mirror of
https://github.com/vcmi/vcmi.git
synced 2024-12-24 22:14:36 +02:00
301 lines
8.2 KiB
C++
301 lines
8.2 KiB
C++
/*
|
|
* SDL_PixelAccess.h, part of VCMI engine
|
|
*
|
|
* Authors: listed in file AUTHORS in main folder
|
|
*
|
|
* License: GNU General Public License v2.0 or later
|
|
* Full text of license available in license.txt file, in main folder
|
|
*
|
|
*/
|
|
#pragma once
|
|
|
|
#include "SDL_Extensions.h"
|
|
|
|
#include <SDL_endian.h>
|
|
#include <SDL_pixels.h>
|
|
|
|
// for accessing channels from pixel in format-independent way
|
|
//should be as fast as accessing via pointer at least for 3-4 bytes per pixel
|
|
namespace Channels
|
|
{
|
|
// channel not present in this format
|
|
struct channel_empty
|
|
{
|
|
static STRONG_INLINE void set(uint8_t*, uint8_t) {}
|
|
static STRONG_INLINE uint8_t get(const uint8_t *) { return 255;}
|
|
};
|
|
|
|
// channel which uses whole pixel
|
|
template<int offset>
|
|
struct channel_pixel
|
|
{
|
|
static STRONG_INLINE void set(uint8_t *ptr, uint8_t value)
|
|
{
|
|
ptr[offset] = value;
|
|
}
|
|
|
|
static STRONG_INLINE uint8_t get(const uint8_t *ptr)
|
|
{
|
|
return ptr[offset];
|
|
}
|
|
};
|
|
|
|
// channel which uses part of pixel
|
|
template <int bits, int mask, int shift>
|
|
struct channel_subpx
|
|
{
|
|
|
|
static void STRONG_INLINE set(uint8_t *ptr, uint8_t value)
|
|
{
|
|
auto * const pixel = (uint16_t *)ptr;
|
|
uint8_t subpx = value >> (8 - bits);
|
|
*pixel = (*pixel & ~mask) | ((subpx << shift) & mask );
|
|
}
|
|
|
|
static uint8_t STRONG_INLINE get(const uint8_t *ptr)
|
|
{
|
|
uint8_t subpx = (*((uint16_t *)ptr) & mask) >> shift;
|
|
return (subpx << (8 - bits)) | (subpx >> (2*bits - 8));
|
|
}
|
|
};
|
|
|
|
template<int bpp>
|
|
struct px
|
|
{
|
|
static channel_empty r;
|
|
static channel_empty g;
|
|
static channel_empty b;
|
|
static channel_empty a;
|
|
};
|
|
|
|
#ifdef VCMI_ENDIAN_BIG
|
|
|
|
template<>
|
|
struct px<4>
|
|
{
|
|
static channel_pixel<1> r;
|
|
static channel_pixel<2> g;
|
|
static channel_pixel<3> b;
|
|
static channel_pixel<0> a;
|
|
};
|
|
|
|
template<>
|
|
struct px<3>
|
|
{
|
|
static channel_pixel<0> r;
|
|
static channel_pixel<1> g;
|
|
static channel_pixel<2> b;
|
|
static channel_empty a;
|
|
};
|
|
|
|
#else
|
|
|
|
template<>
|
|
struct px<4>
|
|
{
|
|
static channel_pixel<2> r;
|
|
static channel_pixel<1> g;
|
|
static channel_pixel<0> b;
|
|
static channel_pixel<3> a;
|
|
};
|
|
|
|
template<>
|
|
struct px<3>
|
|
{
|
|
static channel_pixel<2> r;
|
|
static channel_pixel<1> g;
|
|
static channel_pixel<0> b;
|
|
static channel_empty a;
|
|
};
|
|
|
|
#endif
|
|
|
|
template<>
|
|
struct px<2>
|
|
{
|
|
static channel_subpx<5, 0xF800, 11> r;
|
|
static channel_subpx<6, 0x07E0, 5 > g;
|
|
static channel_subpx<5, 0x001F, 0 > b;
|
|
static channel_empty a;
|
|
};
|
|
}
|
|
|
|
template<int bpp, int incrementPtr>
|
|
struct ColorPutter
|
|
{
|
|
static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B);
|
|
static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
|
|
static STRONG_INLINE void PutColorAlphaSwitch(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
|
|
static STRONG_INLINE void PutColor(uint8_t *&ptr, const SDL_Color & Color);
|
|
static STRONG_INLINE void PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color);
|
|
static STRONG_INLINE void PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count);
|
|
};
|
|
|
|
template <int incrementPtr>
|
|
struct ColorPutter<2, incrementPtr>
|
|
{
|
|
static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B);
|
|
static STRONG_INLINE void PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
|
|
static STRONG_INLINE void PutColorAlphaSwitch(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B, const uint8_t & A);
|
|
static STRONG_INLINE void PutColor(uint8_t *&ptr, const SDL_Color & Color);
|
|
static STRONG_INLINE void PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color);
|
|
static STRONG_INLINE void PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count);
|
|
};
|
|
|
|
template<int bpp, int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color)
|
|
{
|
|
PutColor(ptr, Color.r, Color.g, Color.b, Color.a);
|
|
}
|
|
|
|
