355 lines
8.1 KiB
C
355 lines
8.1 KiB
C
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/*********************************************************/
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/* Image manipulation routines. Calls mapobject_shade.c */
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/* functions to compute the shading of the image at each */
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/* pixel. These routines are used by the functions in */
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/* mapobject_preview.c and mapobject_apply.c */
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/*********************************************************/
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#include "config.h"
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#include <string.h>
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#include <sys/types.h>
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#include <gtk/gtk.h>
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#include <libpika/pika.h>
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#include <libpika/pikaui.h>
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#include "map-object-main.h"
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#include "map-object-preview.h"
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#include "map-object-shade.h"
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#include "map-object-ui.h"
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#include "map-object-image.h"
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PikaImage *image;
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PikaDrawable *input_drawable;
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PikaDrawable *output_drawable;
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GeglBuffer *source_buffer;
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GeglBuffer *dest_buffer;
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PikaDrawable *box_drawables[6];
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GeglBuffer *box_buffers[6];
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PikaDrawable *cylinder_drawables[2];
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GeglBuffer *cylinder_buffers[2];
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guchar *preview_rgb_data = NULL;
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gint preview_rgb_stride;
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cairo_surface_t *preview_surface = NULL;
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glong maxcounter, old_depth, max_depth;
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gint width, height;
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PikaRGB background;
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gint border_x, border_y, border_w, border_h;
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/******************/
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/* Implementation */
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/******************/
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PikaRGB
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peek (gint x,
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gint y)
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{
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PikaRGB color;
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gegl_buffer_sample (source_buffer, x, y, NULL,
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&color, babl_format ("R'G'B'A double"),
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GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
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if (! babl_format_has_alpha (gegl_buffer_get_format (source_buffer)))
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color.a = 1.0;
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return color;
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}
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static PikaRGB
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peek_box_image (gint image,
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gint x,
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gint y)
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{
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PikaRGB color;
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gegl_buffer_sample (box_buffers[image], x, y, NULL,
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&color, babl_format ("R'G'B'A double"),
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GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
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if (! babl_format_has_alpha (gegl_buffer_get_format (box_buffers[image])))
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color.a = 1.0;
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return color;
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}
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static PikaRGB
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peek_cylinder_image (gint image,
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gint x,
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gint y)
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{
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PikaRGB color;
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gegl_buffer_sample (cylinder_buffers[image], x, y, NULL,
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&color, babl_format ("R'G'B'A double"),
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GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
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if (! babl_format_has_alpha (gegl_buffer_get_format (cylinder_buffers[image])))
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color.a = 1.0;
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return color;
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}
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void
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poke (gint x,
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gint y,
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PikaRGB *color,
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gpointer user_data)
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{
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gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x, y, 1, 1), 0,
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babl_format ("R'G'B'A double"), color,
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GEGL_AUTO_ROWSTRIDE);
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}
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gint
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checkbounds (gint x,
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gint y)
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{
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if (x < border_x ||
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y < border_y ||
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x >= border_x + border_w ||
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y >= border_y + border_h)
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return FALSE;
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else
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return TRUE;
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}
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static gint
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checkbounds_box_image (gint image,
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gint x,
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gint y)
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{
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gint w, h;
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w = gegl_buffer_get_width (box_buffers[image]);
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h = gegl_buffer_get_height (box_buffers[image]);
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if (x < 0 || y < 0 || x >= w || y >= h)
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return FALSE ;
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else
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return TRUE ;
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}
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static gint
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checkbounds_cylinder_image (gint image,
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gint x,
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gint y)
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{
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gint w, h;
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w = gegl_buffer_get_width (cylinder_buffers[image]);
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h = gegl_buffer_get_height (cylinder_buffers[image]);
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if (x < 0 || y < 0 || x >= w || y >= h)
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return FALSE;
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else
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return TRUE;
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}
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PikaVector3
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int_to_pos (gint x,
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gint y)
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{
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PikaVector3 pos;
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pos.x = (gdouble) x / (gdouble) width;
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pos.y = (gdouble) y / (gdouble) height;
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pos.z = 0.0;
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return pos;
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}
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void
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pos_to_int (gdouble x,
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gdouble y,
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gint *scr_x,
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gint *scr_y)
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{
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*scr_x = (gint) ((x * (gdouble) width));
