author | truelight |
Mon, 18 Jun 2007 20:08:21 +0000 | |
changeset 7447 | 2537a074be26 |
parent 7444 | 705a57aa0076 |
child 7454 | f86ba05c4969 |
permissions | -rw-r--r-- |
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#include "../stdafx.h" |
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#include "../gfx.h" |
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#include "8bpp_base.hpp" |
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void Blitter_8bppBase::DrawColorMappingRect(void *dst, int width, int height, int pal) |
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{ |
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const uint8 *ctab = GetNonSprite(pal) + 1; |
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do { |
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for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]]; |
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dst = (uint8 *)dst + _screen.pitch; |
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} while (height--); |
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} |
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void *Blitter_8bppBase::MoveTo(const void *video, int x, int y) |
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{ |
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return (uint8 *)video + x + y * _screen.pitch; |
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} |
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void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 color) |
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{ |
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*((uint8 *)video + x + y * _screen.pitch) = color; |
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} |
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void Blitter_8bppBase::SetPixelIfEmpty(void *video, int x, int y, uint8 color) |
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{ |
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uint8 *dst = (uint8 *)video + x + y * _screen.pitch; |
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if (*dst == 0) *dst = color; |
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} |
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void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 color) |
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{ |
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do { |
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memset(video, color, width); |
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video = (uint8 *)video + _screen.pitch; |
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} while (--height); |
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} |
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void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color) |
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{ |
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int dy; |
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int dx; |
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int stepx; |
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int stepy; |
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int frac; |
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dy = (y2 - y) * 2; |
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if (dy < 0) { |
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dy = -dy; |
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stepy = -1; |
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} else { |
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stepy = 1; |
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} |
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|
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dx = (x2 - x) * 2; |
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if (dx < 0) { |
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dx = -dx; |
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stepx = -1; |
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} else { |
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stepx = 1; |
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} |
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|
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this->SetPixel(video, x, y, color); |
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if (dx > dy) { |
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frac = dy - (dx / 2); |
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while (x != x2) { |
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if (frac >= 0) { |
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y += stepy; |
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frac -= dx; |
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} |
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x += stepx; |
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frac += dy; |
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if (x > 0 && y > 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color); |
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} |
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} else { |
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frac = dx - (dy / 2); |
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while (y != y2) { |
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if (frac >= 0) { |
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x += stepx; |
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frac -= dy; |
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} |
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y += stepy; |
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frac += dx; |
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if (x > 0 && y > 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color); |
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} |
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} |
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} |
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void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch) |
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{ |
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int direction = (height < 0) ? -1 : 1; |
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uint8 *dst = (uint8 *)video; |
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uint8 *usrc = (uint8 *)src; |
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|
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height = abs(height); |
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for (; height > 0; height--) { |
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memcpy(dst, usrc, width); |
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usrc += src_pitch * direction; |
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dst += _screen.pitch * direction; |
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} |
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} |
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|
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void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) |
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{ |
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int direction = (height < 0) ? -1 : 1; |
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uint8 *udst = (uint8 *)dst; |
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uint8 *src = (uint8 *)video; |
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height = abs(height); |
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for (; height > 0; height--) { |
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memcpy(udst, src, width); |
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src += _screen.pitch * direction; |
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udst += dst_pitch * direction; |
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} |
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} |
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void Blitter_8bppBase::MoveBuffer(void *video_dst, const void *video_src, int width, int height) |
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{ |
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uint8 *dst = (uint8 *)video_dst; |
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uint8 *src = (uint8 *)video_src; |
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121 |
|
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for (; height > 0; height--) { |
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memmove(dst, src, width); |
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src += _screen.pitch; |
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dst += _screen.pitch; |
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} |
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} |
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128 |
|
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void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) |
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{ |
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const uint8 *src; |
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uint8 *dst; |
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133 |
|
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if (scroll_y > 0) { |
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/*Calculate pointers */ |
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dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch; |
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src = dst - scroll_y * _screen.pitch; |
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138 |
|
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/* Decrease height and increase top */ |
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top += scroll_y; |
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height -= scroll_y; |
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assert(height > 0); |
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143 |
|
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/* Adjust left & width */ |
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if (scroll_x >= 0) { |
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dst += scroll_x; |
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left += scroll_x; |
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width -= scroll_x; |
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149 |
} else { |
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src -= scroll_x; |
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width += scroll_x; |
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152 |
} |
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153 |
|
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154 |
/* Negative height as we want to copy from bottom to top */ |
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this->CopyFromBuffer(dst, src, width, -height, _screen.pitch); |
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156 |
} else { |
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157 |
/* Calculate pointers */ |
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dst = (uint8 *)video + left + top * _screen.pitch; |
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src = dst - scroll_y * _screen.pitch; |
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160 |
|
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161 |
/* Decrese height. (scroll_y is <=0). */ |
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height += scroll_y; |
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assert(height > 0); |
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164 |
|
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165 |
/* Adjust left & width */ |
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166 |
if (scroll_x >= 0) { |
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dst += scroll_x; |
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168 |
left += scroll_x; |
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width -= scroll_x; |
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170 |
} else { |
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src -= scroll_x; |
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width += scroll_x; |
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173 |
} |
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174 |
|
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175 |
/* the y-displacement may be 0 therefore we have to use memmove, |
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176 |
* because source and destination may overlap */ |
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177 |
this->MoveBuffer(dst, src, width, height); |
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178 |
} |
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179 |
} |
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180 |
|
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int Blitter_8bppBase::BufferSize(int width, int height) |
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182 |
{ |
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return width * height; |
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184 |
} |