mirror of https://github.com/GNOME/gimp.git
863 lines
18 KiB
C
863 lines
18 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "appenv.h"
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#include "gimprc.h"
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#include "gximage.h"
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#include "image_render.h"
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#include "pixel_region.h"
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#include "scale.h"
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#include "tile.h" /* ick. */
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typedef struct _RenderInfo RenderInfo;
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typedef void (*RenderFunc) (RenderInfo *info);
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struct _RenderInfo
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{
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GDisplay *gdisp;
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TileManager *src_tiles;
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guint *alpha;
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guchar *scale;
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guchar *src;
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guchar *dest;
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int x, y;
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int w, h;
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float scalex;
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float scaley;
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int src_x, src_y;
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int src_bpp;
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int dest_bpp;
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int dest_bpl;
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int dest_width;
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int byte_order;
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};
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/* accelerate transparency of image scaling */
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guchar *blend_dark_check = NULL;
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guchar *blend_light_check = NULL;
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guchar *tile_buf = NULL;
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guchar *check_buf = NULL;
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guchar *empty_buf = NULL;
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guchar *temp_buf = NULL;
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static guint check_mod;
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static guint check_shift;
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static guint tile_shift;
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static guchar check_combos[6][2] =
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{
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{ 204, 255 },
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{ 102, 153 },
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{ 0, 51 },
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{ 255, 255 },
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{ 127, 127 },
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{ 0, 0 }
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};
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void
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render_setup (int check_type,
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int check_size)
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{
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int i, j;
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/* based on the tile size, determine the tile shift amount
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* (assume here that tile_height and tile_width are equal)
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*/
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tile_shift = 0;
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while ((1 << tile_shift) < TILE_WIDTH)
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tile_shift++;
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/* allocate a buffer for arranging information from a row of tiles */
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if (!tile_buf)
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tile_buf = g_new (guchar, GXIMAGE_WIDTH * MAX_CHANNELS);
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if (check_type < 0 || check_type > 5)
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g_error ("invalid check_type argument to render_setup: %d", check_type);
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if (check_size < 0 || check_size > 2)
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g_error ("invalid check_size argument to render_setup: %d", check_size);
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if (!blend_dark_check)
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blend_dark_check = g_new (guchar, 65536);
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if (!blend_light_check)
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blend_light_check = g_new (guchar, 65536);
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for (i = 0; i < 256; i++)
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for (j = 0; j < 256; j++)
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{
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blend_dark_check [(i << 8) + j] = (guchar)
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((j * i + check_combos[check_type][0] * (255 - i)) / 255);
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blend_light_check [(i << 8) + j] = (guchar)
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((j * i + check_combos[check_type][1] * (255 - i)) / 255);
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}
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switch (check_size)
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{
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case SMALL_CHECKS:
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check_mod = 0x3;
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check_shift = 2;
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break;
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case MEDIUM_CHECKS:
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check_mod = 0x7;
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check_shift = 3;
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break;
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case LARGE_CHECKS:
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check_mod = 0xf;
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check_shift = 4;
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break;
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}
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/* calculate check buffer for previews */
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if (preview_size)
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{
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if (check_buf)
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g_free (check_buf);
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if (empty_buf)
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g_free (empty_buf);
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if (temp_buf)
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g_free (temp_buf);
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check_buf = (unsigned char *) g_malloc ((preview_size + 4) * 3);
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for (i = 0; i < (preview_size + 4); i++)
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{
