From 8b527949b0a74a37079210a6fc8fabbd576432eb Mon Sep 17 00:00:00 2001
From: Harry Jeffery <harry@exec64.co.uk>
Date: Wed, 11 Nov 2015 15:22:41 +0000
Subject: Update makefile to use a build directory

---
 src/viewport.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/viewport.c

(limited to 'src/viewport.c')

diff --git a/src/viewport.c b/src/viewport.c
new file mode 100644
index 0000000..1630604
--- /dev/null
+++ b/src/viewport.c
@@ -0,0 +1,119 @@
+/* Copyright (c) 2015 Harry Jeffery
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+
+#include "viewport.h"
+#include "image.h"
+
+void imv_init_viewport(struct imv_viewport *view, SDL_Window *window)
+{
+  view->window = window;
+  view->scale = 1;
+  view->x = view->y = view->fullscreen = view->redraw = 0;
+  view->playing = 1;
+}
+
+void imv_destroy_viewport(struct imv_viewport *view)
+{
+  view->window = NULL;
+  return;
+}
+
+void imv_viewport_toggle_fullscreen(struct imv_viewport *view)
+{
+  if(view->fullscreen) {
+    SDL_SetWindowFullscreen(view->window, 0);
+    view->fullscreen = 0;
+  } else {
+    SDL_SetWindowFullscreen(view->window, SDL_WINDOW_FULLSCREEN_DESKTOP);
+    view->fullscreen = 1;
+  }
+}
+
+void imv_viewport_toggle_playing(struct imv_viewport *view, struct imv_image *img)
+{
+  if(view->playing) {
+    view->playing = 0;
+  } else if(imv_image_is_animated(img)) {
+    view->playing = 1;
+  }
+}
+
+void imv_viewport_reset(struct imv_viewport *view)
+{
+  view->scale = 1;
+  view->x = view->y = 0;
+  view->redraw = 1;
+}
+
+void imv_viewport_move(struct imv_viewport *view, int x, int y)
+{
+  view->x += x;
+  view->y += y;
+  view->redraw = 1;
+}
+
+void imv_viewport_zoom(struct imv_viewport *view, int amount)
+{
+  view->scale += amount * 0.1;
+  if(view->scale > 100)
+    view->scale = 10;
+  else if (view->scale < 0.01)
+    view->scale = 0.1;
+  view->redraw = 1;
+}
+
+void imv_viewport_center(struct imv_viewport *view, const struct imv_image* img)
+{
+  int ww, wh;
+  SDL_GetWindowSize(view->window, &ww, &wh);
+
+  view->x = (ww - img->width * view->scale) / 2;
+  view->y = (wh - img->height * view->scale) / 2;
+
+  view->redraw = 1;
+}
+
+void imv_viewport_scale_to_window(struct imv_viewport *view, const struct imv_image* img)
+{
+  int ww, wh;
+  SDL_GetWindowSize(view->window, &ww, &wh);
+
+  double window_aspect = (double)ww / (double)wh;
+  double image_aspect = (double)img->width / (double)img->height;
+
+  if(window_aspect > image_aspect) {
+    /* Image will become too tall before it becomes too wide */
+    view->scale = (double)wh / (double)img->height;
+  } else {
+    /* Image will become too wide before it becomes too tall */
+    view->scale = (double)ww / (double)img->width;
+  }
+
+  imv_viewport_center(view, img);
+}
+
+void imv_viewport_set_redraw(struct imv_viewport *view)
+{
+  view->redraw = 1;
+}
+
+void imv_viewport_set_title(struct imv_viewport *view, char* title)
+{
+  SDL_SetWindowTitle(view->window, title);
+}
-- 
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