/* 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 .
*/
#include "config.h"
#include
#include
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "display-types.h"
#include "base/tile-manager.h"
#include "base/tile.h"
#include "config/gimpdisplayconfig.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimppickable.h"
#include "core/gimpprojection.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-filter.h"
#include "gimpdisplayshell-render.h"
#include "gimpdisplayshell-scroll.h"
#define GIMP_DISPLAY_ZOOM_FAST (1 << 0) /* use the fastest possible code
path trading quality for speed
*/
#define GIMP_DISPLAY_ZOOM_PIXEL_AA (1 << 1) /* provide AA edges when zooming in
on the actual pixels (in current
code only enables it between
100% and 200% zoom)
*/
typedef struct _RenderInfo RenderInfo;
typedef void (* RenderFunc) (RenderInfo *info);
struct _RenderInfo
{
TileManager *src_tiles;
const guchar *src;
gboolean src_is_premult;
guchar *dest;
gint x, y;
gint w, h;
gdouble scalex; /* scale from (pre-scaled) src to dest */
gdouble scaley;
gdouble full_scalex; /* actual display scale factor */
gdouble full_scaley;
gint src_x;
gint src_y;
gint dest_bpl;
gint zoom_quality;
/* Bresenham helpers */
gint x_dest_inc; /* amount to increment for each dest. pixel */
gint x_src_dec; /* amount to decrement for each source pixel */
gint64 dx_start; /* pixel fraction for first pixel */
gint y_dest_inc;
gint y_src_dec;
gint64 dy_start;
gint footprint_x;
gint footprint_y;
gint footshift_x;
gint footshift_y;
gint64 dy;
};
static guchar tile_buf[GIMP_DISPLAY_RENDER_BUF_WIDTH * MAX_CHANNELS];
static void gimp_display_shell_render_info_init (RenderInfo *info,
GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h,
cairo_surface_t *dest,
TileManager *tiles,
gint level,
gboolean is_premult);
/* Render Image functions */
static void render_image_alpha (RenderInfo *info);
static void render_image_gray_a (RenderInfo *info);
static void render_image_rgb_a (RenderInfo *info);
static const guchar * render_image_tile_fault (RenderInfo *info);
/*****************************************************************/
/* This function is the core of the display -- it offsets and */
/* scales the image according to the current parameters in the */
/* display object. It handles RGBA and GRAYA projection tiles */
/* and renders them to an ARGB32 cairo surface. */
/*****************************************************************/
void
gimp_display_shell_render (GimpDisplayShell *shell,
cairo_t *cr,
gint x,
gint y,
gint w,
gint h)
{
GimpProjection *projection;
GimpImage *image;
TileManager *tiles;
RenderInfo info;
GimpImageType type;
gint level;
gboolean premult;
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);
projection = gimp_image_get_projection (image);
/* setup RenderInfo for rendering a GimpProjection level. */
level = gimp_projection_get_level (projection,
shell->scale_x, shell->scale_y);
tiles = gimp_projection_get_tiles_at_level (projection, level, &premult);
gimp_display_shell_render_info_init (&info,
shell, x, y, w, h,
shell->render_surface,
tiles, level, premult);
/* Currently, only RGBA and GRAYA projection types are used. */
type = gimp_pickable_get_image_type (GIMP_PICKABLE (projection));
switch (type)
{
case GIMP_RGBA_IMAGE:
render_image_rgb_a (&info);
break;
case GIMP_GRAYA_IMAGE:
render_image_gray_a (&info);
break;
default:
g_warning ("%s: unsupported projection type (%d)", G_STRFUNC, type);
g_assert_not_reached ();
}
/* apply filters to the rendered projection */
if (shell->filter_stack)
{
cairo_surface_t *sub = shell->render_surface;
if (w != GIMP_DISPLAY_RENDER_BUF_WIDTH ||
h != GIMP_DISPLAY_RENDER_BUF_HEIGHT)
sub = cairo_image_surface_create_for_data (cairo_image_surface_get_data (sub),
CAIRO_FORMAT_ARGB32, w, h,
GIMP_DISPLAY_RENDER_BUF_WIDTH * 4);
gimp_color_display_stack_convert_surface (shell->filter_stack, sub);
if (sub != shell->render_surface)
cairo_surface_destroy (sub);
}
cairo_surface_mark_dirty_rectangle (shell->render_surface, 0, 0, w, h);
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_BUF_HEIGHT);
}
tiles = gimp_drawable_get_tiles (shell->mask);
/* The mask does not (yet) have an image pyramid, use 0 as level, */
gimp_display_shell_render_info_init (&info,
shell, x, y, w, h,
shell->mask_surface,
tiles, 0, FALSE);
render_image_alpha (&info);
cairo_surface_mark_dirty (shell->mask_surface);
}
/* put it to the screen */
{
gint disp_xoffset, disp_yoffset;
cairo_save (cr);
gimp_display_shell_scroll_get_disp_offset (shell,
&disp_xoffset, &disp_yoffset);
cairo_rectangle (cr, x + disp_xoffset, y + disp_yoffset, w, h);
cairo_clip (cr);
cairo_set_source_surface (cr, shell->render_surface,
x + disp_xoffset, y + disp_yoffset);
cairo_paint (cr);
if (shell->mask)
{
gimp_cairo_set_source_rgba (cr, &shell->mask_color);
cairo_mask_surface (cr, shell->mask_surface,
x + disp_xoffset, y + disp_yoffset);
}
cairo_restore (cr);
}
}
/* render a GRAY tile to an A8 cairo surface */
static void
render_image_alpha (RenderInfo *info)
{
gint y, ye;
gint x, xe;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->dy = info->dy_start;
info->src = render_image_tile_fault (info);
while (TRUE)
{
const guchar *src = info->src;
guchar *dest = info->dest;
for (x = info->x; x < xe; x++, src++, dest++)
{
*dest = *src;
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
info->dy += info->y_dest_inc;
info->src_y += info->dy / info->y_src_dec;
info->dy = info->dy % info->y_src_dec;
info->src = render_image_tile_fault (info);
}
}
/* render a GRAYA tile to an ARGB32 cairo surface */
static void
render_image_gray_a (RenderInfo *info)
{
gint y, ye;
gint x, xe;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->dy = info->dy_start;
info->src = render_image_tile_fault (info);
while (TRUE)
{
const guchar *src = info->src;
guint32 *dest = (guint32 *) info->dest;
for (x = info->x; x < xe; x++, src += 2, dest++)
{
/* data in src is premultiplied already */
*dest = (src[1] << 24) | (src[0] << 16) | (src[0] << 8) | src[0];
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
info->dy += info->y_dest_inc;
info->src_y += info->dy / info->y_src_dec;
info->dy = info->dy % info->y_src_dec;
info->src = render_image_tile_fault (info);
}
}
/* render an RGBA tile to an ARGB32 cairo surface */
static void
render_image_rgb_a (RenderInfo *info)
{
gint y, ye;
gint x, xe;
y = info->y;
ye = info->y + info->h;
xe = info->x + info->w;
info->dy = info->dy_start;
info->src = render_image_tile_fault (info);
while (TRUE)
{
const guchar *src = info->src;
guint32 *dest = (guint32 *) info->dest;
for (x = info->x; x < xe; x++, src += 4, dest++)
{
/* data in src is premultiplied already */
*dest = (src[3] << 24) | (src[0] << 16) | (src[1] << 8) | src[2];
}
if (++y == ye)
break;
info->dest += info->dest_bpl;
info->dy += info->y_dest_inc;
info->src_y += info->dy / info->y_src_dec;
info->dy = info->dy % info->y_src_dec;
if (info->src_y >= 0)
info->src = render_image_tile_fault (info);
}
}
static void
gimp_display_shell_render_info_init (RenderInfo *info,
GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h,
cairo_surface_t *dest,
TileManager *tiles,
gint level,
gboolean is_premult)
{
gint offset_x;
gint offset_y;
gimp_display_shell_scroll_get_render_start_offset (shell,
&offset_x, &offset_y);
info->x = x + offset_x;
info->y = y + offset_y;
info->w = w;
info->h = h;
/* This function must be called before switching from drawing
* on the surface with cairo to drawing on it directly
*/
cairo_surface_flush (dest);
info->dest = cairo_image_surface_get_data (dest);
info->dest_bpl = cairo_image_surface_get_stride (dest);
info->src_tiles = tiles;
info->src_is_premult = is_premult;
info->scalex = shell->scale_x * (1 << level);
info->scaley = shell->scale_y * (1 << level);
