add text_style_t, draw-text.c

3 files changed, 197 insertions, 94 deletions

diff --git a/src/sdl/draw-text.c b/src/sdl/draw-text.c
new file mode 100644
index 0000000..0e58949
--- /dev/null
+++ b/src/sdl/draw-text.c
@@ -0,0 +1,130 @@
+#include "draw-text.h"
+#include "util.h"
+
+static SDL_Rect
+text_get_rect(
+  SDL_Renderer * const renderer,
+  TTF_Font * const font,
+  const text_style_t * const style,
+  const char * const buf
+) {
+  // get renderer size
+  int renderer_w, renderer_h;
+  if (SDL_GetRendererOutputSize(renderer, &renderer_w, &renderer_h)) {
+    die("SDL_GetRendererOutputSize(): %s", SDL_GetError());
+  }
+
+  // get text size
+  int text_w, text_h;
+  if (TTF_SizeText(font, buf, &text_w, &text_h)) {
+    die("TTF_SizeText(): %s", TTF_GetError());
+  }
+
+  // build rect
+  switch (style->align) {
+  case TEXT_ALIGN_TOP_LEFT:
+    return (SDL_Rect) { 
+      .x = style->pad.x,
+      .y = style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_TOP_CENTER:
+    return (SDL_Rect) {
+      .x = (renderer_w - text_w) / 2 + style->pad.x,
+      .y = style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_TOP_RIGHT:
+    return (SDL_Rect) {
+      .x = renderer_w - text_w - style->pad.x,
+      .y = style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_CENTER_LEFT:
+    return (SDL_Rect) {
+      .x = style->pad.x,
+      .y = (renderer_h - text_h) / 2 + style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_CENTER_CENTER:
+    return (SDL_Rect) {
+      .x = (renderer_w - text_w) / 2 + style->pad.x,
+      .y = (renderer_h - text_h) / 2 + style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_CENTER_RIGHT:
+    return (SDL_Rect) {
+      .x = renderer_w - text_w - style->pad.x,
+      .y = (renderer_h - text_h) / 2 + style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_BOTTOM_LEFT:
+    return (SDL_Rect) {
+      .x = style->pad.x,
+      .y = renderer_h - text_h - style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_BOTTOM_CENTER:
+    return (SDL_Rect) {
+      .x = (renderer_w - text_w) / 2 + style->pad.x,
+      .y = renderer_h - text_h - style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  case TEXT_ALIGN_BOTTOM_RIGHT:
+    return (SDL_Rect) {
+      .x = renderer_w - text_w - style->pad.x,
+      .y = renderer_h - text_h - style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  default:
+    return (SDL_Rect) {
+      .x = style->pad.x,
+      .y = style->pad.y,
+      .w = text_w,
+      .h = text_h,
+    };
+  }
+}
+
+void
+draw_text(
+  SDL_Renderer * const renderer,
+  TTF_Font * const font,
+  const text_style_t * const style,
+  const char * const buf
+) {
+  // get rect
+  const SDL_Rect rect = text_get_rect(renderer, font, style, buf);
+
+  // create surface, check for error
+  SDL_Surface *surface = TTF_RenderText_Shaded(font, buf, style->colors[0], style->colors[1]);
+  if (!surface) {
+    die("TTF_RenderText_Blended(): %s", TTF_GetError());
+  }
+
+  // create texture, check for error
+  SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
+  if (!texture) {
+    die("SDL_CreateTextureFromSurface(): %s", SDL_GetError());
+  }
+
+  // free surface
+  SDL_FreeSurface(surface);
+
+  // render text
+  if (SDL_RenderCopy(renderer, texture, NULL, &rect)) {
+    die("SDL_RenderCopy(): %s", SDL_GetError());
+  }
+
+  // free texture
+  SDL_DestroyTexture(texture);
+}
diff --git a/src/sdl/draw-text.h b/src/sdl/draw-text.h
new file mode 100644
index 0000000..b58c1c1
--- /dev/null
+++ b/src/sdl/draw-text.h
@@ -0,0 +1,35 @@
+#ifndef DRAW_TEXT_H
+#define DRAW_TEXT_H
+
+#include "../libsok/sok.h" // sok_pos_t
+#include <SDL.h> // SDL_Color
+#include <SDL_ttf.h> // TTF_Font
+
+typedef enum {
+  TEXT_ALIGN_TOP_LEFT,
+  TEXT_ALIGN_TOP_CENTER,
+  TEXT_ALIGN_TOP_RIGHT,
+  TEXT_ALIGN_CENTER_LEFT,
+  TEXT_ALIGN_CENTER_CENTER,
+  TEXT_ALIGN_CENTER_RIGHT,
+  TEXT_ALIGN_BOTTOM_LEFT,
+  TEXT_ALIGN_BOTTOM_RIGHT,
+  TEXT_ALIGN_BOTTOM_CENTER,
+  TEXT_ALIGN_LAST,
+} text_align_t;
+
+typedef struct {
+  const text_align_t align;
+  const sok_pos_t pad;
+  const SDL_Color colors[2];
+} text_style_t;
+
+void
+draw_text(
+  SDL_Renderer * const,
+  TTF_Font * const,
+  const text_style_t * const,
+  const char * const
+);
+
+#endif /* DRAW_TEXT_H */
diff --git a/src/sdl/draw.c b/src/sdl/draw.c
index 2dab2ee..418ddd2 100644
--- a/src/sdl/draw.c
+++ b/src/sdl/draw.c
@@ -4,6 +4,7 @@
 #include "color.h" // set_color()
 #include "draw.h"
 #include "sprites.h"
+#include "draw-text.h"
 
