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/* See LICENSE file for copyright and license details. */
#include "common.h"
enum transformation trans = TRANS_NONE;
static GdkPixbuf *
make_negative(GdkPixbuf *image)
{
GdkPixbuf *new_image;
uint8_t *pixels;
int width, height, rowstride, channels, x, y;
new_image = gdk_pixbuf_copy(image);
if (!new_image)
exit(1);
pixels = gdk_pixbuf_get_pixels(new_image);
width = gdk_pixbuf_get_width(new_image);
height = gdk_pixbuf_get_height(new_image);
rowstride = gdk_pixbuf_get_rowstride(new_image);
channels = gdk_pixbuf_get_n_channels(new_image);
for (y = 0; y < height; y++) {
for (x = 0; x < width * channels; x += channels) {
/* TODO
* use libcolour to convert to CIE LChuv
* (or CIE LChab which isn't supported yet),
* then invert the lightness and the hue
* and then convert back to sRGB; however
* we must account for the fact that some
* pixels may be out of gamut
*
* TODO
* this may be a bit slow, so we to use
* opencl if available and otherwise use
* libcolour_convert_en_masse as much as
* possible and cache the negative for
* each file
*
* TODO
* it shall be a configuration in Prefernces
* what model is used for colour inversion
*/
pixels[x + 0] = 255 - pixels[x + 0];
pixels[x + 1] = 255 - pixels[x + 1];
pixels[x + 2] = 255 - pixels[x + 2];
}
pixels = &pixels[rowstride];
}
return new_image;
}
static GdkPixbuf *
apply_rotation_and_reflection(GdkPixbuf *image)
{
GdkPixbuf *new_image, *newer_image;
switch (trans & 7u) {
case TRANS_NONE:
return NULL;
case TRANS_CLOCKWISE:
new_image = gdk_pixbuf_rotate_simple(image, GDK_PIXBUF_ROTATE_CLOCKWISE);
break;
case TRANS_180_DEGREES:
new_image = gdk_pixbuf_rotate_simple(image, GDK_PIXBUF_ROTATE_UPSIDEDOWN);
break;
case TRANS_ANTICLOCKWISE:
new_image = gdk_pixbuf_rotate_simple(image, GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE);
break;
case TRANS_FLIP:
case TRANS_TRANSPOSE:
new_image = gdk_pixbuf_flip(image, 0);
break;
case TRANS_FLOP:
case TRANS_ANTITRANSPOSE:
new_image = gdk_pixbuf_flip(image, 1);
break;
}
if (!new_image)
exit(1);
switch (trans & 7u) {
case TRANS_TRANSPOSE:
case TRANS_ANTITRANSPOSE:
newer_image = gdk_pixbuf_rotate_simple(new_image, GDK_PIXBUF_ROTATE_CLOCKWISE);
if (!newer_image)
exit(1);
g_object_unref(new_image);
return newer_image;
default:
return new_image;
}
}
GdkPixbuf *
apply_transformations(GdkPixbuf *image)
{
GdkPixbuf *negative_image, *new_image;
negative_image = (trans & TRANS_NEGATIVE) ? make_negative(image) : NULL;
new_image = apply_rotation_and_reflection(negative_image ? negative_image : image);
if (!new_image)
new_image = negative_image ? negative_image : image;
else if (negative_image)
g_object_unref(negative_image);
return new_image == image ? NULL : new_image;
}
static enum transformation
inverse_transformation(enum transformation t)
{
return ((4u - t) & 3u) | (t & ~3u);
}
enum transformation
reset_transformations_without_redraw(void)
{
enum transformation augment = inverse_transformation(trans & 7u);
trans &= ~7u;
return augment;
}
int
add_transformation_without_redraw(enum transformation augment)
{
enum transformation old = trans;
if (augment & TRANS_TRANSPOSE)
trans = ((augment - trans) & 3u) | ((augment ^ trans) & ~3u);
else
trans = ((augment + trans) & 3u) | ((augment ^ trans) & ~3u);
return trans != old;
}
void
transform_point(enum transformation t, double *x, double *y, double *w, double *h)
{
double x1 = *x, y1 = *y, x2 = *w, y2 = *h;
switch (t & 7u) {
case TRANS_NONE:
return;
case TRANS_CLOCKWISE:
*x = y2 - y1;
*y = x1;
break;
case TRANS_180_DEGREES:
*x = x2 - x1;
*y = y2 - y1;
return;
case TRANS_ANTICLOCKWISE:
*x = y1;
*y = x2 - x1;
break;
case TRANS_TRANSPOSE:
*x = y1;
*y = x1;
break;
case TRANS_FLIP:
*y = y2 - y1;
return;
case TRANS_ANTITRANSPOSE:
*x = y2 - y1;
*y = x2 - x1;
break;
case TRANS_FLOP:
*x = x2 - x1;
return;
}
*w = y2;
*h = x2;
}
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