info->full_scalex = shell->scale_x;
info->full_scaley = shell->scale_y;
/* use Bresenham like stepping */
info->x_dest_inc = shell->x_dest_inc >> level;
info->x_src_dec = shell->x_src_dec;
info->dx_start = ((gint64) info->x_dest_inc * info->x
+ info->x_dest_inc / 2);
info->src_x = info->dx_start / info->x_src_dec;
info->dx_start = info->dx_start % info->x_src_dec;
/* same for y */
info->y_dest_inc = shell->y_dest_inc >> level;
info->y_src_dec = shell->y_src_dec;
info->dy_start = ((gint64) info->y_dest_inc * info->y
+ info->y_dest_inc / 2);
info->src_y = info->dy_start / info->y_src_dec;
info->dy_start = info->dy_start % info->y_src_dec;
/* make sure that the footprint is in the range 256..512 */
info->footprint_x = info->x_src_dec;
info->footshift_x = 0;
while (info->footprint_x > 512)
{
info->footprint_x >>= 1;
info->footshift_x --;
}
while (info->footprint_x < 256)
{
info->footprint_x <<= 1;
info->footshift_x ++;
}
info->footprint_y = info->y_src_dec;
info->footshift_y = 0;
while (info->footprint_y > 512)
{
info->footprint_y >>= 1;
info->footshift_y --;
}
while (info->footprint_y < 256)
{
info->footprint_y <<= 1;
info->footshift_y ++;
}
switch (shell->display->config->zoom_quality)
{
case GIMP_ZOOM_QUALITY_LOW:
info->zoom_quality = GIMP_DISPLAY_ZOOM_FAST;
break;
case GIMP_ZOOM_QUALITY_HIGH:
info->zoom_quality = GIMP_DISPLAY_ZOOM_PIXEL_AA;
break;
}
}
/* This version assumes that the src data is already pre-multiplied. */
static inline void
box_filter (const guint left_weight,
const guint center_weight,
const guint right_weight,
const guint top_weight,
const guint middle_weight,
const guint bottom_weight,
const guchar **src, /* the 9 surrounding source pixels */
guchar *dest,
const gint bpp)
{
const guint sum = ((left_weight + center_weight + right_weight) *
(top_weight + middle_weight + bottom_weight));
gint i;
for (i = 0; i < bpp; i++)
{
dest[i] = ( left_weight * ((src[0][i] * top_weight) +
(src[3][i] * middle_weight) +
(src[6][i] * bottom_weight))
+ center_weight * ((src[1][i] * top_weight) +
(src[4][i] * middle_weight) +
(src[7][i] * bottom_weight))
+ right_weight * ((src[2][i] * top_weight) +
(src[5][i] * middle_weight) +
(src[8][i] * bottom_weight))) / sum;
}
}
/* This version assumes that the src data is not pre-multipled.
* It creates pre-multiplied output though.
*/
static inline void
box_filter_premult (const guint left_weight,
const guint center_weight,
const guint right_weight,
const guint top_weight,
const guint middle_weight,
const guint bottom_weight,
const guchar **src, /* the 9 surrounding source pixels */
guchar *dest,
const gint bpp)
{
const guint sum = ((left_weight + center_weight + right_weight) *
(top_weight + middle_weight + bottom_weight)) >> 4;
switch (bpp)
{
case 4:
#define ALPHA 3
{
const guint factors[9] =
{
(src[1][ALPHA] * top_weight) >> 4,
(src[4][ALPHA] * middle_weight) >> 4,
(src[7][ALPHA] * bottom_weight) >> 4,
(src[2][ALPHA] * top_weight) >> 4,
(src[5][ALPHA] * middle_weight) >> 4,
(src[8][ALPHA] * bottom_weight) >> 4,
(src[0][ALPHA] * top_weight) >> 4,
(src[3][ALPHA] * middle_weight) >> 4,
(src[6][ALPHA] * bottom_weight) >> 4
};
const guint a =
(center_weight * (factors[0] + factors[1] + factors[2]) +
right_weight * (factors[3] + factors[4] + factors[5]) +
left_weight * (factors[6] + factors[7] + factors[8]));
guint i;
for (i = 0; i < ALPHA; i++)
{
dest[i] = (center_weight * (factors[0] * src[1][i] +
factors[1] * src[4][i] +
factors[2] * src[7][i]) +
right_weight * (factors[3] * src[2][i] +
factors[4] * src[5][i] +
factors[5] * src[8][i]) +
left_weight * (factors[6] * src[0][i] +
factors[7] * src[3][i] +
factors[8] * src[6][i]) + ((255 * sum) >> 1)) / (255 * sum);
}
dest[ALPHA] = (a + (sum >> 1)) / sum;
}
#undef ALPHA
break;
case 2:
#define ALPHA 1
/* NOTE: this is a copy and paste of the code above, ALPHA changes
* the behavior in all needed ways.
