notgne2/tuxpaint-pencil-sharpener
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Copied external code into mosaic.c

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This commit is contained in:
Andrew Corcoran 2008-07-19 18:54:56 +00:00
parent 4c71ecdba1
commit 9e1a97efd5
1 changed files with 109 additions and 9 deletions
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118
magic/src/mosaic.c
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@ -37,9 +37,10 @@
#include <math.h>
#include <limits.h>
#include <time.h>
#include "noise.c"
#include "sharpen.c"
#include "blur.c"
//#include "noise.c"
//#include "sharpen.c"
//#include "blur.c"
#ifndef gettext_noop
#define gettext_noop(String) String
@ -81,8 +82,6 @@ int mosaic_init(magic_api * api){
snprintf(fname, sizeof(fname), "%s/sounds/magic/%s", api->data_directory, mosaic_snd_filenames[i]);
mosaic_snd_effect[i] = Mix_LoadWAV(fname);
}
sharpen_init(api);
return(1);
}
@ -108,6 +107,108 @@ char * mosaic_get_description(magic_api * api, int which){
return(strdup(gettext(mosaic_descs[which])));
}
//Do the effect for one pixel
static void mosaic_do_noise_pixel(void * ptr, int which,
SDL_Surface * canvas, SDL_Surface * last,
int x, int y){
magic_api * api = (magic_api *) ptr;
Uint8 temp[3];
double temp2[3];
const int noise_AMOUNT = 100.0;
SDL_GetRGB(api->getpixel(canvas,x, y), canvas->format, &temp[0], &temp[1], &temp[2]);
int k;
for (k =0;k<3;k++){
temp2[k] = clamp(0.0, (int)temp[k] - (rand()%noise_AMOUNT) + noise_AMOUNT/2.0, 255.0);
}
api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, temp2[0], temp2[1], temp2[2]));
}
//Do the effect for one pixel
static void mosaic_do_blur_pixel(void * ptr, int which,
SDL_Surface * canvas, SDL_Surface * last,
int x, int y){
magic_api * api = (magic_api *) ptr;
int i,j,k;
Uint8 temp[3];
double blurValue[3];
for (k =0;k<3;k++){
blurValue[k] = 0;
}
//5x5 gaussiann weighting window
const int weight[5][5] = { {1,4,7,4,1},
{4,16,26,16,4},
{7,26,41,26,7},
{4,16,26,16,4},
{1,4,7,4,1}};
for (i=-2;i<3;i++){
for (j=-2;j<3;j++){
//Add the pixels around the current one wieghted
SDL_GetRGB(api->getpixel(canvas, x + i, y + j), canvas->format, &temp[0], &temp[1], &temp[2]);
for (k =0;k<3;k++){
blurValue[k] += temp[k]* weight[i+2][j+2];
}
}
}
for (k =0;k<3;k++){
blurValue[k] /= 273;
}
api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, blurValue[0], blurValue[1], blurValue[2]));
}
//Calculates the grey scale value for a rgb pixel
static int mosaic_grey(Uint8 r1,Uint8 g1,Uint8 b1){
return 0.3*r1+.59*g1+0.11*b1;
}
// Do the effect:
static void mosaic_do_sharpen_pixel(void * ptr, int which,
SDL_Surface * canvas, SDL_Surface * last,
int x, int y){
magic_api * api = (magic_api *) ptr;
Uint8 r1, g1, b1;
int grey;
int i,j;
double sobel_1=0,sobel_2=0;
const double SHARPEN = 0.5;
//Sobel weighting masks
const int sobel_weights_1[3][3] = { {1,2,1},
{0,0,0},
{-1,-2,-1}};
const int sobel_weights_2[3][3] = { {-1,0,1},
{-2,0,2},
{-1,0,1}};
sobel_1=0;
sobel_2=0;
for (i=-1;i<2;i++){
for(j=-1; j<2; j++){
//No need to check if inside canvas, getpixel does it for us.
SDL_GetRGB(api->getpixel(canvas, x+i, y+j), canvas->format, &r1, &g1, &b1);
grey = mosaic_grey(r1,g1,b1);
sobel_1 += grey * sobel_weights_1[i+1][j+1];
sobel_2 += grey * sobel_weights_2[i+1][j+1];
}
}
double temp = sqrt(sobel_1*sobel_1 + sobel_2*sobel_2);
temp = (temp/1443)*255.0;
SDL_GetRGB(api->getpixel(canvas, x, y), canvas->format, &r1, &g1, &b1);
api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, clamp(0.0, r1 + SHARPEN * temp, 255.0),
clamp(0.0, g1 + SHARPEN * temp, 255.0),
clamp(0.0, b1 + SHARPEN * temp, 255.0)));
}
//Do the effect for one pixel
static void do_mosaic_pixel(void * ptr, int which,
SDL_Surface * canvas, SDL_Surface * last,
@ -115,10 +216,10 @@ static void do_mosaic_pixel(void * ptr, int which,
magic_api * api = (magic_api *) ptr;
int i;
for (i=0;i<3;i++){
do_noise_pixel(ptr, 0, canvas, last, x, y);
mosaic_do_noise_pixel(ptr, 0, canvas, canvas, x, y);
}
do_blur_pixel(ptr, 0, canvas, last, x, y);
do_sharpen_pixel(ptr, 1, canvas, canvas, x, y);
mosaic_do_blur_pixel(ptr, 0, canvas, canvas, x, y);
//mosaic_do_sharpen_pixel(ptr, 0, canvas, last, x, y);
}
// Do the effect for the full image
@ -205,7 +306,6 @@ void mosaic_shutdown(magic_api * api)
Mix_FreeChunk(mosaic_snd_effect[i]);
}
}
sharpen_shutdown(api);
}
// Record the color from Tux Paint: