/**
* gdk_pixbuf_copy:
* @pixbuf: A pixbuf.
*
* Creates a new #GdkPixbuf with a copy of the information in the specified
* @pixbuf. Note that this does not copy the options set on the original #GdkPixbuf,
* use gdk_pixbuf_copy_options() for this.
*
* Return value: (nullable) (transfer full): A newly-created pixbuf with a reference count of 1, or %NULL if
* not enough memory could be allocated.
**/
GdkPixbuf *
gdk_pixbuf_copy (const GdkPixbuf *pixbuf)
{
guchar *buf;
int size;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
/* Calculate a semi-exact size. Here we copy with full rowstrides;
* maybe we should copy each row individually with the minimum
* rowstride?
*/
size = gdk_pixbuf_get_byte_length (pixbuf);
buf = g_try_malloc (size);
if (!buf)
return NULL;
memcpy (buf, gdk_pixbuf_read_pixels (pixbuf), size);
return gdk_pixbuf_new_from_data (buf,
pixbuf->colorspace, pixbuf->has_alpha,
pixbuf->bits_per_sample,
pixbuf->width, pixbuf->height,
pixbuf->rowstride,
free_buffer,
NULL);
}
/**
* gdk_pixbuf_scale:
* @src: a #GdkPixbuf
* @dest: the #GdkPixbuf into which to render the results
* @dest_x: the left coordinate for region to render
* @dest_y: the top coordinate for region to render
* @dest_width: the width of the region to render
* @dest_height: the height of the region to render
* @offset_x: the offset in the X direction (currently rounded to an integer)
* @offset_y: the offset in the Y direction (currently rounded to an integer)
* @scale_x: the scale factor in the X direction
* @scale_y: the scale factor in the Y direction
* @interp_type: the interpolation type for the transformation.
*
* Creates a transformation of the source image @src by scaling by
* @scale_x and @scale_y then translating by @offset_x and @offset_y,
* then renders the rectangle (@dest_x, @dest_y, @dest_width,
* @dest_height) of the resulting image onto the destination image
* replacing the previous contents.
*
* Try to use gdk_pixbuf_scale_simple() first, this function is
* the industrial-strength power tool you can fall back to if
* gdk_pixbuf_scale_simple() isn't powerful enough.
*
* If the source rectangle overlaps the destination rectangle on the
* same pixbuf, it will be overwritten during the scaling which
* results in rendering artifacts.
**/
void
gdk_pixbuf_scale (const GdkPixbuf *src,
GdkPixbuf *dest,
int dest_x,
int dest_y,
int dest_width,
int dest_height,
double offset_x,
double offset_y,
double scale_x,
double scale_y,
GdkInterpType interp_type)
{
const guint8 *src_pixels;
guint8 *dest_pixels;
g_return_if_fail (GDK_IS_PIXBUF (src));
g_return_if_fail (GDK_IS_PIXBUF (dest));
g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width);
g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height);
offset_x = floor (offset_x + 0.5);
offset_y = floor (offset_y + 0.5);
/* Force an implicit copy */
dest_pixels = gdk_pixbuf_get_pixels (dest);
src_pixels = gdk_pixbuf_read_pixels (src);
_pixops_scale (dest_pixels, dest->width, dest->height, dest->rowstride,
dest->n_channels, dest->has_alpha, src_pixels, src->width,
src->height, src->rowstride, src->n_channels, src->has_alpha,
dest_x, dest_y, dest_width, dest_height, offset_x, offset_y,
scale_x, scale_y, (PixopsInterpType)interp_type);
}
/**
* gdk_pixbuf_flip:
* @src: a #GdkPixbuf
* @horizontal: %TRUE to flip horizontally, %FALSE to flip vertically
*
* Flips a pixbuf horizontally or vertically and returns the
* result in a new pixbuf.
*
* Returns: (nullable) (transfer full): the new #GdkPixbuf, or %NULL
* if not enough memory could be allocated for it.