template<int bpp, int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColor(uint8_t *&ptr, const SDL_Color & Color)
|
|
{
|
|
PutColor(ptr, Color.r, Color.g, Color.b);
|
|
}
|
|
|
|
template<int bpp, int incrementPtr>
|
|
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)
|
|
{
|
|
switch (A)
|
|
{
|
|
case 0:
|
|
ptr += bpp * incrementPtr;
|
|
return;
|
|
case 255:
|
|
PutColor(ptr, R, G, B);
|
|
return;
|
|
case 128: // optimized
|
|
PutColor(ptr,
|
|
((uint16_t)R + Channels::px<bpp>::r.get(ptr)) >> 1,
|
|
((uint16_t)G + Channels::px<bpp>::g.get(ptr)) >> 1,
|
|
((uint16_t)B + Channels::px<bpp>::b.get(ptr)) >> 1);
|
|
return;
|
|
default:
|
|
PutColor(ptr, R, G, B, A);
|
|
return;
|
|
}
|
|
}
|
|
|
|
template<int bpp, int incrementPtr>
|
|
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)
|
|
{
|
|
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),
|
|
((((uint32_t)G - (uint32_t)Channels::px<bpp>::g.get(ptr))*(uint32_t)A) >> 8 ) + (uint32_t)Channels::px<bpp>::g.get(ptr),
|
|
((((uint32_t)B - (uint32_t)Channels::px<bpp>::b.get(ptr))*(uint32_t)A) >> 8 ) + (uint32_t)Channels::px<bpp>::b.get(ptr));
|
|
}
|
|
|
|
|
|
template<int bpp, int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B)
|
|
{
|
|
static_assert(incrementPtr >= -1 && incrementPtr <= +1, "Invalid incrementPtr value!");
|
|
|
|
if (incrementPtr < 0)
|
|
ptr -= bpp;
|
|
|
|
Channels::px<bpp>::r.set(ptr, R);
|
|
Channels::px<bpp>::g.set(ptr, G);
|
|
Channels::px<bpp>::b.set(ptr, B);
|
|
Channels::px<bpp>::a.set(ptr, 255);
|
|
|
|
if (incrementPtr > 0)
|
|
ptr += bpp;
|
|
|
|
}
|
|
|
|
template<int bpp, int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<bpp, incrementPtr>::PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count)
|
|
{
|
|
if (count)
|
|
{
|
|
uint8_t *pixel = ptr;
|
|
PutColor(ptr, Color.r, Color.g, Color.b);
|
|
|
|
for (size_t i=0; i<count-1; i++)
|
|
{
|
|
memcpy(ptr, pixel, bpp);
|
|
ptr += bpp * incrementPtr;
|
|
}
|
|
}
|
|
}
|
|
|
|
template <int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColor(uint8_t *&ptr, const uint8_t & R, const uint8_t & G, const uint8_t & B)
|
|
{
|
|
if(incrementPtr == -1)
|
|
ptr -= 2;
|
|
|
|
auto * const px = (uint16_t *)ptr;
|
|
*px = (B>>3) + ((G>>2) << 5) + ((R>>3) << 11); //drop least significant bits of 24 bpp encoded color
|
|
|
|
if(incrementPtr == 1)
|
|
ptr += 2; //bpp
|
|
}
|
|
|
|
template <int incrementPtr>
|
|
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)
|
|
{
|
|
switch (A)
|
|
{
|
|
case 0:
|
|
ptr += 2 * incrementPtr;
|
|
return;
|
|
case 255:
|
|
PutColor(ptr, R, G, B);
|
|
return;
|
|
default:
|
|
PutColor(ptr, R, G, B, A);
|
|
return;
|
|
}
|
|
}
|
|
|
|
template <int incrementPtr>
|
|
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)
|
|
{
|
|
const int rbit = 5, gbit = 6, bbit = 5; //bits per color
|
|
const int rmask = 0xF800, gmask = 0x7E0, bmask = 0x1F;
|
|
const int rshift = 11, gshift = 5, bshift = 0;
|
|
|
|
const uint8_t r5 = (*((uint16_t *)ptr) & rmask) >> rshift,
|
|
b5 = (*((uint16_t *)ptr) & bmask) >> bshift,
|
|
g5 = (*((uint16_t *)ptr) & gmask) >> gshift;
|
|
|
|
const uint32_t r8 = (r5 << (8 - rbit)) | (r5 >> (2*rbit - 8)),
|
|
g8 = (g5 << (8 - gbit)) | (g5 >> (2*gbit - 8)),
|
|
b8 = (b5 << (8 - bbit)) | (b5 >> (2*bbit - 8));
|
|
|
|
PutColor(ptr,
|
|
(((R-r8)*A) >> 8) + r8,
|
|
(((G-g8)*A) >> 8) + g8,
|
|
(((B-b8)*A) >> 8) + b8);
|
|
}
|
|
|
|
template <int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColorAlpha(uint8_t *&ptr, const SDL_Color & Color)
|
|
{
|
|
PutColor(ptr, Color.r, Color.g, Color.b, Color.a);
|
|
}
|
|
|
|
template <int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColor(uint8_t *&ptr, const SDL_Color & Color)
|
|
{
|
|
PutColor(ptr, Color.r, Color.g, Color.b);
|
|
}
|
|
|
|
template <int incrementPtr>
|
|
STRONG_INLINE void ColorPutter<2, incrementPtr>::PutColorRow(uint8_t *&ptr, const SDL_Color & Color, size_t count)
|
|
{
|
|
//drop least significant bits of 24 bpp encoded color
|
|
uint16_t pixel = (Color.b>>3) + ((Color.g>>2) << 5) + ((Color.r>>3) << 11);
|
|
|
|
for (size_t i=0; i<count; i++)
|
|
{
|
|
memcpy(ptr, &pixel, 2);
|
|
if(incrementPtr == -1)
|
|
ptr -= 2;
|
|
if(incrementPtr == 1)
|
|
ptr += 2;
|
|
}
|
|
}
|