61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
#include <vhex/display.h>
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#include <vhex/defs/attributes.h>
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#include <vhex/defs/types.h>
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//---
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// Kernel-level API
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//---
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/* dpixel_render() : drawing algorithm */
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void dpixel_render(dsurface_t *surface, int x, int y, int color)
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{
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if (color == C_NONE)
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return;
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/* check point culling */
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if (y < surface->y1
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|| x < surface->x1
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|| y > surface->y2
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|| x > surface->x2) {
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return;
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}
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/* calculate the draw index */
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int real_y = (y - surface->y1) * surface->width;
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int real_x = (x - surface->x1);
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int draw_idx = real_y + real_x;
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/* handle special color */
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uint16_t *vram = surface->vram;
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if (color == C_INVERT)
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color = vram[draw_idx] ^ 0xffff;
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/* set the pixel */
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vram[draw_idx] = color;
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}
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//---
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// Dstack-level API
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//---
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/* dpixel_render_dstack() : dstack-API compatible render */
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void dpixel_dstack(dsurface_t *surface, uint32_t *arg)
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{
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dpixel_render(surface, arg[0], arg[1], arg[2]);
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}
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//---
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// User-level API
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//---
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/* dpixel() : draw a pixel in screen */
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void dpixel(int x, int y, int color)
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{
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dstack_add_action(
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DSTACK_CALL(&dpixel_dstack, x, y, color),
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NULL,
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NULL
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);
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}
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