Theme.c

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/*
 * ObjectivelyMVC: Object oriented MVC framework for SDL3 and C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
 
#include <Objectively/JSONContext.h>
 
#include "ImageAtlas.h"
#include "Log.h"
#include "Theme.h"
#include "View.h"
#include "WindowController.h"
 
#define _Class _Theme
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
  Theme *this = (Theme *) self;
 
  release(this->fontCache);
  release(this->imageCache);
  release(this->icons);
  release(this->stylesheets);
 
  super(Object, self, dealloc);
}
 
#pragma mark - Theme
 
static void addStylesheet(Theme *self, Stylesheet *stylesheet) {
  $((Array *) self->stylesheets, addObject, stylesheet);
}
 
static String *cacheKey(const FontAttributes *attributes, float pixelDensity) {
 
  String *name = $$(Font, nameWithAttributes, attributes);
  assert(name);
 
  String *key = str("%s@%g", name->chars, pixelDensity);
  assert(key);
 
  release(name);
  return key;
}
 
static Image *image(Theme *self, const char *name, float pixelDensity) {
 
  assert(name);
 
  String *key = str("%s@%g", name, pixelDensity);
  assert(key);
 
  Image *image = $(self->imageCache, objectForKeyPath, key->chars);
  if (image == NULL) {
 
    image = $$(Image, imageWithResourceName, name, pixelDensity);
    if (image) {
      $(self->imageCache, setObjectForKeyPath, image, key->chars);
      release(image);
    }
  }
 
  release(key);
 
  return image;
}
 
static Font *font(Theme *self, const FontAttributes *attributes, float pixelDensity) {
 
  String *key = cacheKey(attributes, pixelDensity);
 
  Font *font = $(self->fontCache, objectForKeyPath, key->chars);
  if (font == NULL) {
 
    Font *resolved = $$(Font, fontWithAttributes, attributes, pixelDensity);
    assert(resolved);
 
    // Keyed by the resolved Font's own name: when the requested family is not registered,
    // Font::fontWithAttributes falls back to the default Font, and caching that under the
    // requested key would pin the wrong Font to it permanently. This way the request
    // simply misses again, and heals once the family is registered via Font::cacheFont.
    const FontAttributes resolvedAttributes = { resolved->family, resolved->size, resolved->style };
    String *resolvedKey = cacheKey(&resolvedAttributes, pixelDensity);
 
    font = $(self->fontCache, objectForKeyPath, resolvedKey->chars);
    if (font == NULL) {
      $(self->fontCache, setObjectForKeyPath, resolved, resolvedKey->chars);
      font = resolved;
    }
 
    release(resolvedKey);
    release(resolved);
  }
 
  release(key);
 
  return font;
}
 
static ImageAtlas *icons(Theme *self) {
 
  if (self->icons == NULL) {
    self->icons = $(alloc(ImageAtlas), init);
    assert(self->icons);
  }
 
  return self->icons;
}
 
static AtlasImage *addIcon(Theme *self, const char *name, Image *image) {
 
  ImageAtlas *atlas = $(self, icons);
 
  AtlasImage *icon = $(atlas, addImageWithName, name, image);
 
  if (!$(atlas, compile)) {
    MVC_LogError("Failed to compile icons after adding %s\n", name);
  }
 
  return icon;
}
 
static AtlasImage *icon(Theme *self, const char *name) {
  return $($(self, icons), imageWithName, name);
}
 
static ident computeStyle_reduce(const ident obj, ident accumulator, ident data) {
 
  const Stylesheet *stylesheet = obj;
 
  const View *view = data;
 
  const Array *selectors = (Array *) stylesheet->selectors;
  for (size_t i = 0; i < selectors->count; i++) {
 
    Selector *selector = $(selectors, objectAtIndex, i);
    if ($(selector, matchesView, view)) {
 
      assert(selector->style);
 
      if (MVC_LogEnabled(SDL_LOG_PRIORITY_VERBOSE)) {
 
        String *this = $((Object *) selector, description);
        String *that = $((Object *) view, description);
 
        MVC_LogVerbose("%s -> %s\n", this->chars, that->chars);
 
        release(this);
        release(that);
      }
 
      if ($(selector->style, attributeValue, "debug")) {
        SDL_TriggerBreakpoint();
      }
 
      $((Style *) accumulator, addSelector, selector);
      $((Style *) accumulator, addAttributes, selector->style->attributes);
    }
  }
 
  return accumulator;
}
 
static Style *computeStyle(const Theme *self, const View *view) {
 
  assert(view);
 
  Style *style = $(alloc(Style), initWithAttributes, NULL);
  assert(style);
 
  return $((Array *) self->stylesheets, reduce, computeStyle_reduce, style, (ident) view);
}
 
static Theme *init(Theme *self) {
 
  self = (Theme *) super(Object, self, init);
  if (self) {
 
    self->fontCache = $$(Dictionary, dictionary);
    assert(self->fontCache);
 
    self->imageCache = $$(Dictionary, dictionary);
    assert(self->imageCache);
 
    self->stylesheets = $$(Array, arrayWithCapacity, 8);
    assert(self->stylesheets);
 
    $(self, addStylesheet, $$(Stylesheet, defaultStylesheet));
  }
 
  return self;
}
 
static void removeStylesheet(Theme *self, Stylesheet *stylesheet) {
  $((Array *) self->stylesheets, removeObject, stylesheet);
}
 
static void renderDeviceWillReset_enumerate(const Dictionary *dictionary, ident obj, ident key, ident data) {
  $((Font *) obj, renderDeviceWillReset);
}
 
static void renderDeviceWillReset(Theme *self) {
  $(self->fontCache, enumerateObjectsAndKeys, renderDeviceWillReset_enumerate, NULL);
  if (self->icons) {
    $(self->icons, renderDeviceWillReset);
  }
}
 
static void renderDeviceDidReset(Theme *self) {
  // Bitmap Textures are recreated lazily by ImageAtlas::texture on next use.
}
 
static Theme *theme(SDL_Window *window) {
 
  assert(window);
 
  WindowController *windowController = $$(WindowController, windowController, window);
  if (windowController) {
    return windowController->theme;
  }
 
  return NULL;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
  ((ThemeInterface *) clazz->interface)->addIcon = addIcon;
  ((ThemeInterface *) clazz->interface)->addStylesheet = addStylesheet;
  ((ThemeInterface *) clazz->interface)->computeStyle = computeStyle;
  ((ThemeInterface *) clazz->interface)->font = font;
  ((ThemeInterface *) clazz->interface)->image = image;
  ((ThemeInterface *) clazz->interface)->icon = icon;
  ((ThemeInterface *) clazz->interface)->icons = icons;
  ((ThemeInterface *) clazz->interface)->init = init;
  ((ThemeInterface *) clazz->interface)->removeStylesheet = removeStylesheet;
  ((ThemeInterface *) clazz->interface)->renderDeviceDidReset = renderDeviceDidReset;
  ((ThemeInterface *) clazz->interface)->renderDeviceWillReset = renderDeviceWillReset;
  ((ThemeInterface *) clazz->interface)->theme = theme;
}
 
Class *_Theme(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "Theme",
      .superclass = _Object(),
      .instanceSize = sizeof(Theme),
      .interfaceSize = sizeof(ThemeInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class