*
* Since: 2.6
*/
GdkPixbuf *
gdk_pixbuf_flip (const GdkPixbuf *src,
gboolean horizontal)
{
const guint8 *src_pixels;
guint8 *dest_pixels;
GdkPixbuf *dest;
const guchar *p;
guchar *q;
gint x, y;
g_return_val_if_fail (GDK_IS_PIXBUF (src), NULL);
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->width,
src->height);
if (!dest)
return NULL;
dest_pixels = gdk_pixbuf_get_pixels (dest);
src_pixels = gdk_pixbuf_read_pixels (src);
if (!horizontal) /* flip vertical */
{
for (y = 0; y < dest->height; y++)
{
p = src_pixels + OFFSET (src, 0, y);
q = dest_pixels + OFFSET (dest, 0, dest->height - y - 1);
memcpy (q, p, dest->rowstride);
}
}
else /* flip horizontal */
{
for (y = 0; y < dest->height; y++)
{
for (x = 0; x < dest->width; x++)
{
p = src_pixels + OFFSET (src, x, y);
q = dest_pixels + OFFSET (dest, dest->width - x - 1, y);
memcpy (q, p, dest->n_channels);
}
}
}
return dest;
}
/**
* gdk_pixbuf_composite_color:
* @src: a #GdkPixbuf
* @dest: the #GdkPixbuf into which to render the results
* @dest_x: the left coordinate for region to render
* @dest_y: the top coordinate for region to render
* @dest_width: the width of the region to render
* @dest_height: the height of the region to render
* @offset_x: the offset in the X direction (currently rounded to an integer)
* @offset_y: the offset in the Y direction (currently rounded to an integer)
* @scale_x: the scale factor in the X direction
* @scale_y: the scale factor in the Y direction
* @interp_type: the interpolation type for the transformation.
* @overall_alpha: overall alpha for source image (0..255)
* @check_x: the X offset for the checkboard (origin of checkboard is at -@check_x, -@check_y)
* @check_y: the Y offset for the checkboard
* @check_size: the size of checks in the checkboard (must be a power of two)
* @color1: the color of check at upper left
* @color2: the color of the other check
*
* Creates a transformation of the source image @src by scaling by
* @scale_x and @scale_y then translating by @offset_x and @offset_y,
* then composites the rectangle (@dest_x ,@dest_y, @dest_width,
* @dest_height) of the resulting image with a checkboard of the
* colors @color1 and @color2 and renders it onto the destination
* image.
*
* See gdk_pixbuf_composite_color_simple() for a simpler variant of this
* function suitable for many tasks.
*
**/
void
gdk_pixbuf_composite_color (const GdkPixbuf *src,
GdkPixbuf *dest,
int dest_x,
int dest_y,
int dest_width,
int dest_height,
double offset_x,
double offset_y,
double scale_x,
double scale_y,
GdkInterpType interp_type,
int overall_alpha,
int check_x,
int check_y,
int check_size,
guint32 color1,
guint32 color2)
{
const guint8 *src_pixels;
guint8 *dest_pixels;
g_return_if_fail (GDK_IS_PIXBUF (src));
g_return_if_fail (GDK_IS_PIXBUF (dest));
g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width);
g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height);
g_return_if_fail (overall_alpha >= 0 && overall_alpha <= 255);
offset_x = floor (offset_x + 0.5);
offset_y = floor (offset_y + 0.5);
/* Force an implicit copy */
dest_pixels = gdk_pixbuf_get_pixels (dest);
src_pixels = gdk_pixbuf_read_pixels (src);
_pixops_composite_color (dest_pixels, dest_width, dest_height,
dest->rowstride, dest->n_channels, dest->has_alpha,
src_pixels, src->width, src->height,
src->rowstride, src->n_channels, src->has_alpha,
dest_x, dest_y, dest_width, dest_height, offset_x,
offset_y, scale_x, scale_y,
(PixopsInterpType)interp_type, overall_alpha,
check_x, check_y, check_size, color1, color2);
}
/**
* This function will not work for pixbufs with images that are other than 8 bits
* per sample or channel, but it will work for most of the pixbufs that GTK+ uses.
* @param GdkPixbuf* pixbuf
* @return true is a movement detected or false is none.
*/
gboolean DockItem::isMovementDetected(GdkPixbuf* pixbuf)
{
gint x, y;
int w = gdk_pixbuf_get_width(pixbuf);
int h = gdk_pixbuf_get_height(pixbuf);
int channels = 3; //gdk_pixbuf_get_n_channels(pixbuf);
gint rowstride = gdk_pixbuf_get_rowstride(pixbuf);
gint pixel_offset;
// Returns a read-only pointer to the raw pixel data;
// must not be modified. This function allows skipping the
// implicit copy that must be made if gdk_pixbuf_get_pixels()
// is called on a read-only pixbuf.
