static gboolean apply_resize(resize_settings settings, image_output out)
{
gboolean success = FALSE;
gint orig_w, orig_h, final_w, final_h, view_w, view_h;
gdouble orig_res_x, orig_res_y;
if (settings->change_res) {
success = gimp_image_get_resolution(
out->image_id,
&orig_res_x,
&orig_res_y
);
if ((settings->new_res_x != orig_res_x) || (settings->new_res_y != orig_res_y)) {
// change resolution
success = gimp_image_set_resolution(
out->image_id,
settings->new_res_x,
settings->new_res_y
);
}
}
orig_w = gimp_image_width(out->image_id);
orig_h = gimp_image_height(out->image_id);
if (settings->resize_mode == RESIZE_PERCENT) {
if (settings->stretch_mode == STRETCH_ASPECT) {
gdouble newpct = min(settings->new_w_pc, settings->new_h_pc);
final_w = view_w = round((orig_w * newpct) / 100.0);
final_h = view_h = round((orig_h * newpct) / 100.0);
}
else if (settings->stretch_mode == STRETCH_PADDED) {
gdouble newpct = min(settings->new_w_pc, settings->new_h_pc);
final_w = round((orig_w * newpct) / 100.0);
final_h = round((orig_h * newpct) / 100.0);
view_w = round((orig_w * settings->new_w_pc) / 100.0);
view_h = round((orig_h * settings->new_h_pc) / 100.0);
}
else {
final_w = view_w = round((orig_w * settings->new_w_pc) / 100.0);
final_h = view_h = round((orig_h * settings->new_h_pc) / 100.0);
}
}
else {
// user typed exact pixel size
if (settings->resize_mode == RESIZE_PIXEL_WIDTH) {
view_w = settings->new_w_px; // width is fixed
if (settings->stretch_mode == STRETCH_ASPECT) {
final_w = view_w;
final_h = view_h = round(((float)final_w * orig_h) / orig_w);
}
else if (settings->stretch_mode == STRETCH_PADDED) {
final_w = min(view_w, orig_w);
final_h = round(((float)final_w * orig_h) / orig_w);
view_h = max(orig_h, final_h);
}
else {
final_w = view_w;
final_h = view_h = orig_h;
}
}
else if (settings->resize_mode == RESIZE_PIXEL_HEIGHT) {
view_h = settings->new_h_px; // height is fixed
if (settings->stretch_mode == STRETCH_ASPECT) {
final_h = view_h;
final_w = view_w = round(((float)final_h * orig_w) / orig_h);
}
else if (settings->stretch_mode == STRETCH_PADDED) {
final_h = min(view_h, orig_h);
final_w = round(((float)final_h * orig_w) / orig_h);
view_w = max(orig_w, final_w);
}
else {
final_h = view_h;
final_w = view_w = orig_w;
}
}
else {
// both dimensions are defined
if (settings->stretch_mode == STRETCH_ASPECT) {
// Find which new dimension is the smallest percentage of the existing image dimension
gdouble newwpct = (float)settings->new_w_px / (float)orig_w;
gdouble newhpct = (float)settings->new_h_px / (float)orig_h;
gdouble newpct = min(newwpct, newhpct);
final_w = view_w = round(orig_w * newpct);
final_h = view_h = round(orig_h * newpct);
}
else if (settings->stretch_mode == STRETCH_PADDED) {
// Find which new dimension is the smallest percentage of the existing image dimension
gdouble newwpct = (float)settings->new_w_px / (float)orig_w;
gdouble newhpct = (float)settings->new_h_px / (float)orig_h;
gdouble newpct = min(newwpct, newhpct);
final_w = round(orig_w * newpct);
final_h = round(orig_h * newpct);
view_w = round(orig_w * newwpct);
view_h = round(orig_h * newhpct);
}
else {
final_w = view_w = settings->new_w_px;
final_h = view_h = settings->new_h_px;
}
}
}
// do resize
#if USE_API26
success = gimp_image_scale_full (
out->image_id,
final_w,
final_h,
settings->interpolation
);
#else
// starting from 2.8, gimp_image_scale_full is deprecated.
