examples/pixman-tbm-helper.c

   1 #include <assert.h>
   2
   3 #include "pixman-tbm-helper.h"
   4
   5 static uint32_t convert_tbm_format_to_pixman(uint32_t fmt);
   6 static void destroy_tbm_pixman_image(pixman_image_t *image, void *data);
   7
   8 pixman_image_t *
   9 pixman_image_from_tbm_surface(tbm_surface_h surface,
  10         enum ds_buffer_data_ptr_access_flag access_flag)
  11 {
  12     pixman_image_t *image;
  13     tbm_surface_info_s info;
  14     uint32_t format;
  15     int tbm_access_flag = 0;
  16     int width, height;
  17     int ret;
  18
  19     width = tbm_surface_get_width(surface);
  20     height = tbm_surface_get_height(surface);
  21
  22     if (access_flag & DS_BUFFER_DATA_PTR_ACCESS_READ)
  23         tbm_access_flag |= TBM_OPTION_READ;
  24     if (access_flag & DS_BUFFER_DATA_PTR_ACCESS_WRITE)
  25         tbm_access_flag |= TBM_OPTION_WRITE;
  26
  27     ret = tbm_surface_map(surface, tbm_access_flag, &info);
  28     assert(ret == TBM_SURFACE_ERROR_NONE);
  29
  30     format = convert_tbm_format_to_pixman(info.format);
  31     image = pixman_image_create_bits(format, width, height,
  32             (uint32_t *)info.planes[0].ptr,
  33             info.planes[0].stride);
  34     assert(image);
  35
  36     tbm_surface_internal_ref(surface);
  37
  38     pixman_image_set_destroy_function(image,
  39             destroy_tbm_pixman_image, surface);
  40
  41     return image;
  42 }
  43
  44 static void
  45 destroy_tbm_pixman_image(pixman_image_t *image, void *data)
  46 {
  47     tbm_surface_h surface = data;
  48
  49     tbm_surface_unmap(surface);
  50     tbm_surface_internal_unref(surface);
  51 }
  52
  53 static uint32_t
  54 convert_tbm_format_to_pixman(uint32_t fmt)
  55 {
  56     switch (fmt) {
  57         case TBM_FORMAT_XRGB8888:
  58             return PIXMAN_x8r8g8b8;
  59         case TBM_FORMAT_ARGB8888:
  60             return PIXMAN_a8r8g8b8;
  61         default:
  62             assert(0 && "not reached");
  63     }
  64 }