Converted Blocks, Chalk, Drip, Blur, Bricks, Cartoon, Drip, Fill, Grass,

Rainbow, Smudge and Tint Magic tools to plugins.

magic/src/blur.c

@@ -0,0 +1,159 @@
+#include <stdio.h>
+#include <string.h>
+#include <libintl.h>
+#include "tp_magic_api.h"
+#include "SDL_image.h"
+#include "SDL_mixer.h"
+
+
+/* Our globals: */
+
+Mix_Chunk * blur_snd;
+
+
+int blur_init(magic_api * api)
+{
+  char fname[1024];
+
+  snprintf(fname, sizeof(fname), "%s/sounds/magic/blur.wav",
+	    api->data_directory);
+  blur_snd = Mix_LoadWAV(fname);
+
+  return(1);
+}
+
+int blur_get_tool_count(magic_api * api)
+{
+  return(1);
+}
+
+// Load our icons:
+SDL_Surface * blur_get_icon(magic_api * api, int which)
+{
+  char fname[1024];
+
+  snprintf(fname, sizeof(fname), "%s/images/magic/blur.png",
+	   api->data_directory);
+
+  return(IMG_Load(fname));
+}
+
+// Return our names, localized:
+char * blur_get_name(magic_api * api, int which)
+{
+  return(strdup(gettext("Blur")));
+}
+
+// Return our descriptions, localized:
+char * blur_get_description(magic_api * api, int which)
+{
+  return(strdup(gettext(
+"Click and move the mouse around to blur the picture.")));
+}
+
+// Do the effect:
+
+void do_blur(void * ptr, int which, SDL_Surface * canvas, SDL_Surface * last,
+             int x, int y)
+{
+  magic_api * api = (magic_api *) ptr;
+  double state[32][32][3];
+  unsigned i;
+  Uint8 r, g, b;
+
+  i = 32 * 32;
+
+  while (i--)
+  {
+    int iy = i >> 5;
+    int ix = i & 0x1f;
+    // is it not on the circle of radius sqrt(220) at location 16,16?
+    if ((ix - 16) * (ix - 16) + (iy - 16) * (iy - 16) > 220)
+      continue;
+    // it is on the circle, so grab it
+
+    SDL_GetRGB(api->getpixel(canvas, x + ix - 16, y + iy - 16),
+               last->format, &r, &g, &b);
+    state[ix][iy][0] = api->sRGB_to_linear(r);
+    state[ix][iy][1] = api->sRGB_to_linear(g);
+    state[ix][iy][2] = api->sRGB_to_linear(b);
+  }
+
+  i = 32 * 32;
+  while (i--)
+  {
+    double lr, lg, lb;      // linear red,green,blue
+    double weight;
+    int iy = i >> 5;
+    int ix = i & 0x1f;
+    int r2 = (ix - 16) * (ix - 16) + (iy - 16) * (iy - 16); // radius squared
+
+    // is it not on the circle of radius sqrt(140) at location 16,16?
+    if (r2 > 140)
+      continue;
+
+    // It is on the circle, but how strongly will it be affected?
+    // This is lame; we should use something like a gaussian or cosine
+    // via a lookup table. (inverted, because this is the center weight)
+    weight = r2 / 16.0 + 3.0;
+
+    // Sampling more points would be good too, though it'd be slower.
+
+    lr = state[ix][iy - 1][0]
+      + state[ix - 1][iy][0] + state[ix][iy][0] * weight + state[ix +
+                                                                 1][iy][0]
+      + state[ix][iy + 1][0];
+
+    lg = state[ix][iy - 1][1]
+      + state[ix - 1][iy][1] + state[ix][iy][1] * weight + state[ix +
+                                                                 1][iy][1]
+      + state[ix][iy + 1][1];
+
+    lb = state[ix][iy - 1][2]
+      + state[ix - 1][iy][2] + state[ix][iy][2] * weight + state[ix +
+                                                                 1][iy][2]
+      + state[ix][iy + 1][2];
+
+    lr /= weight + 4.0;
+    lg /= weight + 4.0;
+    lb /= weight + 4.0;
+    api->putpixel(canvas, x + ix - 16, y + iy - 16,
+             SDL_MapRGB(canvas->format, api->linear_to_sRGB(lr),
+                        api->linear_to_sRGB(lg), api->linear_to_sRGB(lb)));
+  }
+}
+
+// Affect the canvas on drag:
+void blur_drag(magic_api * api, int which, SDL_Surface * canvas,
+	          SDL_Surface * last, int ox, int oy, int x, int y)
+{
+  api->line(which, canvas, last, ox, oy, x, y, 1, do_blur);
+
+  api->playsound(blur_snd, (x * 255) / canvas->w, 255);
+}
+
+// Affect the canvas on click:
+void blur_click(magic_api * api, int which,
+	           SDL_Surface * canvas, SDL_Surface * last,
+	           int x, int y)
+{
+  blur_drag(api, which, canvas, last, x, y, x, y);
+}
+
+void blur_shutdown(magic_api * api)
+{
+  if (blur_snd != NULL)
+    Mix_FreeChunk(blur_snd);
+}
+
+// Record the color from Tux Paint:
+void blur_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
+{
+}
+
+// Use colors:
+int blur_requires_colors(magic_api * api, int which)
+{
+  return 0;
+}
+