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-rw-r--r--libart_lgpl/art_rgb_bitmap_affine.c198
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diff --git a/libart_lgpl/art_rgb_bitmap_affine.c b/libart_lgpl/art_rgb_bitmap_affine.c
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-/* Libart_LGPL - library of basic graphic primitives
- * Copyright (C) 1998 Raph Levien
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-#include "config.h"
-#include "art_rgb_bitmap_affine.h"
-
-#include <math.h>
-#include "art_misc.h"
-#include "art_point.h"
-#include "art_affine.h"
-#include "art_rgb_affine_private.h"
-
-/* This module handles compositing of affine-transformed bitmap images
- over rgb pixel buffers. */
-
-/* Composite the source image over the destination image, applying the
- affine transform. Foreground color is given and assumed to be
- opaque, background color is assumed to be fully transparent. */
-
-static void
-art_rgb_bitmap_affine_opaque (art_u8 *dst,
- int x0, int y0, int x1, int y1,
- int dst_rowstride,
- const art_u8 *src,
- int src_width, int src_height, int src_rowstride,
- art_u32 rgb,
- const double affine[6],
- ArtFilterLevel level,
- ArtAlphaGamma *alphagamma)
-{
- /* Note: this is a slow implementation, and is missing all filter
- levels other than NEAREST. It is here for clarity of presentation
- and to establish the interface. */
- int x, y;
- double inv[6];
- art_u8 *dst_p, *dst_linestart;
- const art_u8 *src_p;
- ArtPoint pt, src_pt;
- int src_x, src_y;
- art_u8 r, g, b;
- int run_x0, run_x1;
-
- r = rgb >> 16;
- g = (rgb >> 8) & 0xff;
- b = rgb & 0xff;
- dst_linestart = dst;
- art_affine_invert (inv, affine);
- for (y = y0; y < y1; y++)
- {
- pt.y = y + 0.5;
- run_x0 = x0;
- run_x1 = x1;
- art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
- inv);
- dst_p = dst_linestart + (run_x0 - x0) * 3;
- for (x = run_x0; x < run_x1; x++)
- {
- pt.x = x + 0.5;
- art_affine_point (&src_pt, &pt, inv);
- src_x = floor (src_pt.x);
- src_y = floor (src_pt.y);
- src_p = src + (src_y * src_rowstride) + (src_x >> 3);
- if (*src_p & (128 >> (src_x & 7)))
- {
- dst_p[0] = r;
- dst_p[1] = g;
- dst_p[2] = b;
- }
- dst_p += 3;
- }
- dst_linestart += dst_rowstride;
- }
-}
-/* Composite the source image over the destination image, applying the
- affine transform. Foreground color is given, background color is
- assumed to be fully transparent. */
-
-/**
- * art_rgb_bitmap_affine: Affine transform source bitmap image and composite.
- * @dst: Destination image RGB buffer.
- * @x0: Left coordinate of destination rectangle.
- * @y0: Top coordinate of destination rectangle.
- * @x1: Right coordinate of destination rectangle.
- * @y1: Bottom coordinate of destination rectangle.
- * @dst_rowstride: Rowstride of @dst buffer.
- * @src: Source image bitmap buffer.
- * @src_width: Width of source image.
- * @src_height: Height of source image.
- * @src_rowstride: Rowstride of @src buffer.
- * @rgba: RGBA foreground color, in 0xRRGGBBAA.
- * @affine: Affine transform.
- * @level: Filter level.
- * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
- *
- * Affine transform the source image stored in @src, compositing over
- * the area of destination image @dst specified by the rectangle
- * (@x0, @y0) - (@x1, @y1).
- *
- * The source bitmap stored with MSB as the leftmost pixel. Source 1
- * bits correspond to the semitransparent color @rgba, while source 0
- * bits are transparent.
- *
- * See art_rgb_affine() for a description of additional parameters.
- **/
-void
-art_rgb_bitmap_affine (art_u8 *dst,
- int x0, int y0, int x1, int y1, int dst_rowstride,
- const art_u8 *src,
- int src_width, int src_height, int src_rowstride,
- art_u32 rgba,
- const double affine[6],
- ArtFilterLevel level,
- ArtAlphaGamma *alphagamma)
-{
- /* Note: this is a slow implementation, and is missing all filter
- levels other than NEAREST. It is here for clarity of presentation
- and to establish the interface. */
- int x, y;
- double inv[6];
- art_u8 *dst_p, *dst_linestart;
- const art_u8 *src_p;
- ArtPoint pt, src_pt;
- int src_x, src_y;
- int alpha;
- art_u8 bg_r, bg_g, bg_b;
- art_u8 fg_r, fg_g, fg_b;
- art_u8 r, g, b;
- int run_x0, run_x1;
-
- alpha = rgba & 0xff;
- if (alpha == 0xff)
- {
- art_rgb_bitmap_affine_opaque (dst, x0, y0, x1, y1, dst_rowstride,
- src,
- src_width, src_height, src_rowstride,
- rgba >> 8,
- affine,
- level,
- alphagamma);
- return;
- }
- /* alpha = (65536 * alpha) / 255; */
- alpha = (alpha << 8) + alpha + (alpha >> 7);
- r = rgba >> 24;
- g = (rgba >> 16) & 0xff;
- b = (rgba >> 8) & 0xff;
- dst_linestart = dst;
- art_affine_invert (inv, affine);
- for (y = y0; y < y1; y++)
- {
- pt.y = y + 0.5;
- run_x0 = x0;
- run_x1 = x1;
- art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
- inv);
- dst_p = dst_linestart + (run_x0 - x0) * 3;
- for (x = run_x0; x < run_x1; x++)
- {
- pt.x = x + 0.5;
- art_affine_point (&src_pt, &pt, inv);
- src_x = floor (src_pt.x);
- src_y = floor (src_pt.y);
- src_p = src + (src_y * src_rowstride) + (src_x >> 3);
- if (*src_p & (128 >> (src_x & 7)))
- {
- bg_r = dst_p[0];
- bg_g = dst_p[1];
- bg_b = dst_p[2];
-
- fg_r = bg_r + (((r - bg_r) * alpha + 0x8000) >> 16);
- fg_g = bg_g + (((g - bg_g) * alpha + 0x8000) >> 16);
- fg_b = bg_b + (((b - bg_b) * alpha + 0x8000) >> 16);
-
- dst_p[0] = fg_r;
- dst_p[1] = fg_g;
- dst_p[2] = fg_b;
- }
- dst_p += 3;
- }
- dst_linestart += dst_rowstride;
- }
-}
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