*/
{
const guint factors[9] =
{
(src[1][ALPHA] * top_weight) >> 4,
(src[4][ALPHA] * middle_weight) >> 4,
(src[7][ALPHA] * bottom_weight) >> 4,
(src[2][ALPHA] * top_weight) >> 4,
(src[5][ALPHA] * middle_weight) >> 4,
(src[8][ALPHA] * bottom_weight) >> 4,
(src[0][ALPHA] * top_weight) >> 4,
(src[3][ALPHA] * middle_weight) >> 4,
(src[6][ALPHA] * bottom_weight) >> 4
};
const guint a =
(center_weight * (factors[0] + factors[1] + factors[2]) +
right_weight * (factors[3] + factors[4] + factors[5]) +
left_weight * (factors[6] + factors[7] + factors[8]));
guint i;
for (i = 0; i < ALPHA; i++)
{
dest[i] = (center_weight * (factors[0] * src[1][i] +
factors[1] * src[4][i] +
factors[2] * src[7][i]) +
right_weight * (factors[3] * src[2][i] +
factors[4] * src[5][i] +
factors[5] * src[8][i]) +
left_weight * (factors[6] * src[0][i] +
factors[7] * src[3][i] +
factors[8] * src[6][i]) + ((255 * sum) >> 1)) / (sum * 255);
}
dest[ALPHA] = (a + (sum >> 1)) / sum;
}
#undef ALPHA
break;
default:
g_warning ("bpp=%i not implemented as box filter", bpp);
break;
}
}
/* fast paths */
static const guchar * render_image_tile_fault_one_row (RenderInfo *info);
static const guchar * render_image_tile_fault_nearest (RenderInfo *info);
/* 012 <- this is the order of the numbered source tiles / pixels.
* 345 for the 3x3 neighbourhoods.
* 678
*/
/* Function to render a horizontal line of view data. The data
* returned from this function has the alpha channel pre-multiplied.
*/
static const guchar *
render_image_tile_fault (RenderInfo *info)
{
Tile *tile[9];
const guchar *src[9];
guchar *dest;
gint width;
gint tilex0; /* the current x-tile indice used for the middle
sample pair*/
gint tilex1; /* the current x-tile indice used for the right
sample pair */
gint tilexL; /* the current x-tile indice used for the left
sample pair */
gint bpp;
gint dx;
gint src_x;
gint skipped;
guint left_weight;
guint center_weight;
guint right_weight;
guint top_weight;
guint middle_weight;
guint bottom_weight;
guint source_width;
guint source_height;
source_width = tile_manager_width (info->src_tiles);
source_height = tile_manager_height (info->src_tiles);
/* dispatch to fast path functions on special conditions */
if ((info->zoom_quality & GIMP_DISPLAY_ZOOM_FAST)
/* use nearest neighbour for exact levels */
|| (info->scalex == 1.0 &&
info->scaley == 1.0)
/* or when we're larger than 1.0 and not using any AA */
|| (info->full_scalex > 1.0 &&
info->full_scaley > 1.0 &&
(! (info->zoom_quality & GIMP_DISPLAY_ZOOM_PIXEL_AA)))
/* or at any point when both scale factors are greater or equal to 200% */
|| (info->full_scalex >= 2.0 &&
info->full_scaley >= 2.0 )
/* or when we're scaling a 1bpp texture, this code-path seems to be
* invoked when interacting with SIOX which uses a palletized drawable
*/
|| (tile_manager_bpp (info->src_tiles)==1)
)
{
return render_image_tile_fault_nearest (info);
}
else if (((info->src_y) & ~(TILE_WIDTH -1)) ==
((info->src_y + 1) & ~(TILE_WIDTH -1)) &&
((info->src_y) & ~(TILE_WIDTH -1)) ==
((info->src_y - 1) & ~(TILE_WIDTH -1)) &&
(info->src_y + 1 < source_height)
)
{
/* all the tiles needed are in a single row, use a tile iterator
* optimized for this case. */
return render_image_tile_fault_one_row (info);
}
top_weight = MAX (info->footprint_y / 2,
info->footshift_y > 0 ? info->dy << info->footshift_y
: info->dy >> -info->footshift_y)
- (info->footshift_y > 0 ? info->dy << info->footshift_y
: info->dy >> -info->footshift_y);
bottom_weight = MAX (info->footprint_y / 2,
