282 lines
7.6 KiB
C
282 lines
7.6 KiB
C
/*
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sharpen.c
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Sharpen, Trace Contour and Silhouette Magic Tool Plugin
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Tux Paint - A simple drawing program for children.
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FIXME: Credits
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Copyright (c) 2002-2008 by Bill Kendrick and others; see AUTHORS.txt
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bill@newbreedsoftware.com
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http://www.tuxpaint.org/
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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(See COPYING.txt)
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Last updated: July 8, 2008
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$Id$
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*/
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#include <stdio.h>
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#include <string.h>
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#include <libintl.h>
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#include "tp_magic_api.h"
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#include "SDL_image.h"
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#include "SDL_mixer.h"
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#include <math.h>
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#include <limits.h>
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#ifndef gettext_noop
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#define gettext_noop(String) String
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#endif
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/* Our globals: */
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enum {
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TOOL_TRACE,
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TOOL_SHARPEN,
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TOOL_SILHOUETTE,
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sharpen_NUM_TOOLS
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};
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//Holder for the unnormalised edge values
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double* sharpen_temp;
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const int THRESHOLD = 50;
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const double SHARPEN = 0.5;
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static Mix_Chunk * sharpen_snd_effect[sharpen_NUM_TOOLS];
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const char * sharpen_snd_filenames[sharpen_NUM_TOOLS] = {
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"flip.wav",
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"flip.wav",
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"flip.wav"
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};
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const char * sharpen_icon_filenames[sharpen_NUM_TOOLS] = {
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"flip.png",
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"flip.png",
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"flip.png"
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};
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const char * sharpen_names[sharpen_NUM_TOOLS] = {
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gettext_noop("Trace Contour"),
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gettext_noop("Sharpen"),
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gettext_noop("Silhouette")
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};
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const char * sharpen_descs[sharpen_NUM_TOOLS] = {
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gettext_noop("Click to trace the edges of objects in the image."),
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gettext_noop("Click to sharpen the image."),
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gettext_noop("Click to create a black and white silhouette of the image.")
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};
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Uint32 sharpen_api_version(void) { return(TP_MAGIC_API_VERSION); }
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// No setup required:
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int sharpen_init(magic_api * api){
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int i;
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char fname[1024];
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for (i = 0; i < sharpen_NUM_TOOLS; i++){
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snprintf(fname, sizeof(fname), "%s/sounds/magic/%s", api->data_directory, sharpen_snd_filenames[i]);
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sharpen_snd_effect[i] = Mix_LoadWAV(fname);
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}
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return(1);
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}
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// We have multiple tools:
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int sharpen_get_tool_count(magic_api * api)
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{
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return(sharpen_NUM_TOOLS);
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}
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// Load our icons:
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SDL_Surface * sharpen_get_icon(magic_api * api, int which){
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char fname[1024];
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snprintf(fname, sizeof(fname), "%simages/magic/%s", api->data_directory, sharpen_icon_filenames[which]);
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return(IMG_Load(fname));
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}
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// Return our names, localized:
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char * sharpen_get_name(magic_api * api, int which){
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return(strdup(gettext(sharpen_names[which])));
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}
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// Return our descriptions, localized:
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char * sharpen_get_description(magic_api * api, int which, int mode){
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return(strdup(gettext(sharpen_descs[which])));
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}
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//Calculates the grey scale value for a rgb pixel
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static int sharpen_grey(Uint8 r1,Uint8 g1,Uint8 b1){
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return 0.3*r1+.59*g1+0.11*b1;
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}
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// Do the effect:
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static void do_sharpen(void * ptr,SDL_Surface * canvas, SDL_Surface * last, int which)
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{
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magic_api * api = (magic_api *) ptr;
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sharpen_temp = (double*)malloc(api->canvas_w*api->canvas_h*sizeof(double));
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int x, y;
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int grey;
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Uint8 r1, g1, b1;
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//For sobel calculation
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int i,j;
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int sobel_1,sobel_2;
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//For normalisation
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double min=INT_MAX;
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double max=0;
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//Sobel weighting masks
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const int sobel_weights_1[3][3] = { {1,2,1},
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{0,0,0},
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{-1,-2,-1}};
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const int sobel_weights_2[3][3] = { {-1,0,1},
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{-2,0,2},
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{-1,0,1}};
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for (y = 0; y < canvas->h; y++){
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for (x=0; x < canvas->w; x++){
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//Calculate Sobel edge values
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sobel_1=0;
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sobel_2=0;
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for (i=-1;i<2;i++){
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for(j=-1; j<2; j++){
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//No need to check if inside canvas, getpixel does it for us.
