FGFS-4.1/simgear
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Add support for contrast.

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This commit is contained in:
ehofman 2005-01-14 15:52:56 +00:00
parent 1e24cc4643
commit e2e7466250
1 changed files with 14 additions and 2 deletions
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14
simgear/screen/texture.cxx
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@ -19,6 +19,7 @@
#include SG_GLU_H
#include <math.h>
#include <zlib.h>
#include "texture.hxx"
@ -806,6 +807,11 @@ SGTexture::make_monochrome(float contrast, GLubyte r, GLubyte g, GLubyte b) {
GLubyte *rgb = get_pixel(x,y);
GLubyte avg = (rgb[0] + rgb[1] + rgb[2]) / 3;
if (contrast != 1.0) {
float pixcol = -1.0 + (avg/128);
avg = 128 + 128*powf(pixcol, contrast);
}
ap[0] = avg*r/255;
ap[1] = avg*g/255;
ap[2] = avg*b/255;
@ -817,16 +823,22 @@ SGTexture::make_monochrome(float contrast, GLubyte r, GLubyte g, GLubyte b) {
void
SGTexture::make_grayscale(float contrast) {
if (num_colors >= 3)
if (num_colors < 3)
return;
GLubyte *map = (GLubyte *)malloc (texture_width * texture_height);
for (int y=0; y<texture_height; y++)
for (int x=0; x<texture_width; x++)
{
GLubyte *rgb = get_pixel(x,y);
GLubyte avg = (rgb[0] + rgb[1] + rgb[2]) / 3;
if (contrast != 1.0) {
float pixcol = -1.0 + (avg/128);
avg = 128 + 128*powf(pixcol, contrast);
}
map[x + y*texture_height] = avg;
}