tiffread/src/main.c

#include "aliases.h"
#include "image.h"
#include "mem_arena.h"
#include "tiffread.h"
#include <SDL2/SDL.h>
#include <SDL2/SDL_events.h>
#include <SDL2/SDL_render.h>
#include <SDL2/SDL_surface.h>
#include <SDL2/SDL_video.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAIN_ARENA_CAPACITY 30 * 1024 * 1024

#define WINDOW_WIDTH 800
#define WINDOW_HEIGHT 600

#define AMASK 0xff000000
#define BMASK 0x00ff0000
#define GMASK 0x0000ff00
#define RMASK 0x000000ff

#define WHITE 0xff

typedef struct point Point;
struct point {
  u32 x;
  u32 y;
};

Point point_from_index(u32 index, u32 w);
void write_debug_ppm6(const Image *img);
SDL_Texture *image_to_texture(SDL_Renderer *renderer, const Image *img);

int main(int argc, char *argv[]) {
  int exit_code = EXIT_SUCCESS;

  Arena *arena = NULL;
  if (!wapp_mem_arena_init(&arena, MAIN_ARENA_CAPACITY)) {
    return EXIT_FAILURE;
  }

  const char *file_to_open = argc > 1 ? argv[1] : "./resources/test.tif";

  Image *img = read_baseline_tiff(file_to_open, arena);
  if (!img) {
    exit_code = EXIT_FAILURE;
    goto MAIN_DESTROY_ARENA;
  }

  write_debug_ppm6(img);

  if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
    exit_code = EXIT_FAILURE;
    goto MAIN_DESTROY_ARENA;
  };

  SDL_Window *window =
      SDL_CreateWindow("Window", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
                       WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_SHOWN);
  if (!window) {
    exit_code = EXIT_FAILURE;
    goto MAIN_QUIT_SDL;
  }

  SDL_Renderer *renderer = SDL_CreateRenderer(
      window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
  if (!renderer) {
    exit_code = EXIT_FAILURE;
    goto MAIN_DESTROY_WINDOW;
  }

  SDL_Texture *texture = image_to_texture(renderer, img);
  if (!texture) {
    exit_code = EXIT_FAILURE;
    goto MAIN_DESTROY_RENDERER;
  }

  SDL_Rect dest = {
      .h = img->height,
      .w = img->width,
      .x = (WINDOW_WIDTH - img->width) / 2,
      .y = (WINDOW_HEIGHT - img->height) / 2,
  };

  bool running = true;

  SDL_Event event = {0};

  while (running) {
    while (SDL_PollEvent(&event)) {
      switch (event.type) {
      case SDL_QUIT:
        running = false;
        break;
      }
    }

    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);

    SDL_RenderClear(renderer);

    SDL_RenderCopy(renderer, texture, NULL, &dest);

    SDL_RenderPresent(renderer);
  }

  SDL_DestroyTexture(texture);

MAIN_DESTROY_RENDERER:
  SDL_DestroyRenderer(renderer);

MAIN_DESTROY_WINDOW:
  SDL_DestroyWindow(window);

MAIN_QUIT_SDL:
  SDL_Quit();

MAIN_DESTROY_ARENA:
  wapp_mem_arena_destroy(&arena);

  return exit_code;
}

Point point_from_index(u32 index, u32 w) {
  Point out = {0};

  out.x = index % w;

  out.y = (index - (index % w)) / w;

  return out;
}

void write_debug_ppm6(const Image *img) {
  FILE *out = fopen("test.ppm", "wb");

  char magic[] = {'P', '6', '\n'};
  fwrite(magic, sizeof(magic), 1, out);

  char size[128];
  sprintf(size, "%lu %lu\n", img->width, img->height);
  u64 size_length = strlen(size);
  fwrite(size, size_length, 1, out);

  char max[] = {'2', '5', '5', '\n'};
  fwrite(max, sizeof(max), 1, out);

  for (u64 i = 0; i < img->pixel_count; ++i) {
    fwrite(&(img->data[i]), sizeof(u8), 3, out);
  }

  fclose(out);
}

SDL_Texture *image_to_texture(SDL_Renderer *renderer, const Image *img) {
  SDL_Texture *output = NULL;
  if (!renderer || !img) {
    goto IMAGE_TO_TEXTURE_RETURN;
  }

  SDL_Surface *surface = SDL_CreateRGBSurface(0, img->width, img->height, 32,
                                              RMASK, GMASK, BMASK, AMASK);
  if (!surface) {
    goto IMAGE_TO_TEXTURE_RETURN;
  }

  SDL_LockSurface(surface);
  u64 position = 0;
  for (u64 i = 0; i < img->pixel_count; i += surface->w) {
    void *start = (void *)((uptr)(surface->pixels) + position);

    memcpy(start, &(img->data[i]), surface->w * sizeof(Pixel));

    position += surface->pitch;
  }
  SDL_UnlockSurface(surface);

  output = SDL_CreateTextureFromSurface(renderer, surface);

  SDL_FreeSurface(surface);

IMAGE_TO_TEXTURE_RETURN:
  return output;
}