forked from Lephenixnoir/gint
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#include <gint/defs/util.h>
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#include <gint/display.h>
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void drect(int x1, int y1, int x2, int y2, int color)
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{
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if(color == C_NONE) return;
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if(x1 > x2) swap(x1, x2);
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if(y1 > y2) swap(y1, y2);
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/* Rectangle is completely outside the rendering window */
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if(x1 >= dwindow.right || x2 < dwindow.left) return;
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if(y1 >= dwindow.bottom || y2 < dwindow.top) return;
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/* Clipping */
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x1 = max(x1, dwindow.left);
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x2 = min(x2, dwindow.right - 1);
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y1 = max(y1, dwindow.top);
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y2 = min(y2, dwindow.bottom - 1);
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/* The method is exactly like dhline(). I first handle odd endpoints,
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then write longwords for the longest section */
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uint16_t *base = gint_vram + DWIDTH * y1;
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int height = y2 - y1 + 1;
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/* Now copy everything that's left as longwords */
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int ax1 = x1 + (x1 & 1);
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int ax2 = (x2 + 1) & ~1;
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uint32_t *v = (void *)(base + ax1);
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uint32_t op = (color << 16) | color;
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int width = (ax2 - ax1) >> 1;
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if(color == C_INVERT) for(int h = height; h; h--)
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{
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/* We can't double-draw on base[x1] and base[x2] here */
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if(x1 & 1) base[x1] ^= 0xffff;
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if(!(x2 & 1)) base[x2] ^= 0xffff;
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for(int w = 0; w < width; w++) v[w] ^= 0xffffffff;
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v += DWIDTH / 2;
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base += DWIDTH;
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}
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else for(int h = height; h; h--)
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{
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base[x1] = color;
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base[x2] = color;
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for(int w = 0; w < width; w++) v[w] = op;
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v += DWIDTH / 2;
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base += DWIDTH;
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}
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}
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