Fix pixel converage calculation in subpixel LCD pixfmt buffer - gsl-shell.git - gsl-shell

diff --git a/agg-plot/agg_pixfmt_rgb24_lcd.h b/agg-plot/agg_pixfmt_rgb24_lcd.h
index c7dbbffe..39fbe8c6 100644
--- a/agg-plot/agg_pixfmt_rgb24_lcd.h
+++ b/agg-plot/agg_pixfmt_rgb24_lcd.h

@@ -27,6 +27,7 @@

#include <string.h>

#include <stdlib.h>

+#include <stdio.h>

#include "agg_basics.h"

#include "agg_color_rgba.h"

@@ -138,18 +139,10 @@ namespace agg

for (/* */; cx <= cx_max; cx++)

{

- int alpha = m_lut->convolution(covers, cx, 0, len - 1) * c.a;

- if (alpha)

- {

- if (alpha == 255*255)

- {

- *p = (int8u)rgb[i];

- }

- else

- {

- *p = (int8u)((((rgb[i] - *p) * alpha) + (*p << 16)) >> 16);

- }

- }

+ unsigned c_conv = m_lut->convolution(covers, cx, 0, len - 1);

+ unsigned alpha = (c_conv + 1) * (c.a + 1);

+ unsigned dst_col = rgb[i], src_col = (*p);

+ *p = (int8u)((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);

p ++;

i = (i + 1) % 3;