const guint8* pixels = gdk_pixbuf_read_pixels(pixbuf);
if (!m_pixbufPreviousPass) {
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
pixel_offset = y * rowstride + x * channels;
this->m_pixelsbuf[pixel_offset] = pixels[ pixel_offset];
}
}
m_pixbufPreviousPass = true;
return FALSE;
}
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
pixel_offset = y * rowstride + x * channels;
if (this->m_pixelsbuf[pixel_offset] != pixels[pixel_offset]) {
m_pixbufPreviousPass = FALSE;
return TRUE;
}
}
}
m_pixbufPreviousPass = FALSE;
return FALSE;
}
/**
* gdk_pixbuf_rotate_simple:
* @src: a #GdkPixbuf
* @angle: the angle to rotate by
*
* Rotates a pixbuf by a multiple of 90 degrees, and returns the
* result in a new pixbuf.
*
* Returns: (nullable) (transfer full): the new #GdkPixbuf, or %NULL
* if not enough memory could be allocated for it.
*
* Since: 2.6
*/
GdkPixbuf *
gdk_pixbuf_rotate_simple (const GdkPixbuf *src,
GdkPixbufRotation angle)
{
const guint8 *src_pixels;
guint8 *dest_pixels;
GdkPixbuf *dest;
const guchar *p;
guchar *q;
gint x, y;
src_pixels = gdk_pixbuf_read_pixels (src);
switch (angle % 360)
{
case 0:
dest = gdk_pixbuf_copy (src);
break;
case 90:
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->height,
src->width);
if (!dest)
return NULL;
dest_pixels = gdk_pixbuf_get_pixels (dest);
for (y = 0; y < src->height; y++)
{
for (x = 0; x < src->width; x++)
{
p = src_pixels + OFFSET (src, x, y);
q = dest_pixels + OFFSET (dest, y, src->width - x - 1);
memcpy (q, p, dest->n_channels);
}
}
break;
case 180:
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->width,
src->height);
if (!dest)
return NULL;
dest_pixels = gdk_pixbuf_get_pixels (dest);
for (y = 0; y < src->height; y++)
{
for (x = 0; x < src->width; x++)
{
p = src_pixels + OFFSET (src, x, y);
q = dest_pixels + OFFSET (dest, src->width - x - 1, src->height - y - 1);
memcpy (q, p, dest->n_channels);
}
}
break;
case 270:
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->height,
src->width);
if (!dest)
return NULL;
dest_pixels = gdk_pixbuf_get_pixels (dest);
for (y = 0; y < src->height; y++)
{
for (x = 0; x < src->width; x++)
{
p = src_pixels + OFFSET (src, x, y);
q = dest_pixels + OFFSET (dest, src->height - y - 1, x);
memcpy (q, p, dest->n_channels);
}
}
break;
default:
dest = NULL;
g_warning ("gdk_pixbuf_rotate_simple() can only rotate "
"by multiples of 90 degrees");
g_assert_not_reached ();
}
return dest;
}
/**
* gdk_pixbuf_add_alpha:
* @pixbuf: A #GdkPixbuf.
* @substitute_color: Whether to set a color to zero opacity. If this
* is %FALSE, then the (@r, @g, @b) arguments will be ignored.
* @r: Red value to substitute.
* @g: Green value to substitute.
* @b: Blue value to substitute.
*
* Takes an existing pixbuf and adds an alpha channel to it.
* If the existing pixbuf already had an alpha channel, the channel
* values are copied from the original; otherwise, the alpha channel
* is initialized to 255 (full opacity).
*
* If @substitute_color is %TRUE, then the color specified by (@r, @g, @b) will be
* assigned zero opacity. That is, if you pass (255, 255, 255) for the
* substitute color, all white pixels will become fully transparent.
*
* Return value: (transfer full): A newly-created pixbuf with a reference count of 1.