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if (i & 0x4)
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{
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check_buf[i * 3 + 0] = blend_dark_check[0];
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check_buf[i * 3 + 1] = blend_dark_check[0];
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check_buf[i * 3 + 2] = blend_dark_check[0];
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}
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else
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{
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check_buf[i * 3 + 0] = blend_light_check[0];
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check_buf[i * 3 + 1] = blend_light_check[0];
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check_buf[i * 3 + 2] = blend_light_check[0];
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}
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}
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empty_buf = (unsigned char *) g_malloc ((preview_size + 4) * 3);
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memset (empty_buf, 0, (preview_size + 4) * 3);
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temp_buf = (unsigned char *) g_malloc ((preview_size + 4) * 3);
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}
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else
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{
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check_buf = NULL;
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empty_buf = NULL;
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temp_buf = NULL;
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}
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}
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void
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render_free (void)
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{
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g_free (tile_buf);
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g_free (check_buf);
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}
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/* Render Image functions */
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static void render_image_rgb (RenderInfo *info);
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static void render_image_rgb_a (RenderInfo *info);
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static void render_image_gray (RenderInfo *info);
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static void render_image_gray_a (RenderInfo *info);
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static void render_image_indexed (RenderInfo *info);
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static void render_image_indexed_a (RenderInfo *info);
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static void render_image_init_info (RenderInfo *info,
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GDisplay *gdisp,
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int x,
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int y,
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int w,
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int h);
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static guint* render_image_init_alpha (int mult);
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static guchar* render_image_accelerate_scaling (int width,
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int start,
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float scalex);
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static guchar* render_image_tile_fault (RenderInfo *info);
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static RenderFunc render_funcs[6] =
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{
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render_image_rgb,
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render_image_rgb_a,
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render_image_gray,
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render_image_gray_a,
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render_image_indexed,
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render_image_indexed_a,
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};
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/*****************************************************************/
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/* This function is the core of the display--it offsets and */
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/* scales the image according to the current parameters in the */
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/* gdisp object. It handles color, grayscale, 8, 15, 16, 24, */
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/* & 32 bit output depths. */
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/*****************************************************************/
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void
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render_image (GDisplay *gdisp,
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int x,
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int y,
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int w,
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int h)
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{
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RenderInfo info;
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int image_type;
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render_image_init_info (&info, gdisp, x, y, w, h);
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image_type = gimage_projection_type (gdisp->gimage);
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if ((image_type < 0) || (image_type > 5))
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{
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g_message ("unknown gimage projection type: %d",
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gimage_projection_type (gdisp->gimage));
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return;
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}
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if ((info.dest_bpp < 1) || (info.dest_bpp > 4))
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{
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g_message ("unsupported destination bytes per pixel: %d", info.dest_bpp);
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return;
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}
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/* Currently, only RGBA and GRAYA projection types are used - the rest
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* are in case of future need. -- austin, 28th Nov 1998. */
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if (image_type != RGBA_GIMAGE && image_type != GRAYA_GIMAGE)
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g_warning ("using untested projection type %d", image_type);
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(* render_funcs[image_type]) (&info);
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}
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/*************************/
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/* 8 Bit functions */
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/*************************/
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static void
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render_image_indexed (RenderInfo *info)
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{
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guchar *src;
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guchar *dest;
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guchar *cmap;
