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gimp/app/display/gimpdisplayshell-render.c

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/* The GIMP -- an 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "display-types.h"
#include "base/tile-manager.h"
#include "base/tile.h"
#include "core/gimp.h"
#include "core/gimpimage.h"
#include "core/gimpimage-colormap.h"
#include "core/gimpprojection.h"
#include "gimpcanvas.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-filter.h"
#include "gimpdisplayshell-render.h"
typedef struct _RenderInfo RenderInfo;
typedef void (* RenderFunc) (RenderInfo *info);
struct _RenderInfo
{
GimpDisplayShell *shell;
TileManager *src_tiles;
guint *alpha;
guchar *scale;
guchar *src;
guchar *dest;
gint x, y;
gint w, h;
gdouble scalex;
gdouble scaley;
gint src_x, src_y;
gint src_bpp;
gint dest_bpp;
gint dest_bpl;
gint dest_width;
};
static void render_setup_notify (gpointer config,
GParamSpec *param_spec,
Gimp *gimp);
/* accelerate transparency of image scaling */
guchar *render_check_buf = NULL;
guchar *render_empty_buf = NULL;
guchar *render_white_buf = NULL;
guchar *render_temp_buf = NULL;
guchar *render_blend_dark_check = NULL;
guchar *render_blend_light_check = NULL;
guchar *render_blend_white = NULL;
static guchar *tile_buf = NULL;
static guint tile_shift = 0;
static guint check_mod = 0;
static guint check_shift = 0;
void
render_init (Gimp *gimp)
{
g_return_if_fail (GIMP_IS_GIMP (gimp));
g_signal_connect (gimp->config, "notify::transparency-size",
G_CALLBACK (render_setup_notify),
gimp);
g_signal_connect (gimp->config, "notify::transparency-type",
G_CALLBACK (render_setup_notify),
gimp);
render_setup_notify (gimp->config, NULL, gimp);
}
void
render_exit (Gimp *gimp)
{
g_return_if_fail (GIMP_IS_GIMP (gimp));
g_signal_handlers_disconnect_by_func (gimp->config,
render_setup_notify,
gimp);
if (tile_buf)
{
g_free (tile_buf);
tile_buf = NULL;
}
if (render_blend_dark_check)
{
g_free (render_blend_dark_check);
render_blend_dark_check = NULL;
}
if (render_blend_light_check)
{
g_free (render_blend_light_check);
render_blend_light_check = NULL;
}
if (render_blend_white)
{
g_free (render_blend_white);
render_blend_white = NULL;
}
if (render_check_buf)
{
g_free (render_check_buf);
render_check_buf = NULL;
}
if (render_empty_buf)
{
g_free (render_empty_buf);
render_empty_buf = NULL;
}
if (render_white_buf)
{
g_free (render_white_buf);
render_white_buf = NULL;
}
if (render_temp_buf)
{
g_free (render_temp_buf);
render_temp_buf = NULL;
}
}
static void
render_setup_notify (gpointer config,
GParamSpec *param_spec,
Gimp *gimp)
{
GimpCheckType check_type;
GimpCheckSize check_size;
guchar light, dark;
gint i, j;
g_object_get (config,
"transparency-type", &check_type,
"transparency-size", &check_size,
NULL);
/* based on the tile size, determine the tile shift amount
* (assume here that tile_height and tile_width are equal)
*/
tile_shift = 0;
while ((1 << tile_shift) < TILE_WIDTH)
tile_shift++;
/* allocate a buffer for arranging information from a row of tiles */
if (! tile_buf)
tile_buf = g_new (guchar,
GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH * MAX_CHANNELS);
if (! render_blend_dark_check)
render_blend_dark_check = g_new (guchar, 65536);
if (! render_blend_light_check)
render_blend_light_check = g_new (guchar, 65536);
if (! render_blend_white)
render_blend_white = g_new (guchar, 65536);
