49 lines
690 B
C
49 lines
690 B
C
typedef struct _RenderInfo RenderInfo;
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struct _RenderInfo
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{
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int y;
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float scaley;
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int src_y;
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};
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static void bar(void) { }
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static int
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render_image_rgb_a (RenderInfo * info)
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{
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int y, ye;
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float error;
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float step;
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y = info->y;
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ye = 256;
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step = 1.0 / info->scaley;
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error = y * step;
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error -= ((int) error) - step;
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for (; y < ye; y++) {
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if (error >= 1.0) {
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info->src_y += (int) error;
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error -= (int) error;
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bar();
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}
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error += step;
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}
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return info->src_y;
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}
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int main (void)
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{
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RenderInfo info;
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info.y = 0;
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info.src_y = 0;
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info.scaley = 1.0;
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if (render_image_rgb_a(&info) != 256)
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abort ();
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exit(0);
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}
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