mirror of
https://github.com/vcmi/vcmi.git
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301 lines
8.2 KiB
C++
301 lines
8.2 KiB
C++
/*
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* SDL_PixelAccess.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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#include "SDL_Extensions.h"
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#include <SDL_endian.h>
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#include <SDL_pixels.h>
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// for accessing channels from pixel in format-independent way
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//should be as fast as accessing via pointer at least for 3-4 bytes per pixel
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namespace Channels
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{
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// channel not present in this format
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struct channel_empty
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{
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static STRONG_INLINE void set(uint8_t*, uint8_t) {}
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static STRONG_INLINE uint8_t get(const uint8_t *) { return 255;}
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};
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// channel which uses whole pixel
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template<int offset>
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struct channel_pixel
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{
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static STRONG_INLINE void set(uint8_t *ptr, uint8_t value)
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{
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ptr[offset] = value;
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}
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static STRONG_INLINE uint8_t get(const uint8_t *ptr)
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{
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return ptr[offset];
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}
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};
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// channel which uses part of pixel
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template <int bits, int mask, int shift>
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struct channel_subpx
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{
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static void STRONG_INLINE set(uint8_t *ptr, uint8_t value)
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{
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auto * const pixel = (uint16_t *)ptr;
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uint8_t subpx = value >> (8 - bits);
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*pixel = (*pixel & ~mask) | ((subpx << shift) & mask );
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}
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static uint8_t STRONG_INLINE get(const uint8_t *ptr)
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{
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uint8_t subpx = (*((uint16_t *)ptr) & mask) >> shift;
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return (subpx << (8 - bits)) | (subpx >> (2*bits - 8));
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}
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};
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template<int bpp>
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struct px
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{
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static channel_empty r;
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static channel_empty g;
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static channel_empty b;
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static channel_empty a;
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};
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#ifdef VCMI_ENDIAN_BIG
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template<>
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struct px<4>
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{
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static channel_pixel<1> r;
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static channel_pixel<2> g;
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static channel_pixel<3> b;
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static channel_pixel<0> a;
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};
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template<>
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struct px<3>
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{
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static channel_pixel<0> r;
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static channel_pixel<1> g;
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static channel_pixel<2> b;
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static channel_empty a;
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};
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#else
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template<>
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struct px<4>
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{
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static channel_pixel<2> r;
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static channel_pixel<1> g;
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static channel_pixel<0> b;
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static channel_pixel<3> a;
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};
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template<>
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struct px<3>
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{
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static channel_pixel<2> r;
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static channel_pixel<1> g;
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static channel_pixel<0> b;
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static channel_empty a;
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};
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#endif
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template<>
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struct px<2>
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{
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static channel_subpx<5, 0xF800, 11> r;
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static channel_subpx<6, 0x07E0, 5 > g;
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static channel_subpx<5, 0x001F, 0 > b;
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static channel_empty a;
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};
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}
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template<int bpp, int incrementPtr>
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struct ColorPutter
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{
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static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B);
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static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
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static STRONG_INLINE void PutColorAlphaSwitch(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
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static STRONG_INLINE void PutColor(uint8_t *&ptr, const SDL_Color & Color);
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static STRONG_INLINE void PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color);
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static STRONG_INLINE void PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count);
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};
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template <int incrementPtr>
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struct ColorPutter<2, incrementPtr>
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{
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static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B);
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static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
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static STRONG_INLINE void PutColorAlphaSwitch(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
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static STRONG_INLINE void PutColor(uint8_t *&ptr, const SDL_Color & Color);
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static STRONG_INLINE void PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color);
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static STRONG_INLINE void PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count);
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};
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template<int bpp, int incrementPtr>
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STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color)
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{
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PutColor(ptr, Color.r, Color.g, Color.b, Color.a);
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}
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template<int bpp, int incrementPtr>
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STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColor(uint8_t *&ptr, const SDL_Color & Color)
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{
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PutColor(ptr, Color.r, Color.g, Color.b);
