); + } + + // SkBitmapProcState optimized Shader, Sample, or Matrix procs. + extern void (*S32_alpha_D32_filter_DX)(const SkBitmapProcState&, + const uint32_t* xy, int count, SkPMColor*); + extern void (*S32_alpha_D32_filter_DXDY)(const SkBitmapProcState&, + const uint32_t* xy, int count, SkPMColor*); + + // We can't necessarily express the type of SkRasterPipeline stage functions here, + // so we just use this void(*)(void) as a stand-in. + using StageFn = void(*)(void); + extern StageFn ops_highp[kNumRasterPipelineHighpOps], just_return_highp; + extern StageFn ops_lowp [kNumRasterPipelineLowpOps ], just_return_lowp; + + extern void (*start_pipeline_highp)(size_t,size_t,size_t,size_t, SkRasterPipelineStage*); + extern void (*start_pipeline_lowp )(size_t,size_t,size_t,size_t, SkRasterPipelineStage*); + + extern size_t raster_pipeline_lowp_stride; + extern size_t raster_pipeline_highp_stride; + + extern void (*interpret_skvm)(const skvm::InterpreterInstruction insts[], int ninsts, + int nregs, int loop, const int strides[], + SkSL::TraceHook* traceHooks[], int nTraceHooks, + int nargs, int n, void* args[]); +} // namespace SkOpts + +#endif // SkOpts_DEFINED |