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FS-7506 improve anti-aliasing when use a NULL bgcolor for transparent text

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Seven Du 2015-05-12 09:18:12 +08:00 committed by Michael Jerris
parent 7077d9b148
commit f0b42410a3
1 changed files with 11 additions and 5 deletions
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16
src/switch_core_video.c
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@ -653,14 +653,13 @@ static void draw_bitmap(switch_img_txt_handle_t *handle, switch_image_t *img, FT
if (bitmap->width == 0) return;
switch_color_rgb2yuv(&handle->color, &yuv_color);
switch (bitmap->pixel_mode) {
case FT_PIXEL_MODE_GRAY: // it should always be GRAY since we use FT_LOAD_RENDER?
break;
case FT_PIXEL_MODE_NONE:
case FT_PIXEL_MODE_MONO:
{
switch_color_rgb2yuv(&handle->color, &yuv_color);
for ( j = y, q = 0; j < y_max; j++, q++ ) {
for ( i = x, p = 0; i < x_max; i++, p++ ) {
@ -693,9 +692,16 @@ static void draw_bitmap(switch_img_txt_handle_t *handle, switch_image_t *img, FT
if (handle->use_bgcolor) {
switch_img_draw_pixel(img, i, j, &handle->gradient_table[gradient * MAX_GRADIENT / 256]);
} else {
if (gradient > 128) {
switch_img_draw_pixel(img, i, j, &yuv_color);
}
switch_rgb_color_t rgb_color;
switch_rgb_color_t c;
switch_img_get_rgb_pixel(img, &rgb_color, i, j);
c.r = ((rgb_color.r * (255 - gradient)) >> 8) + ((handle->color.r * gradient) >> 8);
c.g = ((rgb_color.g * (255 - gradient)) >> 8) + ((handle->color.g * gradient) >> 8);
c.b = ((rgb_color.b * (255 - gradient)) >> 8) + ((handle->color.b * gradient) >> 8);
switch_color_rgb2yuv(&c, &yuv_color);
switch_img_draw_pixel(img, i, j, &yuv_color);
}
}
}