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}
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template<int bpp, int incrementPtr>
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STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColorAlphaSwitch(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A)
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{
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switch (A)
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{
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case 0:
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ptr += bpp * incrementPtr;
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return;
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case 255:
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PutColor(ptr, R, G, B);
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return;
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case 128: // optimized
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PutColor(ptr,
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((uint16_t)R + Channels::px<bpp>::r.get(ptr)) >> 1,
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((uint16_t)G + Channels::px<bpp>::g.get(ptr)) >> 1,
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((uint16_t)B + Channels::px<bpp>::b.get(ptr)) >> 1);
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return;
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default:
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PutColor(ptr, R, G, B, A);
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return;
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}
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}
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template<int bpp, int incrementPtr>
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STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A)
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{
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PutColor(ptr, ((((uint32_t)R - (uint32_t)Channels::px<bpp>::r.get(ptr))*(uint32_t)A) >> 8 ) + (uint32_t)Channels::px<bpp>::r.get(ptr),
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((((uint32_t)G - (uint32_t)Channels::px<bpp>::g.get(ptr))*(uint32_t)A) >> 8 ) + (uint32_t)Channels::px<bpp>::g.get(ptr),
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((((uint32_t)B - (uint32_t)Channels::px<bpp>::b.get(ptr))*(uint32_t)A) >> 8 ) + (uint32_t)Channels::px<bpp>::b.get(ptr));
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}
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template<int bpp, int incrementPtr>
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STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B)
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{
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static_assert(incrementPtr >= -1 && incrementPtr <= +1, "Invalid incrementPtr value!");
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if (incrementPtr < 0)
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ptr -= bpp;
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Channels::px<bpp>::r.set(ptr, R);
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Channels::px<bpp>::g.set(ptr, G);
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Channels::px<bpp>::b.set(ptr, B);
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Channels::px<bpp>::a.set(ptr, 255);
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if (incrementPtr > 0)
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ptr += bpp;
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}
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template<int bpp, int incrementPtr>
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STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count)
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{
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if (count)
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{
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uint8_t *pixel = ptr;
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PutColor(ptr, Color.r, Color.g, Color.b);
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for (size_t i=0; i<count-1; i++)
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{
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memcpy(ptr, pixel, bpp);
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ptr += bpp * incrementPtr;
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}
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}
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}
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template <int incrementPtr>
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STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B)
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{
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if(incrementPtr == -1)
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ptr -= 2;
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auto * const px = (uint16_t *)ptr;
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*px = (B>>3) + ((G>>2) << 5) + ((R>>3) << 11); //drop least significant bits of 24 bpp encoded color
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if(incrementPtr == 1)
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ptr += 2; //bpp
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}
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template <int incrementPtr>
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STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColorAlphaSwitch(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A)
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{
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switch (A)
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{
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case 0:
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ptr += 2 * incrementPtr;
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return;
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case 255:
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PutColor(ptr, R, G, B);
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return;
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default:
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PutColor(ptr, R, G, B, A);
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return;
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}
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}
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template <int incrementPtr>
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STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A)
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{
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const int rbit = 5, gbit = 6, bbit = 5; //bits per color
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const int rmask = 0xF800, gmask = 0x7E0, bmask = 0x1F;
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const int rshift = 11, gshift = 5, bshift = 0;
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const uint8_t r5 = (*((uint16_t *)ptr) & rmask) >> rshift,
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b5 = (*((uint16_t *)ptr) & bmask) >> bshift,
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g5 = (*((uint16_t *)ptr) & gmask) >> gshift;
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const uint32_t r8 = (r5 << (8 - rbit)) | (r5 >> (2*rbit - 8)),
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g8 = (g5 << (8 - gbit)) | (g5 >> (2*gbit - 8)),
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b8 = (b5 << (8 - bbit)) | (b5 >> (2*bbit - 8));
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PutColor(ptr,
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(((R-r8)*A) >> 8) + r8,
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(((G-g8)*A) >> 8) + g8,
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(((B-b8)*A) >> 8) + b8);
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}
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template <int incrementPtr>
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STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color)
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{
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PutColor(ptr, Color.r, Color.g, Color.b, Color.a);
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}
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template <int incrementPtr>
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STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColor(uint8_t *&ptr, const SDL_Color & Color)
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{
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PutColor(ptr, Color.r, Color.g, Color.b);
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}
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template <int incrementPtr>
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STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count)
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{
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//drop least significant bits of 24 bpp encoded color
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uint16_t pixel = (Color.b>>3) + ((Color.g>>2) << 5) + ((Color.r>>3) << 11);
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for (size_t i=0; i<count; i++)
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{
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memcpy(ptr, &pixel, 2);
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if(incrementPtr == -1)
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ptr -= 2;
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if(incrementPtr == 1)
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ptr += 2;
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}
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}
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