info->footshift_y > 0 ? info->dy << info->footshift_y
: info->dy >> -info->footshift_y)
- info->footprint_y / 2;
middle_weight = info->footprint_y - top_weight - bottom_weight;
tile[4] = tile_manager_get_tile (info->src_tiles,
info->src_x, info->src_y,
TRUE, FALSE);
tile[7] = tile_manager_get_tile (info->src_tiles,
info->src_x, info->src_y + 1,
TRUE, FALSE);
tile[1] = tile_manager_get_tile (info->src_tiles,
info->src_x, info->src_y - 1,
TRUE, FALSE);
tile[5] = tile_manager_get_tile (info->src_tiles,
info->src_x + 1, info->src_y,
TRUE, FALSE);
tile[8] = tile_manager_get_tile (info->src_tiles,
info->src_x + 1, info->src_y + 1,
TRUE, FALSE);
tile[2] = tile_manager_get_tile (info->src_tiles,
info->src_x + 1, info->src_y - 1,
TRUE, FALSE);
tile[3] = tile_manager_get_tile (info->src_tiles,
info->src_x - 1, info->src_y,
TRUE, FALSE);
tile[6] = tile_manager_get_tile (info->src_tiles,
info->src_x - 1, info->src_y + 1,
TRUE, FALSE);
tile[0] = tile_manager_get_tile (info->src_tiles,
info->src_x - 1, info->src_y - 1,
TRUE, FALSE);
g_return_val_if_fail (tile[4] != NULL, tile_buf);
src[4] = tile_data_pointer (tile[4], info->src_x, info->src_y);
if (tile[5])
{
src[5] = tile_data_pointer (tile[5], info->src_x + 1, info->src_y);
}
else
{
src[5] = src[4]; /* reusing existing pixel data */
}
if (tile[7])
{
src[7] = tile_data_pointer (tile[7], info->src_x, info->src_y + 1);
}
else
{
src[7] = src[4]; /* reusing existing pixel data */
}
if (tile[1])
{
src[1] = tile_data_pointer (tile[1], info->src_x, info->src_y - 1);
}
else
{
src[1] = src[4]; /* reusing existing pixel data */
}
if (tile[8])
{
src[8] = tile_data_pointer (tile[8], info->src_x + 1, info->src_y + 1);
}
else
{
src[8] = src[5]; /* reusing existing pixel data */
}
if (tile[0])
{
src[0] = tile_data_pointer (tile[0], info->src_x - 1, info->src_y - 1);
}
else
{
src[0] = src[1]; /* reusing existing pixel data */
}
if (tile[2])
{
src[2] = tile_data_pointer (tile[2], info->src_x + 1, info->src_y - 1);
}
else
{
src[2] = src[4]; /* reusing existing pixel data */
}
if (tile[3])
{
src[3] = tile_data_pointer (tile[3], info->src_x - 1, info->src_y);
}
else
{
src[3] = src[4]; /* reusing existing pixel data */
}
if (tile[6])
{
src[6] = tile_data_pointer (tile[6], info->src_x - 1, info->src_y + 1);
}
else
{
src[6] = src[7]; /* reusing existing pixel data */
}
bpp = tile_manager_bpp (info->src_tiles);
dest = tile_buf;
dx = info->dx_start;
src_x = info->src_x;
width = info->w;
tilex0 = info->src_x / TILE_WIDTH;
tilex1 = (info->src_x + 1) / TILE_WIDTH;
tilexL = (info->src_x - 1) / TILE_WIDTH;
do
{
/* we're dealing with unsigneds here, be extra careful */
left_weight = MAX (info->footprint_x / 2,
info->footshift_x > 0 ? dx << info->footshift_x
: dx >> -info->footshift_x)
- (info->footshift_x > 0 ? dx << info->footshift_x
: dx >> -info->footshift_x);
right_weight = MAX (info->footprint_x / 2,
info->footshift_x > 0 ? dx << info->footshift_x
: dx >> -info->footshift_x)
- info->footprint_x / 2;
center_weight = info->footprint_x - left_weight - right_weight;
if (src_x + 1 >= source_width)
{
src[2] = src[1];
src[5] = src[4];
src[8] = src[7];
}
if (info->src_y + 1 >= source_height)
{
src[6] = src[3];
src[7] = src[4];
src[8] = src[5];
}
if (info->src_is_premult)
box_filter (left_weight, center_weight, right_weight,
top_weight, middle_weight, bottom_weight,
src, dest, bpp);
else
box_filter_premult (left_weight, center_weight, right_weight,
top_weight, middle_weight, bottom_weight,
src, dest, bpp);
dest += bpp;
dx += info->x_dest_inc;
