static gpointer
rotate_right_exec (GthAsyncTask *task,
gpointer user_data)
{
cairo_surface_t *source;
cairo_surface_t *destination;
source = gth_image_task_get_source_surface (GTH_IMAGE_TASK (task));
destination = _cairo_image_surface_transform (source, GTH_TRANSFORM_ROTATE_90);
gth_image_task_set_destination_surface (GTH_IMAGE_TASK (task), destination);
cairo_surface_destroy (destination);
cairo_surface_destroy (source);
return NULL;
}
static gpointer
resize_task_exec (GthAsyncTask *task,
gpointer user_data)
{
GthFileToolResize *self = user_data;
cairo_surface_t *source;
cairo_surface_t *destination;
source = gth_image_task_get_source_surface (GTH_IMAGE_TASK (task));
destination = _cairo_image_surface_scale (source,
self->priv->new_width,
self->priv->new_height,
(self->priv->high_quality ? SCALE_FILTER_BEST : SCALE_FILTER_FAST),
task);
_cairo_image_surface_clear_metadata (destination);
gth_image_task_set_destination_surface (GTH_IMAGE_TASK (task), destination);
cairo_surface_destroy (destination);
cairo_surface_destroy (source);
return NULL;
}
static gpointer
adjust_contrast_exec (GthAsyncTask *task,
gpointer user_data)
{
EqualizeData *equalize_data = user_data;
cairo_surface_t *source;
cairo_format_t format;
int width;
int height;
int source_stride;
cairo_surface_t *destination;
int destination_stride;
unsigned char *p_source_line;
unsigned char *p_destination_line;
unsigned char *p_source;
unsigned char *p_destination;
gboolean cancelled;
double progress;
int x, y, temp;
unsigned char red, green, blue, alpha;
/* initialize the extra data */
source = gth_image_task_get_source_surface (GTH_IMAGE_TASK (task));
adjust_contrast_setup (equalize_data, source);
/* convert the image */
format = cairo_image_surface_get_format (source);
width = cairo_image_surface_get_width (source);
height = cairo_image_surface_get_height (source);
source_stride = cairo_image_surface_get_stride (source);
destination = cairo_image_surface_create (format, width, height);
destination_stride = cairo_image_surface_get_stride (destination);
p_source_line = _cairo_image_surface_flush_and_get_data (source);
p_destination_line = _cairo_image_surface_flush_and_get_data (destination);
for (y = 0; y < height; y++) {
gth_async_task_get_data (task, NULL, &cancelled, NULL);
if (cancelled) {
cairo_surface_destroy (destination);
cairo_surface_destroy (source);
return NULL;
}
progress = (double) y / height;
gth_async_task_set_data (task, NULL, NULL, &progress);
p_source = p_source_line;
p_destination = p_destination_line;
for (x = 0; x < width; x++) {
CAIRO_GET_RGBA (p_source, red, green, blue, alpha);
red = adjust_contrast_func (equalize_data, GTH_HISTOGRAM_CHANNEL_RED, red);
green = adjust_contrast_func (equalize_data, GTH_HISTOGRAM_CHANNEL_GREEN, green);
blue = adjust_contrast_func (equalize_data, GTH_HISTOGRAM_CHANNEL_BLUE, blue);
CAIRO_SET_RGBA (p_destination, red, green, blue, alpha);
p_source += 4;
p_destination += 4;
}
p_source_line += source_stride;
p_destination_line += destination_stride;
}
cairo_surface_mark_dirty (destination);
gth_image_task_set_destination_surface (GTH_IMAGE_TASK (task), destination);
cairo_surface_destroy (destination);
cairo_surface_destroy (source);
return NULL;
}
static gpointer
grayscale_exec (GthAsyncTask *task,
gpointer user_data)
{
GrayscaleData *grayscale_data = user_data;
cairo_surface_t *source;
cairo_format_t format;
int width;
int height;
int source_stride;
cairo_surface_t *destination;
int destination_stride;
unsigned char *p_source_line;
unsigned char *p_destination_line;