// use gimp_image_scale instead
GimpInterpolationType old_interpolation;
old_interpolation = gimp_context_get_interpolation();
success = gimp_context_set_interpolation (settings->interpolation);
success = gimp_image_scale (
out->image_id,
final_w,
final_h
);
success = gimp_context_set_interpolation (old_interpolation);
#endif
// add a padding if requested
if (settings->stretch_mode == STRETCH_PADDED) {
// the padding will be drawn using a coloured layer at the bottom of the image
gint32 layerId = gimp_layer_new(
out->image_id,
"padding_layer",
view_w, view_h,
GIMP_RGBA_IMAGE,
(settings->padding_color_alpha / (float)G_MAXUINT16) * 100,
GIMP_NORMAL_MODE
);
#if USE_API26
gimp_image_add_layer (
out->image_id,
layerId,
0
);
gimp_image_lower_layer_to_bottom(out->image_id, layerId);
#else
gimp_image_insert_layer(
out->image_id,
layerId,
0,
0
);
gimp_image_lower_item_to_bottom(out->image_id, layerId);
#endif
// fill it with the selected color
GimpRGB old_background, new_background;
gimp_context_get_background(&old_background);
gimp_rgb_parse_hex (&new_background, gdk_color_to_string(&(settings->padding_color)), strlen(gdk_color_to_string(&(settings->padding_color))));
gimp_context_set_background(&new_background);
gimp_drawable_fill(layerId, GIMP_BACKGROUND_FILL);
gimp_context_set_background(&old_background);
// move it to the center
gimp_layer_translate(layerId, -abs(view_w - final_w) / 2, -abs(view_h - final_h) / 2);
// finish changing the canvas size accordingly
success = gimp_image_resize_to_layers(out->image_id);
}
return success;
}
static gboolean apply_resize(resize_settings settings, image_output out)
{
gboolean success = FALSE;
gint final_w, final_h;
gdouble orig_res_x, orig_res_y;
if (settings->change_res) {
success = gimp_image_get_resolution(
out->image_id,
&orig_res_x,
&orig_res_y
);
if ((settings->new_res_x != orig_res_x) || (settings->new_res_y != orig_res_y)) {
/* change resolution */
success = gimp_image_set_resolution(
out->image_id,
settings->new_res_x,
settings->new_res_y
);
}
}
if (settings->resize_mode == RESIZE_PERCENT) {
/* user selected a percentage of the original size */
final_w = round((gimp_image_width(out->image_id) * settings->new_w_pc) / 100.0);
final_h = round((gimp_image_height(out->image_id) * settings->new_h_pc) / 100.0);
}
else {
/* user typed exact pixel size */
if (settings->resize_mode == RESIZE_PIXEL_WIDTH) {
/* width only */
final_w = settings->new_w_px;
if (settings->aspect_ratio) {
/* and maintain aspect ratio */
final_h = round(((float)settings->new_w_px * gimp_image_height(out->image_id)) / gimp_image_width(out->image_id));
}
else {
final_h = gimp_image_height(out->image_id);
}
}
else if (settings->resize_mode == RESIZE_PIXEL_HEIGHT) {
/* height only */
final_h = settings->new_h_px;
if (settings->aspect_ratio) {
/* and maintain aspect ratio */
final_w = round(((float)settings->new_h_px * gimp_image_width(out->image_id)) / gimp_image_height(out->image_id));
}
else {
final_w = gimp_image_width(out->image_id);
}
}
else {
/* both dimensions are defined */
if (settings->aspect_ratio) {
// Find which new dimension is the smallest percentage of the existing image dimension
gdouble newwpct = (float)settings->new_w_px / (float)gimp_image_width(out->image_id);
gdouble newhpct = (float)settings->new_h_px / (float)gimp_image_height(out->image_id);
gdouble newpct = (newwpct < newhpct) ? newwpct : newhpct;
final_w = round((float)gimp_image_width(out->image_id) * newpct);
final_h = round((float)gimp_image_height(out->image_id) * newpct);
}
else {
final_w = settings->new_w_px;
final_h = settings->new_h_px;
}
}
}
/* do resize */
#if defined _WIN32 || (!defined _WIN32 && (GIMP_MAJOR_VERSION == 2) && (GIMP_MINOR_VERSION <= 6))
success = gimp_image_scale_full (
out->image_id,
final_w,
final_h,
settings->interpolation
);
#else
/* starting from 2.8, gimp_image_scale_full is deprecated.
* use gimp_image_scale instead */
GimpInterpolationType oldInterpolation;
oldInterpolation = gimp_context_get_interpolation();
success = gimp_context_set_interpolation (settings->interpolation);
success = gimp_image_scale (
out->image_id,
final_w,
final_h
);
success = gimp_context_set_interpolation (oldInterpolation);
#endif
return success;
}
