static void
cdisplay_lcms_convert_surface (GimpColorDisplay *display,
cairo_surface_t *surface)
{
CdisplayLcms *lcms = CDISPLAY_LCMS (display);
gint width = cairo_image_surface_get_width (surface);
gint height = cairo_image_surface_get_height (surface);
gint stride = cairo_image_surface_get_stride (surface);
guchar *buf = cairo_image_surface_get_data (surface);
cairo_format_t fmt = cairo_image_surface_get_format (surface);
guchar *rowbuf;
gint x, y;
guchar r, g, b, a;
if (fmt != CAIRO_FORMAT_ARGB32)
return;
if (! lcms->transform)
return;
rowbuf = g_malloc (stride);
for (y = 0; y < height; y++, buf += stride)
{
/* Switch buf from ARGB premul to ARGB non-premul, since lcms ignores the
* alpha channel. The macro takes care of byte order.
*/
for (x = 0; x < width; x++)
{
GIMP_CAIRO_ARGB32_GET_PIXEL (buf + 4*x, r, g, b, a);
rowbuf[4*x+0] = a;
rowbuf[4*x+1] = r;
rowbuf[4*x+2] = g;
rowbuf[4*x+3] = b;
}
cmsDoTransform (lcms->transform, rowbuf, rowbuf, width);
/* And back to ARGB premul */
for (x = 0; x < width; x++)
{
a = rowbuf[4*x+0];
r = rowbuf[4*x+1];
g = rowbuf[4*x+2];
b = rowbuf[4*x+3];
GIMP_CAIRO_ARGB32_SET_PIXEL (buf + 4*x, r, g, b, a);
}
}
g_free (rowbuf);
}
static void
cdisplay_gamma_convert_surface (GimpColorDisplay *display,
cairo_surface_t *surface)
{
CdisplayGamma *gamma = CDISPLAY_GAMMA (display);
gint width = cairo_image_surface_get_width (surface);
gint height = cairo_image_surface_get_height (surface);
gint stride = cairo_image_surface_get_stride (surface);
guchar *buf = cairo_image_surface_get_data (surface);
cairo_format_t fmt = cairo_image_surface_get_format (surface);
gint i, j, skip;
gint r, g, b, a;
if (fmt != CAIRO_FORMAT_ARGB32)
return;
/* You will not be using the entire buffer most of the time.
* Hence, the simplistic code for this is as follows:
*
* for (j = 0; j < height; j++)
* {
* for (i = 0; i < width * bpp; i++)
* buf[i] = lookup[buf[i]];
* buf += bpl;
* }
*/
j = height;
skip = stride - 4 * width;
while (j--)
{
i = width;
while (i--)
{
GIMP_CAIRO_ARGB32_GET_PIXEL (buf, r, g, b, a);
r = gamma->lookup[r];
g = gamma->lookup[g];
b = gamma->lookup[b];
GIMP_CAIRO_ARGB32_SET_PIXEL (buf, r, g, b, a);
buf += 4;
}
buf += skip;
}
}
static void
gimp_text_layer_render_layout (GimpTextLayer *layer,
GimpTextLayout *layout)
{
GimpDrawable *drawable = GIMP_DRAWABLE (layer);
GimpItem *item = GIMP_ITEM (layer);
GimpImage *image = gimp_item_get_image (item);
cairo_t *cr;
cairo_surface_t *surface;
PixelRegion layerPR;
const guchar *data;
GimpImageType layer_type;
gint layer_alpha_byte;
gint rowstride;
gint width;
gint height;
gpointer pr;
g_return_if_fail (gimp_drawable_has_alpha (drawable));
width = gimp_item_get_width (item);
height = gimp_item_get_height (item);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
cr = cairo_create (surface);
gimp_text_layout_render (layout, cr, layer->text->base_dir, FALSE);
cairo_destroy (cr);
pixel_region_init (&layerPR, gimp_drawable_get_tiles (drawable),
0, 0, width, height, TRUE);
layer_type = gimp_drawable_type (drawable);
layer_alpha_byte = layerPR.bytes - 1;
cairo_surface_flush (surface);
data = cairo_image_surface_get_data (surface);
rowstride = cairo_image_surface_get_stride (surface);
for (pr = pixel_regions_register (1, &layerPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
const guchar *src = data + layerPR.y * rowstride + layerPR.x * 4;
guchar *dest = layerPR.data;
gint rows = layerPR.h;
while (rows--)
{
const guchar *s = src;
guchar *d = dest;
gint w = layerPR.w;
while (w--)
{
guchar color[4];
GIMP_CAIRO_ARGB32_GET_PIXEL (s,
color[0],
color[1],
color[2],
color[3]);
gimp_image_transform_color (image,
layer_type, d, GIMP_RGB, color);
d[layer_alpha_byte] = color[3];
s += 4;
d += layerPR.bytes;
}
src += rowstride;
dest += layerPR.rowstride;
}
}
cairo_surface_destroy (surface);
gimp_drawable_update (drawable, 0, 0, width, height);
}