gimp_checks_get_shades (check_type, &light, &dark);
for (i = 0; i < 256; i++)
for (j = 0; j < 256; j++)
{
render_blend_dark_check [(i << 8) + j] =
(guchar) ((j * i + dark * (255 - i)) / 255);
render_blend_light_check [(i << 8) + j] =
(guchar) ((j * i + light * (255 - i)) / 255);
render_blend_white [(i << 8) + j] =
(guchar) ((j * i + 255 * (255 - i)) / 255);
}
switch (check_size)
{
case GIMP_CHECK_SIZE_SMALL_CHECKS:
check_mod = 0x3;
check_shift = 2;
break;
case GIMP_CHECK_SIZE_MEDIUM_CHECKS:
check_mod = 0x7;
check_shift = 3;
break;
case GIMP_CHECK_SIZE_LARGE_CHECKS:
check_mod = 0xf;
check_shift = 4;
break;
}
g_free (render_check_buf);
g_free (render_empty_buf);
g_free (render_white_buf);
g_free (render_temp_buf);
#define BUF_SIZE (MAX (GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH, \
GIMP_VIEWABLE_MAX_PREVIEW_SIZE) + 4)
render_check_buf = g_new (guchar, BUF_SIZE * 3);
render_empty_buf = g_new0 (guchar, BUF_SIZE * 3);
render_white_buf = g_new (guchar, BUF_SIZE * 3);
render_temp_buf = g_new (guchar, BUF_SIZE * 3);
/* calculate check buffer for previews */
memset (render_white_buf, 255, BUF_SIZE * 3);
for (i = 0; i < BUF_SIZE; i++)
{
if (i & 0x4)
{
render_check_buf[i * 3 + 0] = render_blend_dark_check[0];
render_check_buf[i * 3 + 1] = render_blend_dark_check[0];
render_check_buf[i * 3 + 2] = render_blend_dark_check[0];
}
else
{
render_check_buf[i * 3 + 0] = render_blend_light_check[0];
render_check_buf[i * 3 + 1] = render_blend_light_check[0];
render_check_buf[i * 3 + 2] = render_blend_light_check[0];
}
}
#undef BUF_SIZE
}
/* Render Image functions */
static void render_image_rgb (RenderInfo *info);
static void render_image_rgb_a (RenderInfo *info);
static void render_image_gray (RenderInfo *info);
static void render_image_gray_a (RenderInfo *info);
static void render_image_indexed (RenderInfo *info);
static void render_image_indexed_a (RenderInfo *info);
static void render_image_init_info (RenderInfo *info,
GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h);
static guint * render_image_init_alpha (gint mult);
static guchar * render_image_accelerate_scaling (gint width,
gint start,
gdouble scalex);
static guchar * render_image_tile_fault (RenderInfo *info);
static RenderFunc render_funcs[6] =
{
render_image_rgb,
render_image_rgb_a,
render_image_gray,
render_image_gray_a,
render_image_indexed,
render_image_indexed_a,
};
static void gimp_display_shell_render_highlight (GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h,
GdkRectangle *highlight);
/*****************************************************************/
/* This function is the core of the display--it offsets and */
/* scales the image according to the current parameters in the */
/* gdisp object. It handles color, grayscale, 8, 15, 16, 24, */
/* & 32 bit output depths. */
/*****************************************************************/
void
gimp_display_shell_render (GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h,
GdkRectangle *highlight)
{
RenderInfo info;
GimpImageType type;
g_return_if_fail (w > 0 && h > 0);
render_image_init_info (&info, shell, x, y, w, h);
type = gimp_projection_get_image_type (shell->gdisp->gimage->projection);
g_return_if_fail ((info.dest_bpp >= 1) && (info.dest_bpp <= 4));
/* Currently, only RGBA and GRAYA projection types are used - the rest
* are in case of future need. -- austin, 28th Nov 1998.
