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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file 32bpp_base.hpp Base for all 32 bits blitters. */
#ifndef BLITTER_32BPP_BASE_HPP
#define BLITTER_32BPP_BASE_HPP
#include "base.hpp"
#include "../core/bitmath_func.hpp"
#include "../core/math_func.hpp"
#include "../gfx_func.h"
/** Base for all 32bpp blitters. */
class Blitter_32bppBase : public Blitter {
public:
uint8 GetScreenDepth() override { return 32; }
void *MoveTo(void *video, int x, int y) override;
void SetPixel(void *video, int x, int y, uint8 colour) override;
void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash) override;
void DrawRect(void *video, int width, int height, uint8 colour) override;
void CopyFromBuffer(void *video, const void *src, int width, int height) override;
void CopyToBuffer(const void *video, void *dst, int width, int height) override;
void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) override;
void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) override;
int BufferSize(int width, int height) override;
void PaletteAnimate(const Palette &palette) override;
Blitter::PaletteAnimation UsePaletteAnimation() override;
int GetBytesPerPixel() override { return 4; }
/**
* Look up the colour in the current palette.
*/
static inline Colour LookupColourInPalette(uint index)
{
return _cur_palette.palette[index];
}
/**
* Compose a colour based on RGBA values and the current pixel value.
*/
static inline Colour ComposeColourRGBANoCheck(uint r, uint g, uint b, uint a, Colour current)
{
uint cr = current.r;
uint cg = current.g;
uint cb = current.b;
/* The 256 is wrong, it should be 255, but 256 is much faster... */
return Colour(
((int)(r - cr) * a) / 256 + cr,
((int)(g - cg) * a) / 256 + cg,
((int)(b - cb) * a) / 256 + cb);
}
/**
* Compose a colour based on RGBA values and the current pixel value.
* Handles fully transparent and solid pixels in a special (faster) way.
*/
static inline Colour ComposeColourRGBA(uint r, uint g, uint b, uint a, Colour current)
{
if (a == 0) return current;
if (a >= 255) return Colour(r, g, b);
return ComposeColourRGBANoCheck(r, g, b, a, current);
}
/**
* Compose a colour based on Pixel value, alpha value, and the current pixel value.
*/
static inline Colour ComposeColourPANoCheck(Colour colour, uint a, Colour current)
{
uint r = colour.r;
uint g = colour.g;
uint b = colour.b;
return ComposeColourRGBANoCheck(r, g, b, a, current);
}
/**
* Compose a colour based on Pixel value, alpha value, and the current pixel value.
* Handles fully transparent and solid pixels in a special (faster) way.
*/
static inline Colour ComposeColourPA(Colour colour, uint a, Colour current)
{
if (a == 0) return current;
if (a >= 255) {
colour.a = 255;
return colour;
}
return ComposeColourPANoCheck(colour, a, current);
}
/**
* Make a pixel looks like it is transparent.
* @param colour the colour already on the screen.
* @param nom the amount of transparency, nominator, makes colour lighter.
* @param denom denominator, makes colour darker.
* @return the new colour for the screen.
*/
static inline Colour MakeTransparent(Colour colour, uint nom, uint denom = 256)
{
uint r = colour.r;
uint g = colour.g;
uint b = colour.b;
return Colour(r * nom / denom, g * nom / denom, b * nom / denom);
}
/**
* Make a colour dark grey, for specialized 32bpp remapping.
* @param r red component
* @param g green component
* @param b blue component
* @return the brightness value of the new colour, now dark grey.
*/
static inline uint8 MakeDark(uint8 r, uint8 g, uint8 b)
{
/* Magic-numbers are ~66% of those used in MakeGrey() */
return ((r * 13063) + (g * 25647) + (b * 4981)) / 65536;
}
/**
* Make a colour dark grey, for specialized 32bpp remapping.
* @param colour the colour to make dark.
* @return the new colour, now darker.
*/
static inline Colour MakeDark(Colour colour)
{
uint8 d = MakeDark(colour.r, colour.g, colour.b);
return Colour(d, d, d);
}
/**
* Make a colour grey - based.
* @param colour the colour to make grey.
* @return the new colour, now grey.
*/
static inline Colour MakeGrey(Colour colour)
{
uint r = colour.r;
uint g = colour.g;
uint b = colour.b;
/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then
* divide by it to normalize the value to a byte again. See heightmap.cpp for
* information about the formula. */
uint grey = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536;
return Colour(grey, grey, grey);
}
static const int DEFAULT_BRIGHTNESS = 128;
static Colour ReallyAdjustBrightness(Colour colour, uint8 brightness);
static inline Colour AdjustBrightness(Colour colour, uint8 brightness)
{
/* Shortcut for normal brightness */
if (brightness == DEFAULT_BRIGHTNESS) return colour;
return ReallyAdjustBrightness(colour, brightness);
}
static inline uint8 GetColourBrightness(Colour colour)
{
uint8 rgb_max = std::max(colour.r, std::max(colour.g, colour.b));
/* Black pixel (8bpp or old 32bpp image), so use default value */
if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
return rgb_max;
}
};
#endif /* BLITTER_32BPP_BASE_HPP */
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