ImageView.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 "ImageAtlas.h"
#include "ImageView.h"
#include "Theme.h"
 
const EnumName SDLGPUBlendFactorNames[] = MakeEnumNames(
  MakeEnumName(SDL_GPU_BLENDFACTOR_ZERO),
  MakeEnumName(SDL_GPU_BLENDFACTOR_ONE),
  MakeEnumName(SDL_GPU_BLENDFACTOR_SRC_COLOR),
  MakeEnumName(SDL_GPU_BLENDFACTOR_ONE_MINUS_SRC_COLOR),
  MakeEnumName(SDL_GPU_BLENDFACTOR_DST_COLOR),
  MakeEnumName(SDL_GPU_BLENDFACTOR_ONE_MINUS_DST_COLOR),
  MakeEnumName(SDL_GPU_BLENDFACTOR_SRC_ALPHA),
  MakeEnumName(SDL_GPU_BLENDFACTOR_ONE_MINUS_SRC_ALPHA),
  MakeEnumName(SDL_GPU_BLENDFACTOR_DST_ALPHA),
  MakeEnumName(SDL_GPU_BLENDFACTOR_ONE_MINUS_DST_ALPHA),
  MakeEnumName(SDL_GPU_BLENDFACTOR_CONSTANT_COLOR),
  MakeEnumName(SDL_GPU_BLENDFACTOR_ONE_MINUS_CONSTANT_COLOR),
  MakeEnumName(SDL_GPU_BLENDFACTOR_SRC_ALPHA_SATURATE)
);
 
#define _Class _ImageView
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
  ImageView *this = (ImageView *) self;
 
  release(this->image);
 
  free(this->imageName);
 
  this->texture = release(this->texture);
 
  super(Object, self, dealloc);
}
 
#pragma mark - View
 
static void awakeWithDictionary(View *self, const Dictionary *dictionary) {
 
  super(View, self, awakeWithDictionary, dictionary);
 
  ImageView *this = (ImageView *) self;
 
  const Inlet inlets[] = MakeInlets(
    MakeInlet("blend.src", InletTypeEnum, &this->blend.src, (ident) SDLGPUBlendFactorNames),
    MakeInlet("blend.dst", InletTypeEnum, &this->blend.dst, (ident) SDLGPUBlendFactorNames),
    MakeInlet("color", InletTypeColor, &this->color, NULL),
    MakeInlet("image", InletTypeCharacters, &this->imageName, NULL)
  );
 
  $(self, bind, inlets, dictionary);
}
 
static void didMoveToWindow(View *self, SDL_Window *window) {
 
  super(View, self, didMoveToWindow, window);
 
  ImageView *this = (ImageView *) self;
 
  // leaving a window resolves nothing: there is no density to resolve against, and View::dealloc
  // moves to a NULL window, where loading an image would be worse than pointless
  if (window == NULL) {
    return;
  }
 
  if (this->imageName == NULL) {
    return;
  }
 
  char *name = this->imageName;
  this->imageName = NULL;
 
  Theme *theme = $$(Theme, theme, window);
  if (theme) {
    Image *image = $(theme, image, name, SDL_GetWindowPixelDensity(window));
    $(this, setImage, image);
  } else {
    Image *image = $$(Image, imageWithResourceName, name, SDL_GetWindowPixelDensity(window));
    $(this, setImage, image);
    release(image);
  }
 
  this->imageName = name;
}
 
static View *init(View *self) {
  return (View *) $((ImageView *) self, initWithImage, NULL);
}
 
static void render(View *self, Renderer *renderer) {
 
  super(View, self, render, renderer);
 
  ImageView *this = (ImageView *) self;
 
  Texture *texture = NULL;
  SDL_Rect region, *src = NULL;
 
  if (this->image) {
    if ($((Object *) this->image, isKindOfClass, _AtlasImage())) {
 
      // The atlas owns the Texture, and repacks on compile, so neither is cached here
      AtlasImage *atlasImage = (AtlasImage *) this->image;
      if (atlasImage->atlas) {
        texture = $(atlasImage->atlas, texture, renderer->device);
        region = atlasImage->rect;
        src = &region;
      }
 
