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

Rainbow, Smudge and Tint Magic tools to plugins.

magic/src/grass.c

@@ -0,0 +1,199 @@
+#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 * grass_snd;
+Uint8 grass_r, grass_g, grass_b;
+SDL_Surface * img_grass;
+
+
+/* Local prototypes: */
+
+void do_grass(void * ptr, int which,
+	      SDL_Surface * canvas, SDL_Surface * last,
+	      int x, int y);
+
+static int log2int(int x);
+
+
+// No setup required:
+int grass_init(magic_api * api)
+{
+  char fname[1024];
+
+  snprintf(fname, sizeof(fname), "%s/sounds/magic/grass.wav",
+	    api->data_directory);
+  grass_snd = Mix_LoadWAV(fname);
+
+  snprintf(fname, sizeof(fname), "%s/images/magic/grass_data.png",
+	    api->data_directory);
+  img_grass = IMG_Load(fname);
+
+  return(1);
+}
+
+// We have multiple tools:
+int grass_get_tool_count(magic_api * api)
+{
+  return(1);
+}
+
+// Load our icons:
+SDL_Surface * grass_get_icon(magic_api * api, int which)
+{
+  char fname[1024];
+
+  snprintf(fname, sizeof(fname), "%s/images/magic/grass.png",
+	   api->data_directory);
+
+  return(IMG_Load(fname));
+}
+
+// Return our names, localized:
+char * grass_get_name(magic_api * api, int which)
+{
+  return(strdup(gettext("Grass")));
+}
+
+// Return our descriptions, localized:
+char * grass_get_description(magic_api * api, int which)
+{
+  return(strdup(gettext("Click and move to draw grass. Don’t forget the dirt!")));
+}
+
+
+// Affect the canvas on drag:
+void grass_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, 4, do_grass);
+
+  api->playsound(grass_snd,
+                 (x * 255) / canvas->w, (y * 255) / canvas->h);
+}
+
+// Affect the canvas on click:
+void grass_click(magic_api * api, int which,
+	           SDL_Surface * canvas, SDL_Surface * last,
+	           int x, int y)
+{
+  grass_drag(api, which, canvas, last, x, y, x, y);
+}
+
+// No setup happened:
+void grass_shutdown(magic_api * api)
+{
+  if (grass_snd != NULL)
+    Mix_FreeChunk(grass_snd);
+}
+
+// Record the color from Tux Paint:
+void grass_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
+{
+  grass_r = r;
+  grass_g = g;
+  grass_b = b;
+}
+
+// Use colors:
+int grass_requires_colors(magic_api * api, int which)
+{
+  return 1;
+}
+
+void do_grass(void * ptr, int which,
+	      SDL_Surface * canvas, SDL_Surface * last,
+	      int x, int y)
+{
+  magic_api * api = (magic_api *) ptr;
+  int xx, yy;
+  // grass color: 82,180,17
+  static int bucket;
+  double tmp_red, tmp_green, tmp_blue;
+  Uint8 r, g, b, a;
+  SDL_Rect src, dest;
+
+  if (!api->button_down())
+    bucket = 0;
+  bucket += (3.5 + (rand() / (double) RAND_MAX)) * 7.0;
+  while (bucket >= 0)
+  {
+    int rank =
+      log2int(((double) y / canvas->h) *
+              (0.99 + (rand() / (double) RAND_MAX)) * 64);
+    int ah = 1 << rank;
+    bucket -= ah;
+    src.x = (rand() % 4) * 64;
+    src.y = ah;
+    src.w = 64;
+    src.h = ah;
+
+    dest.x = x - 32;
+    dest.y = y - 30 + (int) ((rand() / (double) RAND_MAX) * 30);
+
+    tmp_red =
+      api->sRGB_to_linear(grass_r) * 2.0 +
+      (rand() / (double) RAND_MAX);
+    tmp_green =
+      api->sRGB_to_linear(grass_g) * 2.0 +
+      (rand() / (double) RAND_MAX);
+    tmp_blue =
+      api->sRGB_to_linear(grass_b) * 2.0 +
+      api->sRGB_to_linear(17);
+
+    for (yy = 0; yy < ah; yy++)
+    {
+      for (xx = 0; xx < 64; xx++)
+      {
+        double rd, gd, bd;
+
+        SDL_GetRGBA(api->getpixel(img_grass, xx + src.x, yy + src.y),
+                    img_grass->format, &r, &g, &b, &a);
+
+        rd = api->sRGB_to_linear(r) * 8.0 + tmp_red;
+        rd = rd * (a / 255.0) / 11.0;
+        gd = api->sRGB_to_linear(g) * 8.0 + tmp_green;
+        gd = gd * (a / 255.0) / 11.0;
+        bd = api->sRGB_to_linear(b) * 8.0 + tmp_blue;
+        bd = bd * (a / 255.0) / 11.0;
+
+        SDL_GetRGB(api->getpixel(canvas, xx + dest.x, yy + dest.y),
+                   canvas->format, &r, &g, &b);
+
+        r =
+          api->linear_to_sRGB(api->sRGB_to_linear(r) * (1.0 - a / 255.0) +
+                         rd);
+        g =
+          api->linear_to_sRGB(api->sRGB_to_linear(g) * (1.0 - a / 255.0) +
+                         gd);
+        b =
+          api->linear_to_sRGB(api->sRGB_to_linear(b) * (1.0 - a / 255.0) +
+                         bd);
+
+        api->putpixel(canvas, xx + dest.x, yy + dest.y,
+                 SDL_MapRGB(canvas->format, r, g, b));
+      }
+    }
+  }
+}
+
+// this one rounds down
+static int log2int(int x)
+{
+  int y = 0;
+  if (x <= 1)
+    return 0;
+  x >>= 1;
+  while (x)
+  {
+    x >>= 1;
+    y++;
+  }
+  return y;
+}
+