*/
if (G_UNLIKELY (type != GIMP_RGBA_IMAGE && type != GIMP_GRAYA_IMAGE))
g_warning ("using untested projection type %d", type);
(* render_funcs[type]) (&info);
/* apply filters to the rendered projection */
if (shell->filter_stack)
gimp_color_display_stack_convert (shell->filter_stack,
shell->render_buf,
w, h,
3,
3 * GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH);
/* dim pixels outside the highlighted rectangle */
if (highlight)
gimp_display_shell_render_highlight (shell, x, y, w, h, highlight);
/* put it to the screen */
gimp_canvas_draw_rgb (GIMP_CANVAS (shell->canvas), GIMP_CANVAS_STYLE_RENDER,
x + shell->disp_xoffset, y + shell->disp_yoffset,
w, h,
shell->render_buf,
3 * GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH,
shell->offset_x, shell->offset_y);
}
#define GIMP_DISPLAY_SHELL_DIM_PIXEL(buf,x) \
{ \
buf[3 * (x) + 0] >>= 1; \
buf[3 * (x) + 1] >>= 1; \
buf[3 * (x) + 2] >>= 1; \
}
/* This function highlights the given area by dimming all pixels outside. */
static void
gimp_display_shell_render_highlight (GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h,
GdkRectangle *highlight)
{
guchar *buf = shell->render_buf;
GdkRectangle rect;
rect.x = shell->offset_x + x;
rect.y = shell->offset_y + y;
rect.width = w;
rect.height = h;
if (gdk_rectangle_intersect (highlight, &rect, &rect))
{
rect.x -= shell->offset_x + x;
rect.y -= shell->offset_y + y;
for (y = 0; y < rect.y; y++)
{
for (x = 0; x < w; x++)
GIMP_DISPLAY_SHELL_DIM_PIXEL (buf, x)
buf += 3 * GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH;
}
for ( ; y < rect.y + rect.height; y++)
{
for (x = 0; x < rect.x; x++)
GIMP_DISPLAY_SHELL_DIM_PIXEL (buf, x)
for (x += rect.width; x < w; x++)
GIMP_DISPLAY_SHELL_DIM_PIXEL (buf, x)
buf += 3 * GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH;
}
for ( ; y < h; y++)
{
for (x = 0; x < w; x++)
GIMP_DISPLAY_SHELL_DIM_PIXEL (buf, x)
buf += 3 * GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH;
}
}
else
{
for (y = 0; y < h; y++)
{
for (x = 0; x < w; x++)
GIMP_DISPLAY_SHELL_DIM_PIXEL (buf, x)
buf += 3 * GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH;
}
}
}
/*************************/
/* 8 Bit functions */
/*************************/
static void
render_image_indexed (RenderInfo *info)
{
const guchar *cmap;
gint y, ye;
gint x, xe;
gboolean initial = TRUE;
cmap = gimp_image_get_colormap (info->shell->gdisp->gimage);
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->src = render_image_tile_fault (info);
while (TRUE)
{
gint error =
RINT (floor ((y + 1) / info->scaley) - floor (y / info->scaley));
if (!initial && (error == 0))
{
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
}
else
{
const guchar *src = info->src;
guchar *dest = info->dest;
for (x = info->x; x < xe; x++)
{
guint val = src[INDEXED_PIX] * 3;
src += 1;
dest[0] = cmap[val + 0];
dest[1] = cmap[val + 1];
dest[2] = cmap[val + 2];
dest += 3;
}
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
if (error)
{
info->src_y += error;
info->src = render_image_tile_fault (info);
initial = TRUE;
}
else
{
initial = FALSE;
}
}
}
static void
render_image_indexed_a (RenderInfo *info)
{
const guint *alpha = info->alpha;
const guchar *cmap;
gint y, ye;
gint x, xe;
gboolean initial = TRUE;
cmap = gimp_image_get_colormap (info->shell->gdisp->gimage);
alpha = info->alpha;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->src = render_image_tile_fault (info);
while (TRUE)
{
gint error =
RINT (floor ((y + 1) / info->scaley) - floor (y / info->scaley));
if (!initial && (error == 0) && (y & check_mod))
{
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
}
else
{
const guchar *src = info->src;