skipped = dx / info->x_src_dec;
if (skipped)
{
dx -= skipped * info->x_src_dec;
/* if we changed integer source pixel coordinates in the source
* buffer, make sure the src pointers (and their backing tiles) are
* correct
*/
if (src[0] != src[1])
{
src[0] += skipped * bpp;
}
else
{
tilexL = -1; /* this forces a refetch of the left most source
samples */
}
if (src[3] != src[4])
{
src[3] += skipped * bpp;
}
else
{
tilexL = -1; /* this forces a refetch of the left most source
samples */
}
if (src[6] != src[7])
{
src[6] += skipped * bpp;
}
else
{
tilexL = -1; /* this forces a refetch of the left most source
samples */
}
src[1] += skipped * bpp;
src[4] += skipped * bpp;
src[7] += skipped * bpp;
src[5] += skipped * bpp;
src[8] += skipped * bpp;
src[2] += skipped * bpp;
src_x += skipped;
if ((src_x / TILE_WIDTH) != tilex0)
{
tile_release (tile[4], FALSE);
if (tile[7])
tile_release (tile[7], FALSE);
if (tile[1])
tile_release (tile[1], FALSE);
tilex0 += 1;
tile[4] = tile_manager_get_tile (info->src_tiles,
src_x, info->src_y,
TRUE, FALSE);
tile[7] = tile_manager_get_tile (info->src_tiles,
src_x, info->src_y + 1,
TRUE, FALSE);
tile[1] = tile_manager_get_tile (info->src_tiles,
src_x, info->src_y - 1,
TRUE, FALSE);
if (! tile[4])
goto done;
src[4] = tile_data_pointer (tile[4], src_x, info->src_y);
if (! tile[7])
{
src[7] = src[4];
}
else
{
src[7] = tile_data_pointer (tile[7],
src_x, info->src_y + 1);
}
if (! tile[1])
{
src[1] = src[4];
}
else
{
src[1] = tile_data_pointer (tile[1],
src_x, info->src_y - 1);
}
}
if (((src_x + 1) / TILE_WIDTH) != tilex1)
{
if (tile[5])
tile_release (tile[5], FALSE);
if (tile[8])
tile_release (tile[8], FALSE);
if (tile[2])
tile_release (tile[2], FALSE);
tilex1 += 1;
tile[5] = tile_manager_get_tile (info->src_tiles,
src_x + 1, info->src_y,
TRUE, FALSE);
tile[8] = tile_manager_get_tile (info->src_tiles,
src_x + 1, info->src_y + 1,
TRUE, FALSE);
tile[2] = tile_manager_get_tile (info->src_tiles,
src_x + 1, info->src_y - 1,
TRUE, FALSE);
if (! tile[5])
{
src[5] = src[4];
}
else
{
src[5] = tile_data_pointer (tile[5],
src_x + 1, info->src_y);
}
if (! tile[8])
{
src[8] = src[7];
}
else
{
src[8] = tile_data_pointer (tile[8],
src_x + 1, info->src_y + 1);
}
if (! tile[2])
{
src[2] = src[1];
}
else
{
src[2] = tile_data_pointer (tile[2],
src_x + 1, info->src_y - 1);
}
}
if (((src_x - 1) / TILE_WIDTH) != tilexL)
{
if (tile[0])
tile_release (tile[0], FALSE);
if (tile[3])
tile_release (tile[3], FALSE);
if (tile[6])
tile_release (tile[6], FALSE);
tilexL += 1;
tile[0] = tile_manager_get_tile (info->src_tiles,
src_x - 1, info->src_y - 1,
TRUE, FALSE);
tile[3] = tile_manager_get_tile (info->src_tiles,
src_x - 1, info->src_y,
TRUE, FALSE);
tile[6] = tile_manager_get_tile (info->src_tiles,
src_x - 1, info->src_y + 1,
TRUE, FALSE);
if (! tile[3])
{
src[3] = src[4];
}
else
{
src[3] = tile_data_pointer (tile[3],
src_x - 1, info->src_y);
}
if (! tile[6])
{
src[6] = src[7];
}
else
{
src[6] = tile_data_pointer (tile[6],
src_x - 1, info->src_y + 1);
}
if (! tile[0])
{
src[0] = src[1];
}
else
{
src[0] = tile_data_pointer (tile[0],
src_x - 1, info->src_y - 1);
}
}
}
}
while (--width);
done:
for (dx = 0; dx < 9; dx++)
if (tile[dx])
tile_release (tile[dx], FALSE);
return tile_buf;
}
static const guchar *
render_image_tile_fault_one_row (RenderInfo *info)
{
/* NOTE: there are some additional overhead that can be factored out
* in the tile administration of this fast path
*/
Tile *tile[3];
const guchar *src[9];
guchar *dest;
gint width;