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*scr_y = (gint) ((y * (gdouble) height));
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}
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/**********************************************/
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/* Compute the image color at pos (u,v) using */
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/* Quartics bilinear interpolation stuff. */
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/**********************************************/
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PikaRGB
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get_image_color (gdouble u,
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gdouble v,
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gint *inside)
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{
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gint x1, y1, x2, y2;
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PikaRGB p[4];
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pos_to_int (u, v, &x1, &y1);
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if (mapvals.tiled == TRUE)
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{
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*inside = TRUE;
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if (x1 < 0) x1 = (width-1) - (-x1 % width);
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else x1 = x1 % width;
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if (y1 < 0) y1 = (height-1) - (-y1 % height);
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else y1 = y1 % height;
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x2 = (x1 + 1) % width;
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y2 = (y1 + 1) % height;
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p[0] = peek (x1, y1);
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p[1] = peek (x2, y1);
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p[2] = peek (x1, y2);
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p[3] = peek (x2, y2);
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return pika_bilinear_rgba (u * width, v * height, p);
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}
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if (checkbounds (x1, y1) == FALSE)
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{
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*inside =FALSE;
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return background;
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}
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x2 = (x1 + 1);
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y2 = (y1 + 1);
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if (checkbounds (x2, y2) == FALSE)
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{
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*inside = TRUE;
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return peek (x1, y1);
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}
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*inside=TRUE;
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p[0] = peek (x1, y1);
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p[1] = peek (x2, y1);
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p[2] = peek (x1, y2);
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p[3] = peek (x2, y2);
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return pika_bilinear_rgba (u * width, v * height, p);
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}
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PikaRGB
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get_box_image_color (gint image,
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gdouble u,
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gdouble v)
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{
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gint w, h;
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gint x1, y1, x2, y2;
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PikaRGB p[4];
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w = gegl_buffer_get_width (box_buffers[image]);
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h = gegl_buffer_get_height (box_buffers[image]);
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x1 = (gint) ((u * (gdouble) w));
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y1 = (gint) ((v * (gdouble) h));
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if (checkbounds_box_image (image, x1, y1) == FALSE)
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return background;
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x2 = (x1 + 1);
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y2 = (y1 + 1);
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if (checkbounds_box_image (image, x2, y2) == FALSE)
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return peek_box_image (image, x1,y1);
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p[0] = peek_box_image (image, x1, y1);
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p[1] = peek_box_image (image, x2, y1);
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p[2] = peek_box_image (image, x1, y2);
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p[3] = peek_box_image (image, x2, y2);
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return pika_bilinear_rgba (u * w, v * h, p);
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}
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PikaRGB
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get_cylinder_image_color (gint image,
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gdouble u,
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gdouble v)
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{
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gint w, h;
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gint x1, y1, x2, y2;
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PikaRGB p[4];
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w = gegl_buffer_get_width (cylinder_buffers[image]);
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h = gegl_buffer_get_height (cylinder_buffers[image]);
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x1 = (gint) ((u * (gdouble) w));
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y1 = (gint) ((v * (gdouble) h));
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if (checkbounds_cylinder_image (image, x1, y1) == FALSE)
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return background;
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x2 = (x1 + 1);
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y2 = (y1 + 1);
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if (checkbounds_cylinder_image (image, x2, y2) == FALSE)
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return peek_cylinder_image (image, x1,y1);
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p[0] = peek_cylinder_image (image, x1, y1);
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p[1] = peek_cylinder_image (image, x2, y1);
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p[2] = peek_cylinder_image (image, x1, y2);
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p[3] = peek_cylinder_image (image, x2, y2);
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return pika_bilinear_rgba (u * w, v * h, p);
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}
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/****************************************/
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/* Allocate memory for temporary images */
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/****************************************/
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gint
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image_setup (PikaDrawable *drawable,
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gint interactive)
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{
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input_drawable = drawable;
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output_drawable = drawable;
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if (! pika_drawable_mask_intersect (drawable, &border_x, &border_y,
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&border_w, &border_h))
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return FALSE;
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width = pika_drawable_get_width (input_drawable);
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height = pika_drawable_get_height (input_drawable);
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source_buffer = pika_drawable_get_buffer (input_drawable);
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maxcounter = (glong) width * (glong) height;
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if (mapvals.transparent_background == TRUE)
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{
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pika_rgba_set (&background, 0.0, 0.0, 0.0, 0.0);
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}
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else
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{
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pika_context_get_background (&background);
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pika_rgb_set_alpha (&background, 1.0);
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}
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if (interactive == TRUE)
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{
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preview_rgb_stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24,
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PREVIEW_WIDTH);
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preview_rgb_data = g_new0 (guchar, preview_rgb_stride * PREVIEW_HEIGHT);
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preview_surface = cairo_image_surface_create_for_data (preview_rgb_data,
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CAIRO_FORMAT_RGB24,
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PREVIEW_WIDTH,
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PREVIEW_HEIGHT,
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preview_rgb_stride);
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}
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return TRUE;
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}
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