Finalised mosaic.c
This commit is contained in:
Andrew Corcoran
parent
9e1a97efd5
commit
40c8c1ff1f
3 changed files with 162 additions and 105 deletions
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@ -118,7 +118,7 @@ static void do_blur_pixel(void * ptr, int which,
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for (i=-2;i<3;i++){
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for (j=-2;j<3;j++){
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//Add the pixels around the current one wieghted
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SDL_GetRGB(api->getpixel(canvas, x + i, y + j), canvas->format, &temp[0], &temp[1], &temp[2]);
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SDL_GetRGB(api->getpixel(last, x + i, y + j), last->format, &temp[0], &temp[1], &temp[2]);
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for (k =0;k<3;k++){
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blurValue[k] += temp[k]* weight[i+2][j+2];
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}
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@ -47,8 +47,13 @@
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#endif
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double mosaic_AMOUNT= 30.0;
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const int mosaic_AMOUNT= 300;
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const int mosaic_RADIUS = 16;
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const double mosaic_SHARPEN = 1.0;
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//Holder for the pre calulated pixel values
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SDL_Surface * mosaic_temp;
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SDL_Surface * mosaic_final;
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enum {
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TOOL_MOSAIC,
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@ -107,106 +112,15 @@ char * mosaic_get_description(magic_api * api, int which){
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return(strdup(gettext(mosaic_descs[which])));
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}
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//Do the effect for one pixel
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static void mosaic_do_noise_pixel(void * ptr, int which,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y){
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magic_api * api = (magic_api *) ptr;
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Uint8 temp[3];
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double temp2[3];
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const int noise_AMOUNT = 100.0;
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SDL_GetRGB(api->getpixel(canvas,x, y), canvas->format, &temp[0], &temp[1], &temp[2]);
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int k;
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for (k =0;k<3;k++){
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temp2[k] = clamp(0.0, (int)temp[k] - (rand()%noise_AMOUNT) + noise_AMOUNT/2.0, 255.0);
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}
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, temp2[0], temp2[1], temp2[2]));
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}
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//Do the effect for one pixel
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static void mosaic_do_blur_pixel(void * ptr, int which,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y){
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magic_api * api = (magic_api *) ptr;
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int i,j,k;
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Uint8 temp[3];
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double blurValue[3];
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for (k =0;k<3;k++){
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blurValue[k] = 0;
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}
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//5x5 gaussiann weighting window
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const int weight[5][5] = { {1,4,7,4,1},
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{4,16,26,16,4},
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{7,26,41,26,7},
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{4,16,26,16,4},
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{1,4,7,4,1}};
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for (i=-2;i<3;i++){
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for (j=-2;j<3;j++){
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//Add the pixels around the current one wieghted
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SDL_GetRGB(api->getpixel(canvas, x + i, y + j), canvas->format, &temp[0], &temp[1], &temp[2]);
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for (k =0;k<3;k++){
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blurValue[k] += temp[k]* weight[i+2][j+2];
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}
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}
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}
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for (k =0;k<3;k++){
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blurValue[k] /= 273;
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}
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, blurValue[0], blurValue[1], blurValue[2]));
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}
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//Calculates the grey scale value for a rgb pixel
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static int mosaic_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 mosaic_do_sharpen_pixel(void * ptr, int which,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y){
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//Do the effect for one pixel
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static void mosaic_do_noise_pixel(magic_api * api, SDL_Surface * canvas, SDL_Surface * last, int x, int y){
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magic_api * api = (magic_api *) ptr;
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Uint8 r1, g1, b1;
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int grey;
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int i,j;
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double sobel_1=0,sobel_2=0;
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const double SHARPEN = 0.5;
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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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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(canvas, x+i, y+j), canvas->format, &r1, &g1, &b1);
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grey = mosaic_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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double temp = sqrt(sobel_1*sobel_1 + sobel_2*sobel_2);
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temp = (temp/1443)*255.0;
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SDL_GetRGB(api->getpixel(canvas, x, y), canvas->format, &r1, &g1, &b1);
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, clamp(0.0, r1 + SHARPEN * temp, 255.0),
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clamp(0.0, g1 + SHARPEN * temp, 255.0),
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clamp(0.0, b1 + SHARPEN * temp, 255.0)));
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}
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//Do the effect for one pixel
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@ -214,12 +128,10 @@ static void do_mosaic_pixel(void * ptr, int which,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y){
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magic_api * api = (magic_api *) ptr;
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int i;
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for (i=0;i<3;i++){
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mosaic_do_noise_pixel(ptr, 0, canvas, canvas, x, y);
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}
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mosaic_do_blur_pixel(ptr, 0, canvas, canvas, x, y);
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//mosaic_do_sharpen_pixel(ptr, 0, canvas, last, x, y);
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Uint8 r1,g1,b1;
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SDL_GetRGB(api->getpixel(mosaic_final, x, y), mosaic_final->format, &r1, &g1, &b1);
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, r1, g1, b1));
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}
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// Do the effect for the full image
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@ -229,8 +141,8 @@ static void do_mosaic_full(void * ptr, SDL_Surface * canvas, SDL_Surface * last,
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int x,y;
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for (y = 0; y < last->h; y++){
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for (x=0; x < last->w; x++){
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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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do_mosaic_pixel(ptr, which, canvas, last, x, y);
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}
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}
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@ -319,12 +231,157 @@ int mosaic_requires_colors(magic_api * api, int which)
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return 0;
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}
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//Add noise to a pixel
