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Diffstat (limited to 'libart_lgpl/art_rgb_a_affine.c')
-rw-r--r-- | libart_lgpl/art_rgb_a_affine.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/libart_lgpl/art_rgb_a_affine.c b/libart_lgpl/art_rgb_a_affine.c deleted file mode 100644 index ff38e2a5eb..0000000000 --- a/libart_lgpl/art_rgb_a_affine.c +++ /dev/null @@ -1,149 +0,0 @@ -/* 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_a_affine.h" - -#include <math.h> - -#include "art_affine.h" -#include "art_point.h" -#include "art_rgb_affine_private.h" - -/* This module handles compositing of affine-transformed alpha only images - over rgb pixel buffers. */ - -/* Composite the source image over the destination image, applying the - affine transform. */ - -/** - * art_rgb_a_affine: Affine transform source Alpha 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 alpha buffer. - * @src_width: Width of source image. - * @src_height: Height of source image. - * @src_rowstride: Rowstride of @src buffer. - * @rgb: RGB foreground color, in 0xRRGGBB. - * @affine: Affine transform. - * @level: Filter level. - * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing. - * - * Affine transform the solid color rgb with alpha specified by the - * source image stored in @src, compositing over the area of destination - * image @dst specified by the rectangle (@x0, @y0) - (@x1, @y1). - * As usual in libart, the left and top edges of this rectangle are - * included, and the right and bottom edges are excluded. - * - * The @alphagamma parameter specifies that the alpha compositing be - * done in a gamma-corrected color space. In the current - * implementation, it is ignored. - * - * The @level parameter specifies the speed/quality tradeoff of the - * image interpolation. Currently, only ART_FILTER_NEAREST is - * implemented. - **/ -void -art_rgb_a_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 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; - int alpha; - art_u8 bg_r, bg_g, bg_b; - art_u8 fg_r, fg_g, fg_b; - int tmp; - int run_x0, run_x1; - art_u8 r, g, b; - - r = (rgb>>16)&0xff; - 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; - if (src_x >= 0 && src_x < src_width && - src_y >= 0 && src_y < src_height) - { - - alpha = *src_p; - if (alpha) - { - if (alpha == 255) - { - dst_p[0] = r; - dst_p[1] = g; - dst_p[2] = b; - } - else - { - bg_r = dst_p[0]; - bg_g = dst_p[1]; - bg_b = dst_p[2]; - - tmp = (r - bg_r) * alpha; - fg_r = bg_r + ((tmp + (tmp >> 8) + 0x80) >> 8); - tmp = (g - bg_g) * alpha; - fg_g = bg_g + ((tmp + (tmp >> 8) + 0x80) >> 8); - tmp = (b - bg_b) * alpha; - fg_b = bg_b + ((tmp + (tmp >> 8) + 0x80) >> 8); - - dst_p[0] = fg_r; - dst_p[1] = fg_g; - dst_p[2] = fg_b; - } - } - } else { dst_p[0] = 255; dst_p[1] = 0; dst_p[2] = 0; } - dst_p += 3; - } - dst_linestart += dst_rowstride; - } -} |