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60 lines
1.1 KiB
C
60 lines
1.1 KiB
C
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#define GINT_NEED_VRAM
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#include <gint/defs/util.h>
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#include <gint/display.h>
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/* drect() - fill a rectangle of the screen */
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void drect(int x1, int y1, int x2, int y2, uint16_t color)
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{
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if(x1 > x2) swap(x1, x2);
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if(y1 > y2) swap(y1, y2);
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/* Order and bounds */
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if(x1 >= 396 || x2 < 0 || y1 >= 224 || y2 < 0) return;
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if(x1 < 0) x1 = 0;
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if(x2 >= 396) x2 = 395;
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if(y1 < 0) y1 = 0;
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if(y2 >= 224) y2 = 223;
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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 = vram + 396 * y1;
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int height = y2 - y1 + 1;
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/* Do borders first if there are at an odd position */
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if(x1 & 1)
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{
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uint16_t *v = base;
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for(int h = height; h; h--)
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{
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v[x1] = color;
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v += 396;
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}
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x1++;
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}
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if(x2 & 1) x2++;
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else
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{
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uint16_t *v = base;
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for(int h = height; h; h--)
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{
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v[x2] = color;
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v += 396;
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}
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}
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/* Now copy everything that's left as longwords */
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uint32_t *v = (void *)(base + x1);
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uint32_t op = (color << 16) | color;
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int width = (x2 - x1) >> 1;
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for(int h = height; h; h--)
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{
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for(int w = 0; w < width; w++) v[w] = op;
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v += 198;
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}
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}
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