guchar *dest = info->dest;
guint dark_light;
dark_light = (y >> check_shift) + (info->x >> check_shift);
for (x = info->x; x < xe; x++)
{
guint r, g, b, a = alpha[src[ALPHA_I_PIX]];
guint val = src[INDEXED_PIX] * 3;
src += 2;
if (dark_light & 0x1)
{
r = render_blend_dark_check[(a | cmap[val + 0])];
g = render_blend_dark_check[(a | cmap[val + 1])];
b = render_blend_dark_check[(a | cmap[val + 2])];
}
else
{
r = render_blend_light_check[(a | cmap[val + 0])];
g = render_blend_light_check[(a | cmap[val + 1])];
b = render_blend_light_check[(a | cmap[val + 2])];
}
dest[0] = r;
dest[1] = g;
dest[2] = b;
dest += 3;
if (((x + 1) & check_mod) == 0)
dark_light += 1;
}
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
if (error)
{
info->src_y += error;
info->src = render_image_tile_fault (info);
initial = TRUE;
}
else
{
initial = FALSE;
}
}
}
static void
render_image_gray (RenderInfo *info)
{
gint y, ye;
gint x, xe;
gboolean initial = TRUE;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->src = render_image_tile_fault (info);
while (TRUE)
{
gint error =
RINT (floor ((y + 1) / info->scaley) - floor (y / info->scaley));
if (!initial && (error == 0))
{
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
}
else
{
const guchar *src = info->src;
guchar *dest = info->dest;
for (x = info->x; x < xe; x++)
{
guint val = src[GRAY_PIX];
src += 1;
dest[0] = val;
dest[1] = val;
dest[2] = val;
dest += 3;
}
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
if (error)
{
info->src_y += error;
info->src = render_image_tile_fault (info);
initial = TRUE;
}
else
{
initial = FALSE;
}
}
}
static void
render_image_gray_a (RenderInfo *info)
{
const guint *alpha = info->alpha;
gint y, ye;
gint x, xe;
gboolean initial = TRUE;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->src = render_image_tile_fault (info);
while (TRUE)
{
gint error =
RINT (floor ((y + 1) / info->scaley) - floor (y / info->scaley));
if (!initial && (error == 0) && (y & check_mod))
{
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
}
else
{
const guchar *src = info->src;
guchar *dest = info->dest;
guint dark_light;
dark_light = (y >> check_shift) + (info->x >> check_shift);
for (x = info->x; x < xe; x++)
{
guint a = alpha[src[ALPHA_G_PIX]];
guint val;
if (dark_light & 0x1)
val = render_blend_dark_check[(a | src[GRAY_PIX])];
else
val = render_blend_light_check[(a | src[GRAY_PIX])];
src += 2;
dest[0] = val;
dest[1] = val;
dest[2] = val;
dest += 3;
if (((x + 1) & check_mod) == 0)
dark_light += 1;
}
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
if (error)
{
info->src_y += error;
info->src = render_image_tile_fault (info);
initial = TRUE;
}
else
{
initial = FALSE;
}
}
}
static void
render_image_rgb (RenderInfo *info)
{
gint y, ye;
gint xe;
gboolean initial = TRUE;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->src = render_image_tile_fault (info);
while (TRUE)
{
gint error =
RINT (floor ((y + 1) / info->scaley) - floor (y / info->scaley));
if (!initial && (error == 0))
{
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
}
else
{
memcpy (info->dest, info->src, 3 * info->w);
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
if (error)
{
info->src_y += error;
info->src = render_image_tile_fault (info);
initial = TRUE;
}
else
{
initial = FALSE;
}
}
}
static void
render_image_rgb_a (RenderInfo *info)
{
const guint *alpha = info->alpha;
gint y, ye;
gint x, xe;
gint initial = TRUE;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->src = render_image_tile_fault (info);
while (TRUE)
{
gint error =
RINT (floor ((y + 1) / info->scaley) - floor (y / info->scaley));
if (!initial && (error == 0) && (y & check_mod))
{
