thumbs_font.cc

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/* SPDX-FileCopyrightText: 2024 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "BLI_hash_md5.hh"
 
#include "IMB_imbuf.hh"
#include "IMB_imbuf_types.hh"
 
#include "IMB_thumbs.hh" /* own include. */
 
/* XXX, bad level call */
#include "../../blenfont/BLF_api.hh"
 
/* Only change if we need to update the previews in the on-disk cache. */
#define FONT_THUMB_VERSION "1.0.1"
 
ImBuf *IMB_thumb_load_font(const char *filepath, uint x, uint y)
{
  ImBuf *ibuf = IMB_allocImBuf(x, y, 32, IB_byte_data | IB_metadata);
 
  /* fill with white and zero alpha */
  const float col[4] = {1.0f, 1.0f, 1.0f, 0.0f};
  IMB_rectfill(ibuf, col);
 
  if (!BLF_thumb_preview(filepath, ibuf->byte_buffer.data, ibuf->x, ibuf->y, ibuf->channels)) {
    IMB_freeImBuf(ibuf);
    ibuf = nullptr;
  }
 
  return ibuf;
}
 
bool IMB_thumb_load_font_get_hash(char *r_hash)
{
  uchar digest[16];
  BLI_hash_md5_buffer(FONT_THUMB_VERSION, sizeof(FONT_THUMB_VERSION), digest);
  r_hash[0] = '\0';
  BLI_hash_md5_to_hexdigest(digest, r_hash);
 
  return true;
}
 
ImBuf *IMB_font_preview(const char *filepath, uint width, const float color[4])
{
  int font_id = (filepath[0] != '<') ? BLF_load(filepath) : 0;
  if (font_id == -1) {
    return nullptr;
  }
  const char sample[] = "ABCDEFGH\nabcdefg123";
 
  BLF_buffer_col(font_id, color);
 
  BLF_size(font_id, 50.0f);
  BLF_enable(font_id, BLF_WORD_WRAP);
  float name_w;
  float name_h;
  BLF_width_and_height(font_id, sample, sizeof(sample), &name_w, &name_h);
  float scale = float(width) / name_w;
  BLF_size(font_id, scale * 50.0f);
  name_w *= scale;
  name_h *= scale;
 
  int height = int(name_h * 1.3f);
  ImBuf *ibuf = IMB_allocImBuf(width, height, 32, IB_byte_data);
  /* fill with white and zero alpha */
  const float col[4] = {1.0f, 1.0f, 1.0f, 0.0f};
  IMB_rectfill(ibuf, col);
 
  BLF_buffer(font_id, ibuf->float_buffer.data, ibuf->byte_buffer.data, width, height, nullptr);
 
  BLF_position(font_id, 0.0f, name_h * 0.8f, 0.0f);
  BLF_draw_buffer(font_id, sample, 1024);
 
  BLF_buffer(font_id, nullptr, nullptr, 0, 0, nullptr);
 
  if (font_id != 0) {
    BLF_unload_id(font_id);
  }
 
  return ibuf;
}