**/
GdkPixbuf *
gdk_pixbuf_add_alpha (const GdkPixbuf *pixbuf,
gboolean substitute_color, guchar r, guchar g, guchar b)
{
GdkPixbuf *new_pixbuf;
int x, y;
const guint8 *src_pixels;
guint8 *ret_pixels;
const guchar *src;
guchar *dest;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
g_return_val_if_fail (pixbuf->colorspace == GDK_COLORSPACE_RGB, NULL);
g_return_val_if_fail (pixbuf->n_channels == 3 || pixbuf->n_channels == 4, NULL);
g_return_val_if_fail (pixbuf->bits_per_sample == 8, NULL);
src_pixels = gdk_pixbuf_read_pixels (pixbuf);
if (pixbuf->has_alpha) {
new_pixbuf = gdk_pixbuf_copy (pixbuf);
if (!new_pixbuf)
return NULL;
if (!substitute_color)
return new_pixbuf;
} else {
new_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, pixbuf->width, pixbuf->height);
}
if (!new_pixbuf)
return NULL;
ret_pixels = gdk_pixbuf_get_pixels (new_pixbuf);
for (y = 0; y < pixbuf->height; y++, src_pixels += pixbuf->rowstride, ret_pixels += new_pixbuf->rowstride) {
guchar tr, tg, tb;
src = src_pixels;
dest = ret_pixels;
if (pixbuf->has_alpha) {
/* Just subst color, we already copied everything else */
for (x = 0; x < pixbuf->width; x++) {
if (src[0] == r && src[1] == g && src[2] == b)
dest[3] = 0;
src += 4;
dest += 4;
}
} else {
for (x = 0; x < pixbuf->width; x++) {
tr = *dest++ = *src++;
tg = *dest++ = *src++;
tb = *dest++ = *src++;
if (substitute_color && tr == r && tg == g && tb == b)
*dest++ = 0;
else
*dest++ = 255;
}
}
}
return new_pixbuf;
}
/**
* gdk_pixbuf_saturate_and_pixelate:
* @src: source image
* @dest: place to write modified version of @src
* @saturation: saturation factor
* @pixelate: whether to pixelate
*
* Modifies saturation and optionally pixelates @src, placing the result in
* @dest. @src and @dest may be the same pixbuf with no ill effects. If
* @saturation is 1.0 then saturation is not changed. If it's less than 1.0,
* saturation is reduced (the image turns toward grayscale); if greater than
* 1.0, saturation is increased (the image gets more vivid colors). If @pixelate
* is %TRUE, then pixels are faded in a checkerboard pattern to create a
* pixelated image. @src and @dest must have the same image format, size, and
* rowstride.
*
**/
void
gdk_pixbuf_saturate_and_pixelate(const GdkPixbuf *src,
GdkPixbuf *dest,
gfloat saturation,
gboolean pixelate)
{
/* NOTE that src and dest MAY be the same pixbuf! */
g_return_if_fail (GDK_IS_PIXBUF (src));
g_return_if_fail (GDK_IS_PIXBUF (dest));
g_return_if_fail (gdk_pixbuf_get_height (src) == gdk_pixbuf_get_height (dest));
g_return_if_fail (gdk_pixbuf_get_width (src) == gdk_pixbuf_get_width (dest));
g_return_if_fail (gdk_pixbuf_get_has_alpha (src) == gdk_pixbuf_get_has_alpha (dest));
g_return_if_fail (gdk_pixbuf_get_colorspace (src) == gdk_pixbuf_get_colorspace (dest));
if (saturation == 1.0 && !pixelate) {
if (dest != src)
gdk_pixbuf_copy_area (src, 0, 0,
gdk_pixbuf_get_width (src),
gdk_pixbuf_get_height (src),
dest, 0, 0);
} else {
int i, j, t;
int width, height, has_alpha, src_rowstride, dest_rowstride, bytes_per_pixel;
const guchar *src_line;
guchar *dest_line;
const guchar *src_pixel;
guchar *dest_pixel;
guchar intensity;
has_alpha = gdk_pixbuf_get_has_alpha (src);
bytes_per_pixel = has_alpha ? 4 : 3;
width = gdk_pixbuf_get_width (src);
height = gdk_pixbuf_get_height (src);
src_rowstride = gdk_pixbuf_get_rowstride (src);
dest_rowstride = gdk_pixbuf_get_rowstride (dest);
dest_line = gdk_pixbuf_get_pixels (dest);
src_line = gdk_pixbuf_read_pixels (src);
#define DARK_FACTOR 0.7