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
}
else
{
const guchar *src = info->src;
guchar *dest = info->dest;
guint dark_light;
dark_light = (y >> check_shift) + (info->x >> check_shift);
for (x = info->x; x < xe; x++)
{
guint r, g, b, a = alpha[src[ALPHA_PIX]];
if (dark_light & 0x1)
{
r = render_blend_dark_check[(a | src[RED_PIX])];
g = render_blend_dark_check[(a | src[GREEN_PIX])];
b = render_blend_dark_check[(a | src[BLUE_PIX])];
}
else
{
r = render_blend_light_check[(a | src[RED_PIX])];
g = render_blend_light_check[(a | src[GREEN_PIX])];
b = render_blend_light_check[(a | src[BLUE_PIX])];
}
src += 4;
dest[0] = r;
dest[1] = g;
dest[2] = b;
dest += 3;
if (((x + 1) & check_mod) == 0)
dark_light += 1;
}
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
if (error)
{
info->src_y += error;
info->src = render_image_tile_fault (info);
initial = TRUE;
}
else
{
initial = FALSE;
}
}
}
static void
render_image_init_info (RenderInfo *info,
GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h)
{
GimpImage *gimage = shell->gdisp->gimage;
info->shell = shell;
info->src_tiles = gimp_projection_get_tiles (gimage->projection);
info->x = x + shell->offset_x;
info->y = y + shell->offset_y;
info->w = w;
info->h = h;
info->scalex = SCALEFACTOR_X (shell);
info->scaley = SCALEFACTOR_Y (shell);
info->src_x = (gdouble) info->x / info->scalex;
info->src_y = (gdouble) info->y / info->scaley;
info->src_bpp = gimp_projection_get_bytes (gimage->projection);
info->dest = shell->render_buf;
info->dest_bpp = 3;
info->dest_bpl = info->dest_bpp * GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH;
info->dest_width = info->w * info->dest_bpp;
info->scale = render_image_accelerate_scaling (w,
info->x, info->scalex);
info->alpha = NULL;
if (GIMP_IMAGE_TYPE_HAS_ALPHA (gimp_projection_get_image_type (gimage->projection)))
{
info->alpha =
render_image_init_alpha (gimp_projection_get_opacity (gimage->projection) * 255.999);
}
}
static guint *
render_image_init_alpha (gint mult)
{
static guint *alpha_mult = NULL;
static gint alpha_val = -1;
gint i;
if (alpha_val != mult)
{
if (!alpha_mult)
alpha_mult = g_new (guint, 256);
alpha_val = mult;
for (i = 0; i < 256; i++)
alpha_mult[i] = ((mult * i) / 255) << 8;
}
return alpha_mult;
}
static guchar *
render_image_accelerate_scaling (gint width,
gint start,
gdouble scalex)
{
static guchar *scale = NULL;
gint i;
if (! scale)
scale = g_new (guchar, GIMP_DISPLAY_SHELL_RENDER_BUF_WIDTH + 1);
for (i = 0; i <= width; i++)
{
scale[i] = RINT (floor ((start + 1) / scalex) - floor (start / scalex));
start++;
}
return scale;
}
static guchar *
render_image_tile_fault (RenderInfo *info)
{
Tile *tile;
const guchar *src;
const guchar *scale;
guchar *dest;
gint width;
gint tilex;
gint step;
gint bpp = info->src_bpp;
gint x;
tile = tile_manager_get_tile (info->src_tiles,
info->src_x, info->src_y, TRUE, FALSE);
g_return_val_if_fail (tile != NULL, tile_buf);
src = tile_data_pointer (tile,
info->src_x % TILE_WIDTH,
info->src_y % TILE_HEIGHT);
scale = info->scale;
dest = tile_buf;
x = info->src_x;
width = info->w;
tilex = info->src_x / TILE_WIDTH;
do
{
const guchar *s = src;
switch (bpp)
{
case 4:
*dest++ = *s++;
case 3:
*dest++ = *s++;
case 2:
*dest++ = *s++;
case 1:
*dest++ = *s++;
}
step = *scale++;
if (step)
{
x += step;
src += step * bpp;
if ((x >> tile_shift) != tilex)
{
tile_release (tile, FALSE);
tilex += 1;
tile = tile_manager_get_tile (info->src_tiles,
x, info->src_y, TRUE, FALSE);
if (!tile)
return tile_buf;
src = tile_data_pointer (tile,
x % TILE_WIDTH,
info->src_y % TILE_HEIGHT);
}
}
}
while (--width);
tile_release (tile, FALSE);
return tile_buf;
}
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