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SDL_GetRGB(api->getpixel(last, x+i, y+j), last->format, &r1, &g1, &b1);
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grey = sharpen_grey(r1,g1,b1);
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sobel_1 += grey * sobel_weights_1[i+1][j+1];
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sobel_2 += grey * sobel_weights_2[i+1][j+1];
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}
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}
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//And store in temp variable
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//Cant just write to surface as they may not be 0-255 and surface will clamp them and lose data
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sharpen_temp[x*(canvas->h-1) + y] = sqrt(sobel_1*sobel_1 + sobel_2*sobel_2);
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//Calculate normalisation
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if (sharpen_temp[x*(canvas->h-1) + y]<min){
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min=sharpen_temp[x*(canvas->h-1) + y];
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}
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if(sharpen_temp[x*(canvas->h-1) + y]>max){
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max=sharpen_temp[x*(canvas->h-1) + y];
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}
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}
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}
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for (y = 0; y < canvas->h; y++){
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for (x=0; x < canvas->w; x++){
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//apply normalisation
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sharpen_temp[x*(canvas->h-1) + y]= ((sharpen_temp[x*(canvas->h-1) + y]-min)/(max-min))*255.0;
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// set image to white where edge value is below THRESHOLD
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if (which == TOOL_TRACE){
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if (sharpen_temp[x*(canvas->h-1) + y]<THRESHOLD)
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{
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, 255, 255, 255));
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}
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}
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//Simply display the edge values - provides a nice black and white silhouette image
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else if (which == TOOL_SILHOUETTE){
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, sharpen_temp[x*(canvas->h-1) + y],
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sharpen_temp[x*(canvas->h-1) + y],
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sharpen_temp[x*(canvas->h-1) + y]));
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}
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//Add the edge values to the original image, creating a more distinct jump in contrast at edges
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else if(which == TOOL_SHARPEN){
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SDL_GetRGB(api->getpixel(last, x, y), last->format, &r1, &g1, &b1);
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, clamp(0.0, r1 + SHARPEN * sharpen_temp[x*(canvas->h-1) + y], 255.0),
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clamp(0.0, g1 + SHARPEN * sharpen_temp[x*(canvas->h-1) + y], 255.0),
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clamp(0.0, b1 + SHARPEN * sharpen_temp[x*(canvas->h-1) + y], 255.0)));
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}
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}
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}
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//Clean up temp variable
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if (sharpen_temp != NULL){
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free(sharpen_temp);
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}
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}
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// Affect the canvas on drag:
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void sharpen_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * last, int ox, int oy, int x, int y,
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SDL_Rect * update_rect)
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{
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// No-op
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}
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// Affect the canvas on click:
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void sharpen_click(magic_api * api, int which, int mode,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y, SDL_Rect * update_rect)
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{
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update_rect->x = 0;
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update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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do_sharpen(api, canvas, last, which);
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//play sound
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api->playsound(sharpen_snd_effect[which], 128, 255);
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}
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// Affect the canvas on release:
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void sharpen_release(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y, SDL_Rect * update_rect)
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{
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}
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// No setup happened:
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void sharpen_shutdown(magic_api * api)
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{
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//Clean up sounds
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int i;
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for(i=0; i<sharpen_NUM_TOOLS; i++){
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if(sharpen_snd_effect[i] != NULL){
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Mix_FreeChunk(sharpen_snd_effect[i]);
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}
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}
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}
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// Record the color from Tux Paint:
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void sharpen_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
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{
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}
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// Use colors:
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int sharpen_requires_colors(magic_api * api, int which)
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{
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return 0;
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}
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void sharpen_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas)
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{
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}
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void sharpen_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas)
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{
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}
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int sharpen_modes(magic_api * api, int which)
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{
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return(MODE_FULLSCREEN); /* FIXME - Can also be turned into a painted effect */
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}
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