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gimp/app/display/gimpdisplayshell-render.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "display-types.h"
#include "config/gimpdisplayconfig.h"
#include "gegl/gimp-gegl-utils.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimppickable.h"
#ifdef USE_NODE_BLIT
#include "core/gimpprojectable.h"
#endif
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-transform.h"
#include "gimpdisplayshell-filter.h"
#include "gimpdisplayshell-render.h"
#include "gimpdisplayshell-scroll.h"
#include "gimpdisplayxfer.h"
/* #define GIMP_DISPLAY_RENDER_ENABLE_SCALING 1 */
void
gimp_display_shell_render (GimpDisplayShell *shell,
cairo_t *cr,
gint x,
gint y,
gint w,
gint h)
{
GimpImage *image;
GeglBuffer *buffer;
#ifdef USE_NODE_BLIT
GeglNode *node;
#endif
gdouble scale_x = 1.0;
gdouble scale_y = 1.0;
gdouble buffer_scale = 1.0;
gint viewport_offset_x;
gint viewport_offset_y;
gint viewport_width;
gint viewport_height;
gint scaled_x;
gint scaled_y;
gint scaled_width;
gint scaled_height;
cairo_surface_t *xfer;
gint xfer_src_x;
gint xfer_src_y;
gint mask_src_x = 0;
gint mask_src_y = 0;
gint stride;
guchar *data;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (cr != NULL);
g_return_if_fail (w > 0 && h > 0);
image = gimp_display_get_image (shell->display);
buffer = gimp_pickable_get_buffer (GIMP_PICKABLE (image));
#ifdef USE_NODE_BLIT
node = gimp_projectable_get_graph (GIMP_PROJECTABLE (image));
#endif
#ifdef GIMP_DISPLAY_RENDER_ENABLE_SCALING
/* if we had this future API, things would look pretty on hires (retina) */
scale_x = gdk_window_get_scale_factor (gtk_widget_get_window (gtk_widget_get_toplevel (GTK_WIDGET (shell))));
#endif
scale_x = MIN (scale_x, GIMP_DISPLAY_RENDER_MAX_SCALE);
scale_y = scale_x;
if (shell->scale_x > shell->scale_y)
{
scale_y *= (shell->scale_x / shell->scale_y);
buffer_scale = shell->scale_y * scale_y;
}
else if (shell->scale_y > shell->scale_x)
{
scale_x *= (shell->scale_y / shell->scale_x);
buffer_scale = shell->scale_x * scale_x;
}
else
{
buffer_scale = shell->scale_x * scale_x;
}
gimp_display_shell_scroll_get_scaled_viewport (shell,
&viewport_offset_x,
&viewport_offset_y,
&viewport_width,
&viewport_height);
scaled_x = floor ((x + viewport_offset_x) * scale_x);
scaled_y = floor ((y + viewport_offset_y) * scale_y);
scaled_width = ceil (w * scale_x);
scaled_height = ceil (h * scale_y);
if (shell->rotate_transform)
{
xfer = cairo_surface_create_similar_image (cairo_get_target (cr),
CAIRO_FORMAT_ARGB32,
scaled_width,
scaled_height);
cairo_surface_mark_dirty (xfer);
xfer_src_x = 0;
xfer_src_y = 0;
}
else
{
xfer = gimp_display_xfer_get_surface (shell->xfer,
scaled_width,
scaled_height,
&xfer_src_x,
&xfer_src_y);
}
stride = cairo_image_surface_get_stride (xfer);
data = cairo_image_surface_get_data (xfer);
data += xfer_src_y * stride + xfer_src_x * 4;
/* apply filters to the rendered projection */
if (shell->filter_stack)
{
const Babl *filter_format = babl_format ("R'G'B'A float");
if (! shell->filter_buffer)
{
gint w = GIMP_DISPLAY_RENDER_BUF_WIDTH * GIMP_DISPLAY_RENDER_MAX_SCALE;
