images/io-main.h

   1 #ifndef _IMAGES_IO_MAIN_H
   2 #define _IMAGES_IO_MAIN_H
   3
   4 int libjpeg_read_header(struct image_io *io);
   5 int libjpeg_read_data(struct image_io *io);
   6 int libjpeg_write(struct image_io *io);
   7
   8 int libpng_read_header(struct image_io *io);
   9 int libpng_read_data(struct image_io *io);
  10 int libpng_write(struct image_io *io);
  11
  12 int libungif_read_header(struct image_io *io);
  13 int libungif_read_data(struct image_io *io);
  14
  15 int libmagick_read_header(struct image_io *io);
  16 int libmagick_read_data(struct image_io *io);
  17 int libmagick_write(struct image_io *io);
  18
  19 struct image_io_read_data_internals {
  20   struct image *image;
  21   int need_scale;
  22   int need_destroy;
  23 };
  24
  25 static inline struct image *
  26 image_io_read_data_prepare(struct image_io_read_data_internals *rdi, struct image_io *io, uns cols, uns rows)
  27 {
  28   rdi->need_scale = io->cols != cols | io->rows != rows;
  29   rdi->need_destroy = rdi->need_scale || !io->pool;
  30   return rdi->image = rdi->need_scale ?
  31     image_new(io->thread, cols, rows, io->flags & IMAGE_CHANNELS_FORMAT, NULL) :
  32     image_new(io->thread, io->cols, io->rows, io->flags & IMAGE_IO_IMAGE_FLAGS, io->pool);
  33 }
  34
  35 static inline int
  36 image_io_read_data_finish(struct image_io_read_data_internals *rdi, struct image_io *io)
  37 {
  38   if (rdi->need_scale)
  39     {
  40       struct image *img = image_new(io->thread, io->cols, io->rows, io->flags & IMAGE_IO_IMAGE_FLAGS, io->pool);
  41       if (unlikely(!img))
  42         {
  43           if (rdi->need_destroy)
  44             image_destroy(rdi->image);
  45           return 0;
  46         }
  47       if (unlikely(!image_scale(io->thread, img, rdi->image)))
  48         {
  49           image_destroy(rdi->image);
  50           if (!io->pool)
  51             image_destroy(img);
  52           return 0;
  53         }
  54       io->image = img;
  55       io->image_destroy = !io->pool;
  56     }
  57   else
  58     {
  59       io->image = rdi->image;
  60       io->image_destroy = rdi->need_destroy;
  61     }
  62   return 1;
  63 }
  64
  65 static inline void
  66 image_io_read_data_break(struct image_io_read_data_internals *rdi, struct image_io *io UNUSED)
  67 {
  68   if (rdi->need_destroy)
  69     image_destroy(rdi->image);
  70 }
  71
  72 #endif