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gulong val;
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int byte_order;
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int y, ye;
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int x, xe;
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int initial;
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float error;
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float step;
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cmap = gimage_cmap (info->gdisp->gimage);
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y = info->y;
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ye = info->y + info->h;
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xe = info->x + info->w;
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step = 1.0 / info->scaley;
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error = y * step;
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error -= ((int)error) - step;
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initial = TRUE;
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byte_order = info->byte_order;
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info->src = render_image_tile_fault (info);
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for (; y < ye; y++)
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{
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if (!initial && (error < 1.0))
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memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
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else
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{
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src = info->src;
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dest = info->dest;
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g_return_if_fail (src != NULL);
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for (x = info->x; x < xe; x++)
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{
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val = src[INDEXED_PIX] * 3;
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src += 1;
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dest[0] = cmap[val+0];
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dest[1] = cmap[val+1];
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dest[2] = cmap[val+2];
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dest += 3;
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}
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}
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info->dest += info->dest_bpl;
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initial = FALSE;
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if (error >= 1.0)
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{
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info->src_y += (int)error;
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error -= (int)error;
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info->src = render_image_tile_fault (info);
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initial = TRUE;
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}
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error += step;
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}
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}
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static void
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render_image_indexed_a (RenderInfo *info)
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{
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guchar *src;
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guchar *dest;
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guint *alpha;
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guchar *cmap;
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gulong r, g, b;
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gulong val;
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guint a;
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int dark_light;
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int byte_order;
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int y, ye;
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int x, xe;
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int initial;
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float error;
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float step;
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cmap = gimage_cmap (info->gdisp->gimage);
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alpha = info->alpha;
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y = info->y;
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ye = info->y + info->h;
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xe = info->x + info->w;
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step = 1.0 / info->scaley;
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error = y * step;
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error -= ((int)error) - step;
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initial = TRUE;
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byte_order = info->byte_order;
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info->src = render_image_tile_fault (info);
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for (; y < ye; y++)
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{
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if (!initial && (error < 1.0) && (y & check_mod))
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memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
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else
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{
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src = info->src;
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dest = info->dest;
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dark_light = (y >> check_shift) + (info->x >> check_shift);
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g_return_if_fail (src != NULL);
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for (x = info->x; x < xe; x++)
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{
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a = alpha[src[ALPHA_I_PIX]];
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val = src[INDEXED_PIX] * 3;
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src += 2;
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if (dark_light & 0x1)
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{
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r = blend_dark_check[(a | cmap[val+0])];
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g = blend_dark_check[(a | cmap[val+1])];
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b = blend_dark_check[(a | cmap[val+2])];
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}
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else
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{
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r = blend_light_check[(a | cmap[val+0])];
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g = blend_light_check[(a | cmap[val+1])];
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b = blend_light_check[(a | cmap[val+2])];
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}
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dest[0] = r;
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dest[1] = g;
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dest[2] = b;
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dest += 3;
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if (((x + 1) & check_mod) == 0)
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dark_light += 1;
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}