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static void mosaic_noise_pixel(void * ptr, SDL_Surface * canvas, int noise_AMOUNT, int x, int y){
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magic_api * api = (magic_api *) ptr;
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Uint8 temp[3];
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double temp2[3];
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SDL_GetRGB(api->getpixel(canvas,x, y), canvas->format, &temp[0], &temp[1], &temp[2]);
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int k;
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for (k =0;k<3;k++){
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temp2[k] = clamp(0.0, (int)temp[k] - (rand()%noise_AMOUNT) + noise_AMOUNT/2.0, 255.0);
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}
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, temp2[0], temp2[1], temp2[2]));
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}
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//Blur a pixel
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static void mosaic_blur_pixel(void * ptr, SDL_Surface * canvas, SDL_Surface * last, int x, int y){
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magic_api * api = (magic_api *) ptr;
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int i,j,k;
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Uint8 temp[3];
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double blurValue[3];
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for (k =0;k<3;k++){
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blurValue[k] = 0;
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}
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//5x5 gaussiann weighting window
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const int weight[5][5] = { {1,4,7,4,1},
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{4,16,26,16,4},
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{7,26,41,26,7},
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{4,16,26,16,4},
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{1,4,7,4,1}};
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for (i=-2;i<3;i++){
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for (j=-2;j<3;j++){
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//Add the pixels around the current one wieghted
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SDL_GetRGB(api->getpixel(last, x + i, y + j), last->format, &temp[0], &temp[1], &temp[2]);
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for (k =0;k<3;k++){
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blurValue[k] += temp[k]* weight[i+2][j+2];
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}
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}
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}
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for (k =0;k<3;k++){
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blurValue[k] /= 273;
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}
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api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, blurValue[0], blurValue[1], blurValue[2]));
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}
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//Sharpen a pixel
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static void mosaic_sharpen_pixel(void * ptr,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y){
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magic_api * api = (magic_api *) ptr;
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Uint8 r1, g1, b1;
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int grey;
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int i,j;
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double sobel_1=0,sobel_2=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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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 = mosaic_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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double temp = sqrt(sobel_1*sobel_1 + sobel_2*sobel_2);
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temp = (temp/1443)*255.0;
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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 + mosaic_SHARPEN * temp, 255.0),
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clamp(0.0, g1 + mosaic_SHARPEN * temp, 255.0),
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clamp(0.0, b1 + mosaic_SHARPEN * temp, 255.0)));
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}
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void mosaic_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas)
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{
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//Create two temp surfaces to store the calculated pixel values
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Uint32 amask = ~(canvas->format->Rmask |
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canvas->format->Gmask |
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canvas->format->Bmask);
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mosaic_temp =
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SDL_CreateRGBSurface(SDL_SWSURFACE,
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canvas->w,
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canvas->h,
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canvas->format->BitsPerPixel,
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canvas->format->Rmask,
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canvas->format->Gmask,
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canvas->format->Bmask, amask);
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mosaic_final =
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SDL_CreateRGBSurface(SDL_SWSURFACE,
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canvas->w,
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canvas->h,
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canvas->format->BitsPerPixel,
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canvas->format->Rmask,
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canvas->format->Gmask,
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canvas->format->Bmask, amask);
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//Copy the canvas to the temp surface
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SDL_BlitSurface(canvas, NULL, mosaic_final, NULL);
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int x,y;
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//Add noise to the temp surface
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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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mosaic_noise_pixel(api, mosaic_final, mosaic_AMOUNT, x, y);
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}
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}
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api->update_progress_bar();
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//Blur the temp surface
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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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//We dont want pixels to be affected by already blurred nearby pixels so we require two surfaces
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mosaic_blur_pixel(api, mosaic_temp, mosaic_final, x, y);
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}
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}
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api->update_progress_bar();
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//Sharpen the temp surface
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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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//We dont want pixels to be affected by already blurred nearby pixels so we require two surfaces
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mosaic_sharpen_pixel(api, mosaic_final, mosaic_temp, x, y);
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}
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}
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}
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void mosaic_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas)
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{
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SDL_FreeSurface(mosaic_temp);
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SDL_FreeSurface(mosaic_final);
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}
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int mosaic_modes(magic_api * api, int which)
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@ -153,7 +153,7 @@ static void do_sharpen_pixel(void * ptr, int which,
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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(canvas, x+i, y+j), canvas->format, &r1, &g1, &b1);
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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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@ -175,7 +175,7 @@ static void do_sharpen_pixel(void * ptr, int which,
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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(canvas, x, y), canvas->format, &r1, &g1, &b1);
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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 * temp, 255.0),
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clamp(0.0, g1 + SHARPEN * temp, 255.0),
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clamp(0.0, b1 + SHARPEN * temp, 255.0)));
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