+
+void OPJ_CALLCONV opj_image_header_destroy(opj_image_header_t *image_header) {
+ if(image_header) {
+ if(image_header->comps) {
+ /* image components */
+ opj_free(image_header->comps);
+ }
+ if(image_header->icc_profile_buf) {
+ opj_free(image_header->icc_profile_buf);
+ }
+ opj_free(image_header);
+ }
+}
+
+/**
+ * Updates the components characteristics of the image from the coding parameters.
+ *
+ * @param p_image_header the image header to update.
+ * @param p_cp the coding parameters from which to update the image.
+ */
+void opj_image_comp_header_update(opj_image_header_t * p_image_header, const opj_cp_v2_t * p_cp)
+{
+ OPJ_UINT32 i, l_width, l_height;
+ OPJ_INT32 l_x0, l_y0, l_x1, l_y1;
+ OPJ_INT32 l_comp_x0, l_comp_y0, l_comp_x1, l_comp_y1;
+ opj_image_comp_header_t* l_img_comp = NULL;
+
+ l_x0 = int_max(p_cp->tx0 , p_image_header->x0);
+ l_y0 = int_max(p_cp->ty0 , p_image_header->y0);
+ l_x1 = int_min(p_cp->tx0 + p_cp->tw * p_cp->tdx, p_image_header->x1);
+ l_y1 = int_min(p_cp->ty0 + p_cp->th * p_cp->tdy, p_image_header->y1);
+
+ l_img_comp = p_image_header->comps;
+ for (i = 0; i < p_image_header->numcomps; ++i) {
+ l_comp_x0 = int_ceildiv(l_x0, l_img_comp->dx);
+ l_comp_y0 = int_ceildiv(l_y0, l_img_comp->dy);
+ l_comp_x1 = int_ceildiv(l_x1, l_img_comp->dx);
+ l_comp_y1 = int_ceildiv(l_y1, l_img_comp->dy);
+ l_width = int_ceildivpow2(l_comp_x1 - l_comp_x0, l_img_comp->factor);
+ l_height = int_ceildivpow2(l_comp_y1 - l_comp_y0, l_img_comp->factor);
+ l_img_comp->w = l_width;
+ l_img_comp->h = l_height;
+ l_img_comp->x0 = l_x0;
+ l_img_comp->y0 = l_y0;
+ ++l_img_comp;
+ }
+}
+