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}
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info->dest += info->dest_bpl;
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initial = FALSE;
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if (error >= 1.0)
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{
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info->src_y += (int)error;
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error -= (int)error;
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info->src = render_image_tile_fault (info);
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initial = TRUE;
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}
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error += step;
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}
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}
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static void
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render_image_gray (RenderInfo *info)
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{
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guchar *src;
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guchar *dest;
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gulong val;
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int byte_order;
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int y, ye;
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int x, xe;
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int initial;
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float error;
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float step;
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y = info->y;
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ye = info->y + info->h;
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xe = info->x + info->w;
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step = 1.0 / info->scaley;
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error = y * step;
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error -= ((int)error) - step;
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initial = TRUE;
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byte_order = info->byte_order;
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info->src = render_image_tile_fault (info);
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for (; y < ye; y++)
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{
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if (!initial && (error < 1.0))
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memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
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else
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{
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src = info->src;
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dest = info->dest;
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g_return_if_fail (src != NULL);
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for (x = info->x; x < xe; x++)
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{
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val = src[GRAY_PIX];
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src += 1;
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dest[0] = val;
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dest[1] = val;
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dest[2] = val;
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dest += 3;
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}
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}
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info->dest += info->dest_bpl;
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initial = FALSE;
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if (error >= 1.0)
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{
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info->src_y += (int)error;
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error -= (int)error;
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info->src = render_image_tile_fault (info);
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initial = TRUE;
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}
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error += step;
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}
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}
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static void
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render_image_gray_a (RenderInfo *info)
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{
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guchar *src;
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guchar *dest;
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guint *alpha;
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gulong val;
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guint a;
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int dark_light;
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int byte_order;
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int y, ye;
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int x, xe;
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int initial;
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float error;
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float step;
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alpha = info->alpha;
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y = info->y;
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ye = info->y + info->h;
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xe = info->x + info->w;
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step = 1.0 / info->scaley;
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error = y * step;
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error -= ((int)error) - step;
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initial = TRUE;
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byte_order = info->byte_order;
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info->src = render_image_tile_fault (info);
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for (; y < ye; y++)
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{
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if (!initial && (error < 1.0) && (y & check_mod))
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memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
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else
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{
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src = info->src;
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dest = info->dest;
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dark_light = (y >> check_shift) + (info->x >> check_shift);
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g_return_if_fail (src != NULL);
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for (x = info->x; x < xe; x++)
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{
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a = alpha[src[ALPHA_G_PIX]];
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if (dark_light & 0x1)
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val = blend_dark_check[(a | src[GRAY_PIX])];
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else
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val = blend_light_check[(a | src[GRAY_PIX])];
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src += 2;
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dest[0] = val;
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dest[1] = val;
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dest[2] = val;
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dest += 3;