    } else {
      if (this->texture == NULL) {
        this->texture = $(renderer->device, createTextureFromSurface,
          this->image->surface, SDL_GPU_TEXTUREUSAGE_SAMPLER, false);
        assert(this->texture);
      }
      texture = this->texture;
    }
  } else {
    texture = this->texture;
  }
 
  if (texture) {
 
    // TODO: Actually use self->blend
 
    const SDL_Rect frame = $(self, renderFrame);
 
    SDL_FRect frect;
    SDL_RectToFRect(&frame, &frect);
 
    if (self->borderRadius > 0) {
      $(renderer, drawRoundedTextureRegion, texture, src, &frect, self->borderRadius, &this->color);
    } else {
      $(renderer, drawTextureRegion, texture, src, &frect, &this->color);
    }
  }
}
 
static void renderDeviceWillReset(View *self) {
 
  ImageView *this = (ImageView *) self;
 
  this->texture = release(this->texture);
 
  if (this->image && $((Object *) this->image, isKindOfClass, _AtlasImage())) {
    ImageAtlas *atlas = ((AtlasImage *) this->image)->atlas;
    if (atlas) {
      $(atlas, renderDeviceWillReset);
    }
  }
 
  super(View, self, renderDeviceWillReset);
}
 
#pragma mark - ImageView
 
static ImageView *initWithFrame(ImageView *self, const SDL_Rect *frame) {
 
  self = (ImageView *) super(View, self, initWithFrame, frame);
  if (self) {
    self->blend.src = SDL_GPU_BLENDFACTOR_SRC_ALPHA;
    self->blend.dst = SDL_GPU_BLENDFACTOR_ONE_MINUS_SRC_ALPHA;
 
    self->color = Colors.White;
  }
 
  return self;
}
 
static ImageView *initWithImage(ImageView *self, Image *image) {
 
  self = (ImageView *) $(self, initWithFrame, NULL);
  if (self) {
    $(self, setImage, image);
  }
 
  return self;
}
 
static void setImage(ImageView *self, Image *image) {
 
  free(self->imageName);
  self->imageName = NULL;
 
  release(self->image);
 
  if (image) {
    self->image = retain(image);
 
    const SDL_Size size = $((View *) self, size);
    const SDL_Size imageSize = $(image, size);
 
    if (size.w == 0 && size.h == 0) {
      $((View *) self, resize, &imageSize);
    }
  } else {
    self->image = NULL;
  }
 
  self->texture = release(self->texture);
}
 
static void setImageWithResource(ImageView *self, const Resource *resource) {
 
  Image *image = $$(Image, imageWithResource, resource, 1.f);
 
  $(self, setImage, image);
 
  release(image);
}
 
static void setImageWithResourceName(ImageView *self, const char *name) {
 
  $(self, setImage, NULL);
 
  // an empty name is no image, not a request to ask the resource system for ""
  if (name && *name) {
    self->imageName = strdup(name);
 
    View *this = (View *) self;
    if (this->window) {
      $(this, didMoveToWindow, this->window);
    }
  }
}
 
static void setImageWithSurface(ImageView *self, SDL_Surface *surface) {
 
  $(self, setImage, NULL);
 
  if (surface) {
    Image *image = $(alloc(Image), initWithSurface, surface);
    assert(image);
 
    $(self, setImage, image);
 
    release(image);
  }
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
  ((ViewInterface *) clazz->interface)->awakeWithDictionary = awakeWithDictionary;
  ((ViewInterface *) clazz->interface)->didMoveToWindow = didMoveToWindow;
  ((ViewInterface *) clazz->interface)->init = init;
  ((ViewInterface *) clazz->interface)->render = render;
  ((ViewInterface *) clazz->interface)->renderDeviceWillReset = renderDeviceWillReset;
 
  ((ImageViewInterface *) clazz->interface)->initWithFrame = initWithFrame;
  ((ImageViewInterface *) clazz->interface)->initWithImage = initWithImage;
  ((ImageViewInterface *) clazz->interface)->setImage = setImage;
  ((ImageViewInterface *) clazz->interface)->setImageWithResource = setImageWithResource;
  ((ImageViewInterface *) clazz->interface)->setImageWithResourceName = setImageWithResourceName;
  ((ImageViewInterface *) clazz->interface)->setImageWithSurface = setImageWithSurface;
}
 
Class *_ImageView(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "ImageView",
      .superclass = _View(),
      .instanceSize = sizeof(ImageView),
      .interfaceSize = sizeof(ImageViewInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class