unsigned char *p_source;
unsigned char *p_destination;
gboolean cancelled;
double progress;
int x, y;
unsigned char red, green, blue, alpha;
unsigned char min, max, value;
source = gth_image_task_get_source_surface (GTH_IMAGE_TASK (task));
format = cairo_image_surface_get_format (source);
width = cairo_image_surface_get_width (source);
height = cairo_image_surface_get_height (source);
source_stride = cairo_image_surface_get_stride (source);
destination = cairo_image_surface_create (format, width, height);
destination_stride = cairo_image_surface_get_stride (destination);
p_source_line = _cairo_image_surface_flush_and_get_data (source);
p_destination_line = _cairo_image_surface_flush_and_get_data (destination);
for (y = 0; y < height; y++) {
gth_async_task_get_data (task, NULL, &cancelled, NULL);
if (cancelled)
return NULL;
progress = (double) y / height;
gth_async_task_set_data (task, NULL, NULL, &progress);
p_source = p_source_line;
p_destination = p_destination_line;
for (x = 0; x < width; x++) {
CAIRO_GET_RGBA (p_source, red, green, blue, alpha);
switch (grayscale_data->method) {
case METHOD_BRIGHTNESS:
value = (0.2125 * red + 0.7154 * green + 0.072 * blue);
break;
case METHOD_SATURATION:
max = MAX (MAX (red, green), blue);
min = MIN (MIN (red, green), blue);
value = (max + min) / 2;
break;
case METHOD_AVARAGE:
value = (0.3333 * red + 0.3333 * green + 0.3333 * blue);
break;
default:
g_assert_not_reached ();
}
CAIRO_SET_RGBA (p_destination,
value,
value,
value,
alpha);
p_source += 4;
p_destination += 4;
}
p_source_line += source_stride;
p_destination_line += destination_stride;
}
cairo_surface_mark_dirty (destination);
gth_image_task_set_destination_surface (GTH_IMAGE_TASK (task), destination);
cairo_surface_destroy (destination);
cairo_surface_destroy (source);
return NULL;
}
static gpointer
negative_exec (GthAsyncTask *task,
gpointer user_data)
{
cairo_surface_t *source;
cairo_format_t format;
int width;
int height;
int source_stride;
cairo_surface_t *destination;
int destination_stride;
unsigned char *p_source_line;
unsigned char *p_destination_line;
unsigned char *p_source;
unsigned char *p_destination;
gboolean cancelled;
double progress;
int x, y;
unsigned char red, green, blue, alpha;
source = gth_image_task_get_source_surface (GTH_IMAGE_TASK (task));
format = cairo_image_surface_get_format (source);
width = cairo_image_surface_get_width (source);
height = cairo_image_surface_get_height (source);
source_stride = cairo_image_surface_get_stride (source);
destination = cairo_image_surface_create (format, width, height);
destination_stride = cairo_image_surface_get_stride (destination);
p_source_line = _cairo_image_surface_flush_and_get_data (source);
p_destination_line = _cairo_image_surface_flush_and_get_data (destination);
for (y = 0; y < height; y++) {
gth_async_task_get_data (task, NULL, &cancelled, NULL);
if (cancelled)
return NULL;
progress = (double) y / height;
gth_async_task_set_data (task, NULL, NULL, &progress);
p_source = p_source_line;
p_destination = p_destination_line;
for (x = 0; x < width; x++) {
CAIRO_GET_RGBA (p_source, red, green, blue, alpha);
CAIRO_SET_RGBA (p_destination,
255 - red,
255 - green,
255 - blue,
alpha);
p_source += 4;
p_destination += 4;
}
p_source_line += source_stride;
p_destination_line += destination_stride;
}
cairo_surface_mark_dirty (destination);
gth_image_task_set_destination_surface (GTH_IMAGE_TASK (task), destination);
cairo_surface_destroy (destination);
cairo_surface_destroy (source);
return NULL;
}