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if (((x + 1) & check_mod) == 0)
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dark_light += 1;
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}
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}
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info->dest += info->dest_bpl;
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initial = FALSE;
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if (error >= 1.0)
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{
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info->src_y += (int)error;
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error -= (int)error;
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info->src = render_image_tile_fault (info);
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initial = TRUE;
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}
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error += step;
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}
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}
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static void
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render_image_rgb (RenderInfo *info)
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{
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guchar *src;
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guchar *dest;
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int byte_order;
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int y, ye;
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int x, xe;
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int initial;
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float error;
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float step;
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y = info->y;
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ye = info->y + info->h;
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xe = info->x + info->w;
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step = 1.0 / info->scaley;
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error = y * step;
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error -= (int)error - step;
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initial = TRUE;
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byte_order = info->byte_order;
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info->src = render_image_tile_fault (info);
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for (; y < ye; y++)
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{
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|
if (!initial && (error < 1.0))
|
|
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
|
|
else
|
|
{
|
|
src = info->src;
|
|
dest = info->dest;
|
|
|
|
g_return_if_fail (src != NULL);
|
|
|
|
/* replace this with memcpy, or better yet, avoid it altogether? */
|
|
for (x = info->x; x < xe; x++)
|
|
{
|
|
dest[0] = src[0];
|
|
dest[1] = src[1];
|
|
dest[2] = src[2];
|
|
|
|
src += 3;
|
|
dest += 3;
|
|
}
|
|
}
|
|
|
|
info->dest += info->dest_bpl;
|
|
|
|
initial = FALSE;
|
|
|
|
if (error >= 1.0)
|
|
{
|
|
info->src_y += (int)error;
|
|
error -= (int)error;
|
|
info->src = render_image_tile_fault (info);
|
|
initial = TRUE;
|
|
}
|
|
|
|
error += step;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
render_image_rgb_a (RenderInfo *info)
|
|
{
|
|
guchar *src;
|
|
guchar *dest;
|
|
guint *alpha;
|
|
gulong r, g, b;
|
|
guint a;
|
|
int dark_light;
|
|
int byte_order;
|
|
int y, ye;
|
|
int x, xe;
|
|
int initial;
|
|
float error;
|
|
float step;
|
|
|
|
alpha = info->alpha;
|
|
|
|
y = info->y;
|
|
ye = info->y + info->h;
|
|
xe = info->x + info->w;
|
|
|
|
step = 1.0 / info->scaley;
|
|
|
|
error = y * step;
|
|
error -= ((int)error) - step;
|
|
|
|
initial = TRUE;
|
|
byte_order = info->byte_order;
|
|
info->src = render_image_tile_fault (info);
|
|
|
|
for (; y < ye; y++)
|
|
{
|
|
if (!initial && (error < 1.0) && (y & check_mod))
|
|
memcpy (info->dest, info->dest - info->dest_bpl, info->dest_width);
|
|
else
|
|
{
|
|
src = info->src;
|
|
dest = info->dest;
|
|
|
|
dark_light = (y >> check_shift) + (info->x >> check_shift);
|
|
|
|
g_return_if_fail (src != NULL);
|
|
|
|
for (x = info->x; x < xe; x++)
|
|
{
|
|
a = alpha[src[ALPHA_PIX]];
|
|
if (dark_light & 0x1)
|
|
{
|
|
r = blend_dark_check[(a | src[RED_PIX])];
|
|
g = blend_dark_check[(a | src[GREEN_PIX])];
|
|
b = blend_dark_check[(a | src[BLUE_PIX])];
|
|
}
|
|
else
|
|
{
|
|
r = blend_light_check[(a | src[RED_PIX])];
|
|
g = blend_light_check[(a | src[GREEN_PIX])];
|
|
b = 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;
|
|
}
|
|
}
|
|
|
|
info->dest += info->dest_bpl;
|
|
|
|
initial = FALSE;
|
|
|
|
if (error >= 1.0)
|
|
{
|
|
info->src_y += (int)error;
|
|
error -= (int)error;
|
|
info->src = render_image_tile_fault (info);
|
|
initial = TRUE;
|
|
}
|
|
|
|
error += step;
|
|
}
|
|
}
|
|
|
|
static void
|
|
render_image_init_info (RenderInfo *info,
|
|
GDisplay *gdisp,
|
|
int x,
|
|
int y,
|
|
int w,
|
|
int h)
|
|
{
|
|
info->gdisp = gdisp;
|
|
info->src_tiles = gimage_projection (gdisp->gimage);
|
|
info->x = x + gdisp->offset_x;
|
|
info->y = y + gdisp->offset_y;
|
|
info->w = w;
|
|
info->h = h;
|
|
info->scalex = SCALEFACTOR_X (gdisp);
|
|
info->scaley = SCALEFACTOR_Y (gdisp);
|
|
info->src_x = UNSCALEX (gdisp, info->x);
|
|
info->src_y = UNSCALEY (gdisp, info->y);
|
|
info->src_bpp = gimage_projection_bytes (gdisp->gimage);
|
|
info->dest = gximage_get_data ();
|
|
info->dest_bpp = gximage_get_bpp ();
|
|
info->dest_bpl = gximage_get_bpl ();
|
|
info->dest_width = info->w * info->dest_bpp;
|
|
info->byte_order = gximage_get_byte_order ();
|
|
info->scale = render_image_accelerate_scaling (w, info->x, info->scalex);
|
|
info->alpha = NULL;
|
|
|
|
switch (gimage_projection_type (gdisp->gimage))
|
|
{
|
|
case RGBA_GIMAGE:
|
|
case GRAYA_GIMAGE:
|
|
case INDEXEDA_GIMAGE:
|
|
info->alpha = render_image_init_alpha (gimage_projection_opacity (gdisp->gimage));
|
|
break;
|
|
default:
|
|
/* nothing special needs doing */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static guint*
|
|
render_image_init_alpha (int mult)
|
|
{
|
|
static guint *alpha_mult = NULL;
|
|
static int alpha_val = -1;
|
|
int 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 (int width,
|
|
int start,
|
|
float scalex)
|
|
{
|
|
static guchar *scale = NULL;
|
|
float error;
|
|
float step;
|
|
int i;
|
|
|
|
if (!scale)
|
|
scale = g_new (guchar, GXIMAGE_WIDTH + 1);
|
|
|
|
step = 1.0 / scalex;
|
|
|
|
error = start * step;
|
|
error -= ((int)error) - step;
|
|
|
|
for (i = 0; i <= width; i++)
|
|
{
|
|
scale[i] = ((int)error);
|
|
error += step - (int)error;
|
|
}
|
|
|
|
return scale;
|
|
}
|
|
|
|
static guchar*
|
|
render_image_tile_fault (RenderInfo *info)
|
|
{
|
|
Tile *tile;
|
|
guchar *data;
|
|
guchar *dest;
|
|
guchar *scale;
|
|
int width;
|
|
int tilex;
|
|
int tiley;
|
|
int srctilex, srctiley;
|
|
int step;
|
|
int bpp = info->src_bpp;
|
|
int x, b;
|
|
|
|
tilex = info->src_x / TILE_WIDTH;
|
|
tiley = info->src_y / TILE_HEIGHT;
|
|
|
|
tile = tile_manager_get_tile (info->src_tiles,
|
|
srctilex=info->src_x, srctiley=info->src_y,
|
|
TRUE, FALSE);
|
|
if (!tile)
|
|
return NULL;
|
|
|
|
data = 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;
|
|
|
|
while (width--)
|
|
{
|
|
for (b = 0; b < bpp; b++)
|
|
*dest++ = data[b];
|
|
|
|
step = *scale++;
|
|
if (step != 0)
|
|
{
|
|
x += step;
|
|
data += step * bpp;
|
|
|
|
if ((x >> tile_shift) != tilex)
|
|
{
|
|
tile_release (tile, FALSE);
|
|
tilex += 1;
|
|
|
|
tile = tile_manager_get_tile (info->src_tiles, srctilex=x,
|
|
srctiley=info->src_y, TRUE, FALSE);
|
|
if (!tile)
|
|
return tile_buf;
|
|
|
|
data = tile_data_pointer (tile,
|
|
x % TILE_WIDTH,
|
|
info->src_y % TILE_HEIGHT);
|
|
}
|
|
}
|
|
}
|
|
|
|
tile_release (tile, FALSE);
|
|
return tile_buf;
|
|
}
|