gint h = GIMP_DISPLAY_RENDER_BUF_HEIGHT * GIMP_DISPLAY_RENDER_MAX_SCALE;
shell->filter_data =
gegl_malloc (w * h * babl_format_get_bytes_per_pixel (filter_format));
shell->filter_stride = w * babl_format_get_bytes_per_pixel (filter_format);
shell->filter_buffer =
gegl_buffer_linear_new_from_data (shell->filter_data,
filter_format,
GEGL_RECTANGLE (0, 0, w, h),
GEGL_AUTO_ROWSTRIDE,
(GDestroyNotify) gegl_free,
shell->filter_data);
}
#ifndef USE_NODE_BLIT
gegl_buffer_get (buffer,
GEGL_RECTANGLE (scaled_x, scaled_y,
scaled_width, scaled_height),
buffer_scale,
filter_format,
shell->filter_data, shell->filter_stride,
GEGL_ABYSS_CLAMP);
#else
gegl_node_blit (node,
buffer_scale,
GEGL_RECTANGLE (scaled_x, scaled_y,
scaled_width, scaled_height),
filter_format,
shell->filter_data, shell->filter_stride,
GEGL_BLIT_CACHE);
#endif
gimp_color_display_stack_convert_buffer (shell->filter_stack,
shell->filter_buffer,
GEGL_RECTANGLE (0, 0,
scaled_width,
scaled_height));
gegl_buffer_get (shell->filter_buffer,
GEGL_RECTANGLE (0, 0,
scaled_width,
scaled_height),
1.0,
babl_format ("cairo-ARGB32"),
data, stride,
GEGL_ABYSS_CLAMP);
}
else
{
#ifndef USE_NODE_BLIT
gegl_buffer_get (buffer,
GEGL_RECTANGLE (scaled_x, scaled_y,
scaled_width, scaled_height),
buffer_scale,
babl_format ("cairo-ARGB32"),
data, stride,
GEGL_ABYSS_CLAMP);
#else
gegl_node_blit (node,
buffer_scale,
GEGL_RECTANGLE (scaled_x, scaled_y,
scaled_width, scaled_height),
babl_format ("cairo-ARGB32"),
data, stride,
GEGL_BLIT_CACHE);
#endif
}
if (shell->mask)
{
if (! shell->mask_surface)
{
shell->mask_surface =
cairo_image_surface_create (CAIRO_FORMAT_A8,
GIMP_DISPLAY_RENDER_BUF_WIDTH *
GIMP_DISPLAY_RENDER_MAX_SCALE,
GIMP_DISPLAY_RENDER_BUF_HEIGHT *
GIMP_DISPLAY_RENDER_MAX_SCALE);
}
cairo_surface_mark_dirty (shell->mask_surface);
stride = cairo_image_surface_get_stride (shell->mask_surface);
data = cairo_image_surface_get_data (shell->mask_surface);
data += mask_src_y * stride + mask_src_x * 4;
gegl_buffer_get (shell->mask,
GEGL_RECTANGLE (scaled_x, scaled_y,
scaled_width, scaled_height),
buffer_scale,
babl_format ("Y u8"),
data, stride,
GEGL_ABYSS_CLAMP);
if (shell->mask_inverted)
{
gint mask_height = scaled_height;
while (mask_height--)
{
gint mask_width = scaled_width;
guchar *d = data;
while (mask_width--)
{
guchar inv = 255 - *d;
*d++ = inv;
}
data += stride;
}
}
}
/* put it to the screen */
cairo_save (cr);
cairo_rectangle (cr, x, y, w, h);
cairo_scale (cr, 1.0 / scale_x, 1.0 / scale_y);
cairo_set_source_surface (cr, xfer,
x * scale_x - xfer_src_x,
y * scale_y - xfer_src_y);
if (shell->rotate_transform)
{
cairo_pattern_t *pattern;
pattern = cairo_get_source (cr);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
cairo_set_line_width (cr, 1.0);
cairo_stroke_preserve (cr);
cairo_surface_destroy (xfer);
}
cairo_clip (cr);
cairo_paint (cr);
if (shell->mask)
{
gimp_cairo_set_source_rgba (cr, &shell->mask_color);
cairo_mask_surface (cr, shell->mask_surface,
(x - mask_src_x) * scale_x,
(y - mask_src_y) * scale_y);
}
cairo_restore (cr);
}
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