gint tilex0; /* the current x-tile indice used for the middle
sample pair*/
gint tilex1; /* the current x-tile indice used for the right
sample pair */
gint tilexL; /* the current x-tile indice used for the left
sample pair */
gint bpp;
gint dx;
gint src_x;
gint skipped;
guint left_weight;
guint center_weight;
guint right_weight;
guint top_weight;
guint middle_weight;
guint bottom_weight;
guint source_width;
source_width = tile_manager_width (info->src_tiles);
top_weight = MAX (info->footprint_y / 2,
info->footshift_y > 0 ? info->dy << info->footshift_y
: info->dy >> -info->footshift_y)
- (info->footshift_y > 0 ? info->dy << info->footshift_y
: info->dy >> -info->footshift_y);
bottom_weight = MAX (info->footprint_y / 2,
info->footshift_y > 0 ? info->dy << info->footshift_y
: info->dy >> -info->footshift_y)
- info->footprint_y / 2;
middle_weight = info->footprint_y - top_weight - bottom_weight;
tile[0] = tile_manager_get_tile (info->src_tiles,
info->src_x, info->src_y, TRUE, FALSE);
tile[1] = tile_manager_get_tile (info->src_tiles,
info->src_x + 1, info->src_y, TRUE, FALSE);
tile[2] = tile_manager_get_tile (info->src_tiles,
info->src_x - 1, info->src_y, TRUE, FALSE);
g_return_val_if_fail (tile[0] != NULL, tile_buf);
src[4] = tile_data_pointer (tile[0], info->src_x, info->src_y);
src[7] = tile_data_pointer (tile[0], info->src_x, info->src_y + 1);
if (tile[1])
{
src[5] = tile_data_pointer (tile[1], info->src_x + 1, info->src_y);
src[8] = tile_data_pointer (tile[1], info->src_x + 1, info->src_y + 1);
}
else
{
src[5] = src[4]; /* reusing existing pixel data */
src[8] = src[5]; /* reusing existing pixel data */
}
if (tile[0])
{
src[1] = tile_data_pointer (tile[0], info->src_x, info->src_y - 1);
}
else
{
src[1] = src[4]; /* reusing existing pixel data */
}
if (tile[2])
{
src[0] = tile_data_pointer (tile[2], info->src_x - 1, info->src_y - 1);
}
else
{
src[0] = src[1]; /* reusing existing pixel data */
}
if (tile[1])
{
src[2] = tile_data_pointer (tile[1], info->src_x + 1, info->src_y - 1);
}
else
{
src[2] = src[4]; /* reusing existing pixel data */
}
if (tile[2])
{
src[3] = tile_data_pointer (tile[2], info->src_x - 1, info->src_y);
src[6] = tile_data_pointer (tile[2], info->src_x - 1, info->src_y + 1);
}
else
{
src[3] = src[4]; /* reusing existing pixel data */
src[6] = src[7]; /* reusing existing pixel data */
}
bpp = tile_manager_bpp (info->src_tiles);
dest = tile_buf;
dx = info->dx_start;
src_x = info->src_x;
width = info->w;
tilex0 = info->src_x / TILE_WIDTH;
tilex1 = (info->src_x + 1) / TILE_WIDTH;
tilexL = (info->src_x - 1) / TILE_WIDTH;
do
{
left_weight = MAX (info->footprint_x / 2,
info->footshift_x > 0 ? dx << info->footshift_x
: dx >> -info->footshift_x)
- (info->footshift_x > 0 ? dx << info->footshift_x
: dx >> -info->footshift_x);
right_weight = MAX (info->footprint_x / 2,
info->footshift_x > 0 ? dx << info->footshift_x
: dx >> -info->footshift_x)
- info->footprint_x / 2;
center_weight = info->footprint_x - left_weight - right_weight;
if (src_x + 1 >= source_width)
{
src[2] = src[1];
src[5] = src[4];
src[8] = src[7];
}
if (info->src_is_premult)
box_filter (left_weight, center_weight, right_weight,
top_weight, middle_weight, bottom_weight,
src, dest, bpp);
else
box_filter_premult (left_weight, center_weight, right_weight,
top_weight, middle_weight, bottom_weight,
src, dest, bpp);
dest += bpp;
dx += info->x_dest_inc;
skipped = dx / info->x_src_dec;
if (skipped)
{
dx -= skipped * info->x_src_dec;
/* if we changed integer source pixel coordinates in the source