 #define M_2_PI (2.0 * 3.1415926)
 
@@ -189,50 +190,17 @@ DRAW_CBS = {
   .on_box         = draw_sprites_on_box,
 };
 
-static const SDL_Color
-TEXT_COLORS[] = {
-  { 0xff, 0xff, 0xff, 0xff }, // fg
-  { 0x00, 0x00, 0x00, 0xff }, // bg
+static const text_style_t
+TITLE_STYLE = {
+  .align  = TEXT_ALIGN_TOP_CENTER,
+  .pad    = { 0, 10 },
+  .colors = {
+    { 0xff, 0xff, 0xff, 0xff },
+    { 0x00, 0x00, 0x00, 0xff },
+  },
 };
 
 static void
-draw_text(
-  draw_ctx_t * const draw_ctx,
-  const char * const buf,
-  const SDL_Rect * const rect
-) {
-  // create surface
-  SDL_Surface *surface = TTF_RenderText_Shaded(
-    draw_ctx->font,
-    buf,
-    TEXT_COLORS[0],
-    TEXT_COLORS[1]
-  );
-
-  // check for error
-  if (!surface) {
-    die("TTF_RenderText_Blended(): %s", TTF_GetError());
-  }
-
-  // create texture
-  SDL_Texture *texture = SDL_CreateTextureFromSurface(draw_ctx->renderer, surface);
-  if (!texture) {
-    die("SDL_CreateTextureFromSurface(): %s", SDL_GetError());
-  }
-
-  // free surface
-  SDL_FreeSurface(surface);
-
-  // render text
-  if (SDL_RenderCopy(draw_ctx->renderer, texture, NULL, rect)) {
-    die("SDL_RenderCopy(): %s", SDL_GetError());
-  }
-
-  // free texture
-  SDL_DestroyTexture(texture);
-}
-
-static void
 draw_title_text(
   draw_ctx_t * const draw_ctx
 ) {
@@ -246,25 +214,20 @@ draw_title_text(
     *draw_ctx->level_num
   );
 
-  // get renderer width
-  int renderer_w;
-  if (SDL_GetRendererOutputSize(draw_ctx->renderer, &renderer_w, NULL)) {
-    die("SDL_GetRendererOutputSize(): %s", SDL_GetError());
-  }
-
-  // get text size
-  int text_w, text_h;
-  if (TTF_SizeText(draw_ctx->font, buf, &text_w, &text_h)) {
-    die("TTF_SizeText(): %s", TTF_GetError());
-  }
-
-  // build rect
-  const SDL_Rect rect = { (renderer_w - text_w) / 2, 10, text_w, text_h };
-
   // draw text
-  draw_text(draw_ctx, buf, &rect);
+  draw_text(draw_ctx->renderer, draw_ctx->font, &TITLE_STYLE, buf);
 }
 
+static const text_style_t
+MOVES_STYLE = {
+  .align  = TEXT_ALIGN_BOTTOM_LEFT,
+  .pad    = { 10, 10 },
+  .colors = {
+    { 0xff, 0xff, 0xff, 0xff },
+    { 0x00, 0x00, 0x00, 0xff },
+  },
+};
+
 static void
 draw_moves_text(
   draw_ctx_t * const draw_ctx
@@ -278,25 +241,20 @@ draw_moves_text(
     sok_ctx_is_done(draw_ctx->ctx) ? " (Won!)" : ""
   );
 
-  // get renderer height
-  int renderer_h;
-  if (SDL_GetRendererOutputSize(draw_ctx->renderer, NULL, &renderer_h)) {
-    die("SDL_GetRendererOutputSize(): %s", SDL_GetError());
-  }
-
-  // get text size
-  int text_w, text_h;
-  if (TTF_SizeText(draw_ctx->font, buf, &text_w, &text_h)) {
-    die("TTF_SizeText(): %s", TTF_GetError());
-  }
-
-  // build rect
-  const SDL_Rect rect = { 10, renderer_h - text_h - 10, text_w, text_h };
-
   // draw text
-  draw_text(draw_ctx, buf, &rect);
+  draw_text(draw_ctx->renderer, draw_ctx->font, &MOVES_STYLE, buf);
 }
 
+static const text_style_t
+HELP_STYLE = {
+  .align  = TEXT_ALIGN_BOTTOM_RIGHT,
+  .pad    = { 10, 10 },
+  .colors = {
+    { 0xff, 0xff, 0xff, 0xff },
+    { 0x00, 0x00, 0x00, 0xff },
+  },
+};
+
 #define DELIM "     "
 
 static void
@@ -311,28 +269,8 @@ draw_help_text(
     sok_ctx_is_done(draw_ctx->ctx) ? "Space: Next Level" DELIM : ""
   );
 
-  // get renderer height
-  int renderer_w, renderer_h;
-  if (SDL_GetRendererOutputSize(draw_ctx->renderer, &renderer_w, &renderer_h)) {
-    die("SDL_GetRendererOutputSize(): %s", SDL_GetError());
-  }
-
-  // get text size
-  int text_w, text_h;
-  if (TTF_SizeText(draw_ctx->font, buf, &text_w, &text_h)) {
-    die("TTF_SizeText(): %s", TTF_GetError());
-  }
-
-  // build rect
-  const SDL_Rect rect = {
-    renderer_w - text_w - 10,
-    renderer_h - text_h - 10,
-    text_w,
-    text_h,
-  };
-
   // draw text
-  draw_text(draw_ctx, buf, &rect);
+  draw_text(draw_ctx->renderer, draw_ctx->font, &HELP_STYLE, buf);
 }
 
 static void