52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
#include <vhex/display.h>
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#include <vhex/defs/util.h>
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#include <vhex/defs/types.h>
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/* Vhex vram */
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extern uint16_t vhex_vram[];
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/* dhline(): Optimized horizontal line */
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void dhline(int x1, int x2, int y, int color)
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{
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/* Order and bounds */
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if((uint)y >= 224) return;
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if(x1 > x2) swap(x1, x2);
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if(x1 >= 396 || x2 < 0) return;
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if(x1 < 0) x1 = 0;
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if(x2 >= 396) x2 = 395;
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int offset = 396 * y;
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/* Use longwords to do the copy, but first paint the endpoints to heed
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for odd x1 and x2. Checking the parity may be a waste of time. */
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vhex_vram[offset + x1] = color;
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vhex_vram[offset + x2] = color;
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/* Now round to longword boundaries and copy everything in-between with
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longwords */
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x1 = x1 + (x1 & 1);
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x2 = (x2 + 1) & ~1;
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uint32_t *start = (void *)(vhex_vram + offset + x1);
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uint32_t *end = (void *)(vhex_vram + offset + x2);
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uint32_t op = (color << 16) | color;
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while(end > start) *--end = op;
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}
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/* dvline(): Optimized vertical line */
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void dvline(int y1, int y2, int x, int color)
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{
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/* Order and bounds */
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if((uint)x >= 396) return;
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if(y1 > y2) swap(y1, y2);
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if(y1 < 0) y1 = 0;
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if(y2 >= 224) y2 = 223;
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uint16_t *v = vhex_vram + 396 * y1 + x;
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int height = y2 - y1 + 1;
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while(height-- > 0) *v = color, v += 396;
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}
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