* buffer, make sure the src pointers (and their backing tiles) are
* correct
*/
if (src[0] != src[1])
{
src[0] += skipped * bpp;
}
else
{
tilexL = -1; /* this forces a refetch of the left most source
samples */
}
if (src[3] != src[4])
{
src[3] += skipped * bpp;
}
else
{
tilexL = -1; /* this forces a refetch of the left most source
samples */
}
if (src[6] != src[7])
{
src[6] += skipped * bpp;
}
else
{
tilexL = -1; /* this forces a refetch of the left most source
samples */
}
src[1] += skipped * bpp;
src[4] += skipped * bpp;
src[7] += skipped * bpp;
src[5] += skipped * bpp;
src[8] += skipped * bpp;
src[2] += skipped * bpp;
src_x += skipped;
if ((src_x / TILE_WIDTH) != tilex0)
{
tile_release (tile[0], FALSE);
tilex0 += 1;
tile[0] = tile_manager_get_tile (info->src_tiles,
src_x, info->src_y, TRUE, FALSE);
if (! tile[0])
goto done;
src[4] = tile_data_pointer (tile[0], src_x, info->src_y);
src[7] = tile_data_pointer (tile[0], src_x, info->src_y + 1);
src[1] = tile_data_pointer (tile[0], src_x, info->src_y - 1);
}
if (((src_x + 1) / TILE_WIDTH) != tilex1)
{
if (tile[1])
tile_release (tile[1], FALSE);
tilex1 += 1;
tile[1] = tile_manager_get_tile (info->src_tiles,
src_x + 1, info->src_y,
TRUE, FALSE);
if (! tile[1])
{
src[5] = src[4];
src[8] = src[7];
src[2] = src[1];
}
else
{
src[5] = tile_data_pointer (tile[1],
src_x + 1, info->src_y);
src[8] = tile_data_pointer (tile[1],
src_x + 1, info->src_y + 1);
src[2] = tile_data_pointer (tile[1],
src_x + 1, info->src_y - 1);
}
}
if (((src_x - 1) / TILE_WIDTH) != tilexL)
{
if (tile[2])
tile_release (tile[2], FALSE);
tilexL += 1;
tile[2] = tile_manager_get_tile (info->src_tiles,
src_x - 1, info->src_y,
TRUE, FALSE);
if (! tile[2])
{
src[3] = src[4];
src[6] = src[7];
src[0] = src[1];
}
else
{
src[3] = tile_data_pointer (tile[2],
src_x - 1, info->src_y);
src[6] = tile_data_pointer (tile[2],
src_x - 1, info->src_y + 1);
src[0] = tile_data_pointer (tile[2],
src_x - 1, info->src_y - 1);
}
}
}
}
while (--width);
done:
for (dx = 0; dx < 3; dx++)
if (tile[dx])
tile_release (tile[dx], FALSE);
return tile_buf;
}
/* function to render a horizontal line of view data */
static const guchar *
render_image_tile_fault_nearest (RenderInfo *info)
{
Tile *tile;
const guchar *src;
guchar *d;
gint width;
gint tilex;
gint bpp;
gint src_x;
gint64 dx;
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, info->src_y);
bpp = tile_manager_bpp (info->src_tiles);
dx = info->dx_start;
width = info->w;
src_x = info->src_x;
tilex = info->src_x / TILE_WIDTH;
d = tile_buf;
do
{
const guchar *s = src;
gint skipped;
if (info->src_is_premult)
{
switch (bpp)
{
case 4:
*d++ = *s++;
case 3:
*d++ = *s++;
case 2:
*d++ = *s++;
case 1:
*d++ = *s++;
}
}
else /* pre-multiply */
{
switch (bpp)
{
case 4:
d[0] = (s[0] * (s[3] + 1)) >> 8;
d[1] = (s[1] * (s[3] + 1)) >> 8;
d[2] = (s[2] * (s[3] + 1)) >> 8;
d[3] = s[3];
d += 4;
s += 4;
break;
case 3:
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
break;
case 2:
d[0] = (s[0] * (s[1] + 1)) >> 8;
d[1] = s[1];
d += 2;
s += 2;
break;
case 1:
*d++ = *s++;
break;
}
}
dx += info->x_dest_inc;
skipped = dx / info->x_src_dec;
if (skipped)
{
src += skipped * bpp;
src_x += skipped;
dx -= skipped * info->x_src_dec;
if ((src_x / TILE_WIDTH) != tilex)
{
tile_release (tile, FALSE);
tilex += 1;
tile = tile_manager_get_tile (info->src_tiles,
src_x, info->src_y, TRUE, FALSE);
if (! tile)
return tile_buf;
src = tile_data_pointer (tile, src_x, info->src_y);
}
}
}
while (--width);
tile_release (tile, FALSE);
return tile_buf;
}