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tuxpaint-pencil-sharpener/magic/src/mosaic.c

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/*
mosaic.c
mosaic, Add a mosaic effect to the image using a combination of other tools.
Requires the mosaicAll sharpen and noise tools.
Tux Paint - A simple drawing program for children.
Credits: Andrew Corcoran <akanewbie@gmail.com>
Copyright (c) 2002-2007 by Bill Kendrick and others; see AUTHORS.txt
bill@newbreedsoftware.com
http://www.tuxpaint.org/
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
(See COPYING.txt)
Last updated: June 6, 2008
$Id$
*/
#include <stdio.h>
#include <string.h>
#include <libintl.h>
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
#include <math.h>
#include <limits.h>
#include <time.h>
#ifndef gettext_noop
#define gettext_noop(String) String
#endif
static void mosaic_noise_pixel(void * ptr, SDL_Surface * canvas, int noise_AMOUNT, int x, int y);
static void mosaic_blur_pixel(void * ptr, SDL_Surface * canvas, SDL_Surface * last, int x, int y);
static void mosaic_sharpen_pixel(void * ptr, SDL_Surface * canvas, SDL_Surface * last, int x, int y);
static const int mosaic_AMOUNT= 300;
static const int mosaic_RADIUS = 16;
static const double mosaic_SHARPEN = 1.0;
enum {
TOOL_MOSAIC,
mosaic_NUM_TOOLS
};
static Mix_Chunk * mosaic_snd_effect[mosaic_NUM_TOOLS];
const char * mosaic_snd_filenames[mosaic_NUM_TOOLS] = {
"flip.wav",
};
const char * mosaic_icon_filenames[mosaic_NUM_TOOLS] = {
"flip.png",
};
const char * mosaic_names[mosaic_NUM_TOOLS] = {
gettext_noop("Mosaic"),
};
const char * mosaic_descs[mosaic_NUM_TOOLS][2] = {
{gettext_noop("Click and move the mouse to add a mosaic effect to the image."),
gettext_noop("Click to add a mosaic effect to the entire image."),},
};
Uint32 mosaic_api_version(void) { return(TP_MAGIC_API_VERSION); }
//Load sounds
int mosaic_init(magic_api * api){
int i;
char fname[1024];
for (i = 0; i < mosaic_NUM_TOOLS; i++){
snprintf(fname, sizeof(fname), "%s/sounds/magic/%s", api->data_directory, mosaic_snd_filenames[i]);
mosaic_snd_effect[i] = Mix_LoadWAV(fname);
}
return(1);
}
int mosaic_get_tool_count(magic_api * api){
return(mosaic_NUM_TOOLS);
}
// Load our icons:
SDL_Surface * mosaic_get_icon(magic_api * api, int which){
char fname[1024];
snprintf(fname, sizeof(fname), "%simages/magic/%s", api->data_directory, mosaic_icon_filenames[which]);
return(IMG_Load(fname));
}
// Return our names, localized:
char * mosaic_get_name(magic_api * api, int which){
return(strdup(gettext(mosaic_names[which])));
}
// Return our descriptions, localized:
char * mosaic_get_description(magic_api * api, int which, int mode){
return(strdup(gettext(mosaic_descs[which][mode-1])));
}
//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 for the full image
static void do_mosaic_full(void * ptr, SDL_Surface * canvas, SDL_Surface * last, int which){
magic_api * api = (magic_api *) ptr;
Uint32 amask = ~(canvas->format->Rmask |
canvas->format->Gmask |
canvas->format->Bmask);
SDL_Surface * mosaic_temp =
SDL_CreateRGBSurface(SDL_SWSURFACE,
canvas->w,
canvas->h,
canvas->format->BitsPerPixel,
canvas->format->Rmask,
canvas->format->Gmask,
canvas->format->Bmask, amask);
int x,y;
api->update_progress_bar();
for (y = 0; y < canvas->h; y++){
for (x=0; x < canvas->w; x++){
mosaic_noise_pixel(api, canvas, mosaic_AMOUNT, x, y);
}
}
api->update_progress_bar();
for (y = 0; y < canvas->h; y++){
for (x=0; x < canvas->w; x++){
mosaic_blur_pixel(api, mosaic_temp, canvas, x, y);
}
}
api->update_progress_bar();
for (y = 0; y < canvas->h; y++){
for (x=0; x < canvas->w; x++){
mosaic_sharpen_pixel(api, canvas, mosaic_temp, x, y);
}
}
SDL_FreeSurface(mosaic_temp);
}
// Affect the canvas on drag:
void mosaic_drag(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * last, int ox, int oy, int x, int y,
SDL_Rect * update_rect){
//no-op
}
// Affect the canvas on click:
void mosaic_click(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * last,
int x, int y, SDL_Rect * update_rect){
update_rect->x = 0;
update_rect->y = 0;
update_rect->w = canvas->w;
update_rect->h = canvas->h;
do_mosaic_full(api, canvas, last, which);
api->playsound(mosaic_snd_effect[which], 128, 255);
}
// Affect the canvas on release:
void mosaic_release(magic_api * api, int which,
SDL_Surface * canvas, SDL_Surface * last,
int x, int y, SDL_Rect * update_rect)
{
}
// No setup happened:
void mosaic_shutdown(magic_api * api)
{
//Clean up sounds
int i;
for(i=0; i<mosaic_NUM_TOOLS; i++){
if(mosaic_snd_effect[i] != NULL){
Mix_FreeChunk(mosaic_snd_effect[i]);
}
}
}
// Record the color from Tux Paint:
void mosaic_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
{
}
// Use colors:
int mosaic_requires_colors(magic_api * api, int which)
{
return 0;
}
//Add noise to a pixel
static void mosaic_noise_pixel(void * ptr, SDL_Surface * canvas, int noise_AMOUNT, int x, int y){
magic_api * api = (magic_api *) ptr;
Uint8 temp[3];
double temp2[3];
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]));
}
//Blur a pixel
static void mosaic_blur_pixel(void * ptr, 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(last, x + i, y + j), last->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]));
}
//Sharpen a pixel
static void mosaic_sharpen_pixel(void * ptr,
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;
//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(last, x+i, y+j), last->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(last, x, y), last->format, &r1, &g1, &b1);
api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, clamp(0.0, r1 + mosaic_SHARPEN * temp, 255.0),
clamp(0.0, g1 + mosaic_SHARPEN * temp, 255.0),
clamp(0.0, b1 + mosaic_SHARPEN * temp, 255.0)));
}
void mosaic_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas)
{
}
void mosaic_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas)
{
}
int mosaic_modes(magic_api * api, int which)
{
return(MODE_FULLSCREEN);
}
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