#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
#define CLAMP_UCHAR(v) (t = (v), CLAMP (t, 0, 255))
#define SATURATE(v) ((1.0 - saturation) * intensity + saturation * (v))
for (i = 0 ; i < height ; i++) {
src_pixel = src_line;
src_line += src_rowstride;
dest_pixel = dest_line;
dest_line += dest_rowstride;
for (j = 0 ; j < width ; j++) {
intensity = INTENSITY (src_pixel[0], src_pixel[1], src_pixel[2]);
if (pixelate && (i + j) % 2 == 0) {
dest_pixel[0] = intensity / 2 + 127;
dest_pixel[1] = intensity / 2 + 127;
dest_pixel[2] = intensity / 2 + 127;
} else if (pixelate) {
dest_pixel[0] = CLAMP_UCHAR ((SATURATE (src_pixel[0])) * DARK_FACTOR);
dest_pixel[1] = CLAMP_UCHAR ((SATURATE (src_pixel[1])) * DARK_FACTOR);
dest_pixel[2] = CLAMP_UCHAR ((SATURATE (src_pixel[2])) * DARK_FACTOR);
} else {
dest_pixel[0] = CLAMP_UCHAR (SATURATE (src_pixel[0]));
dest_pixel[1] = CLAMP_UCHAR (SATURATE (src_pixel[1]));
dest_pixel[2] = CLAMP_UCHAR (SATURATE (src_pixel[2]));
}
if (has_alpha)
dest_pixel[3] = src_pixel[3];
src_pixel += bytes_per_pixel;
dest_pixel += bytes_per_pixel;
}
}
}
}
cairo_surface_t* gdk_cairo_image_surface_create_from_pixbuf(const GdkPixbuf *gdkbuf) {
int chan = gdk_pixbuf_get_n_channels(gdkbuf);
if (chan < 3) return NULL;
#if GDK_PIXBUF_CHECK_VERSION(2,32,0)
const guint8* gdkpix = gdk_pixbuf_read_pixels(gdkbuf);
#else
const guint8* gdkpix = gdk_pixbuf_get_pixels(gdkbuf);
#endif
if (!gdkpix) {
return NULL;
}
gint w = gdk_pixbuf_get_width(gdkbuf);
gint h = gdk_pixbuf_get_height(gdkbuf);
int stride = gdk_pixbuf_get_rowstride(gdkbuf);
cairo_format_t fmt = (chan == 3) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32;
cairo_surface_t * cs = cairo_image_surface_create (fmt, w, h);
cairo_surface_flush (cs);
if ( !cs || cairo_surface_status(cs) != CAIRO_STATUS_SUCCESS) {
return NULL;
}
int cstride = cairo_image_surface_get_stride(cs);
unsigned char * cpix = cairo_image_surface_get_data(cs);
if (chan == 3) {
int i;
for (i = h; i; --i) {
const guint8 *gp = gdkpix;
unsigned char *cp = cpix;
const guint8* end = gp + 3*w;
while (gp < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
cp[0] = gp[2];
cp[1] = gp[1];
cp[2] = gp[0];
#else
cp[1] = gp[0];
cp[2] = gp[1];
cp[3] = gp[2];
#endif
gp += 3;
cp += 4;
}
gdkpix += stride;
cpix += cstride;
}
} else {
/* premul-color = alpha/255 * color/255 * 255 = (alpha*color)/255
* (z/255) = z/256 * 256/255 = z/256 (1 + 1/255)
* = z/256 + (z/256)/255 = (z + z/255)/256
* # recurse once
* = (z + (z + z/255)/256)/256
* = (z + z/256 + z/256/255) / 256
* # only use 16bit uint operations, loose some precision,
* # result is floored.
* -> (z + z>>8)>>8
* # add 0x80/255 = 0.5 to convert floor to round
* => (z+0x80 + (z+0x80)>>8 ) >> 8
* ------
* tested as equal to lround(z/255.0) for uint z in [0..0xfe02]
*/
#define PREMUL_ALPHA(x,a,b,z) G_STMT_START { z = a * b + 0x80; x = (z + (z >> 8)) >> 8; } G_STMT_END
int i;
for (i = h; i; --i) {
const guint8 *gp = gdkpix;
unsigned char *cp = cpix;
const guint8* end = gp + 4*w;
guint z1, z2, z3;
while (gp < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
PREMUL_ALPHA(cp[0], gp[2], gp[3], z1);
PREMUL_ALPHA(cp[1], gp[1], gp[3], z2);
PREMUL_ALPHA(cp[2], gp[0], gp[3], z3);
cp[3] = gp[3];
#else
PREMUL_ALPHA(cp[1], gp[0], gp[3], z1);
PREMUL_ALPHA(cp[2], gp[1], gp[3], z2);
PREMUL_ALPHA(cp[3], gp[2], gp[3], z3);
cp[0] = gp[3];
#endif
gp += 4;
cp += 4;
}
gdkpix += stride;
cpix += cstride;
}
#undef PREMUL_ALPHA
}
cairo_surface_mark_dirty(cs);
return cs;
}
