From 28a029a4990d2a84f9d6a0b890eba812ea503998 Mon Sep 17 00:00:00 2001 From: Perberos Date: Thu, 1 Dec 2011 23:52:01 -0300 Subject: moving from https://github.com/perberos/mate-desktop-environment --- src/ui/gradient.c | 842 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 842 insertions(+) create mode 100644 src/ui/gradient.c (limited to 'src/ui/gradient.c') diff --git a/src/ui/gradient.c b/src/ui/gradient.c new file mode 100644 index 00000000..0e739817 --- /dev/null +++ b/src/ui/gradient.c @@ -0,0 +1,842 @@ +/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ + +/* Marco gradient rendering */ + +/* + * Copyright (C) 2001 Havoc Pennington, 99% copied from wrlib in + * WindowMaker, Copyright (C) 1997-2000 Dan Pascu and Alfredo Kojima + * Copyright (C) 2005 Elijah Newren + * + * 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 "gradient.h" +#include "util.h" +#include + +/* This is all Alfredo's and Dan's usual very nice WindowMaker code, + * slightly GTK-ized + */ +static GdkPixbuf* meta_gradient_create_horizontal (int width, + int height, + const GdkColor *from, + const GdkColor *to); +static GdkPixbuf* meta_gradient_create_vertical (int width, + int height, + const GdkColor *from, + const GdkColor *to); +static GdkPixbuf* meta_gradient_create_diagonal (int width, + int height, + const GdkColor *from, + const GdkColor *to); +static GdkPixbuf* meta_gradient_create_multi_horizontal (int width, + int height, + const GdkColor *colors, + int count); +static GdkPixbuf* meta_gradient_create_multi_vertical (int width, + int height, + const GdkColor *colors, + int count); +static GdkPixbuf* meta_gradient_create_multi_diagonal (int width, + int height, + const GdkColor *colors, + int count); + + +/* Used as the destroy notification function for gdk_pixbuf_new() */ +static void +free_buffer (guchar *pixels, gpointer data) +{ + g_free (pixels); +} + +static GdkPixbuf* +blank_pixbuf (int width, int height, gboolean no_padding) +{ + guchar *buf; + int rowstride; + + g_return_val_if_fail (width > 0, NULL); + g_return_val_if_fail (height > 0, NULL); + + if (no_padding) + rowstride = width * 3; + else + /* Always align rows to 32-bit boundaries */ + rowstride = 4 * ((3 * width + 3) / 4); + + buf = g_try_malloc (height * rowstride); + if (!buf) + return NULL; + + return gdk_pixbuf_new_from_data (buf, GDK_COLORSPACE_RGB, + FALSE, 8, + width, height, rowstride, + free_buffer, NULL); +} + +GdkPixbuf* +meta_gradient_create_simple (int width, + int height, + const GdkColor *from, + const GdkColor *to, + MetaGradientType style) +{ + switch (style) + { + case META_GRADIENT_HORIZONTAL: + return meta_gradient_create_horizontal (width, height, + from, to); + case META_GRADIENT_VERTICAL: + return meta_gradient_create_vertical (width, height, + from, to); + + case META_GRADIENT_DIAGONAL: + return meta_gradient_create_diagonal (width, height, + from, to); + case META_GRADIENT_LAST: + break; + } + g_assert_not_reached (); + return NULL; +} + +GdkPixbuf* +meta_gradient_create_multi (int width, + int height, + const GdkColor *colors, + int n_colors, + MetaGradientType style) +{ + + if (n_colors > 2) + { + switch (style) + { + case META_GRADIENT_HORIZONTAL: + return meta_gradient_create_multi_horizontal (width, height, colors, n_colors); + case META_GRADIENT_VERTICAL: + return meta_gradient_create_multi_vertical (width, height, colors, n_colors); + case META_GRADIENT_DIAGONAL: + return meta_gradient_create_multi_diagonal (width, height, colors, n_colors); + case META_GRADIENT_LAST: + g_assert_not_reached (); + break; + } + } + else if (n_colors > 1) + { + return meta_gradient_create_simple (width, height, &colors[0], &colors[1], + style); + } + else if (n_colors > 0) + { + return meta_gradient_create_simple (width, height, &colors[0], &colors[0], + style); + } + g_assert_not_reached (); + return NULL; +} + +/* Interwoven essentially means we have two vertical gradients, + * cut into horizontal strips of the given thickness, and then the strips + * are alternated. I'm not sure what it's good for, just copied since + * WindowMaker had it. + */ +GdkPixbuf* +meta_gradient_create_interwoven (int width, + int height, + const GdkColor colors1[2], + int thickness1, + const GdkColor colors2[2], + int thickness2) +{ + + int i, j, k, l, ll; + long r1, g1, b1, dr1, dg1, db1; + long r2, g2, b2, dr2, dg2, db2; + GdkPixbuf *pixbuf; + unsigned char *ptr; + unsigned char *pixels; + int rowstride; + + pixbuf = blank_pixbuf (width, height, FALSE); + if (pixbuf == NULL) + return NULL; + + pixels = gdk_pixbuf_get_pixels (pixbuf); + rowstride = gdk_pixbuf_get_rowstride (pixbuf); + + r1 = colors1[0].red<<8; + g1 = colors1[0].green<<8; + b1 = colors1[0].blue<<8; + + r2 = colors2[0].red<<8; + g2 = colors2[0].green<<8; + b2 = colors2[0].blue<<8; + + dr1 = ((colors1[1].red-colors1[0].red)<<8)/(int)height; + dg1 = ((colors1[1].green-colors1[0].green)<<8)/(int)height; + db1 = ((colors1[1].blue-colors1[0].blue)<<8)/(int)height; + + dr2 = ((colors2[1].red-colors2[0].red)<<8)/(int)height; + dg2 = ((colors2[1].green-colors2[0].green)<<8)/(int)height; + db2 = ((colors2[1].blue-colors2[0].blue)<<8)/(int)height; + + for (i=0,k=0,l=0,ll=thickness1; i>16); + ptr[1] = (unsigned char) (g1>>16); + ptr[2] = (unsigned char) (b1>>16); + } + else + { + ptr[0] = (unsigned char) (r2>>16); + ptr[1] = (unsigned char) (g2>>16); + ptr[2] = (unsigned char) (b2>>16); + } + + for (j=1; j <= width/2; j *= 2) + memcpy (&(ptr[j*3]), ptr, j*3); + memcpy (&(ptr[j*3]), ptr, (width - j)*3); + + if (++l == ll) + { + if (k == 0) + { + k = 1; + ll = thickness2; + } + else + { + k = 0; + ll = thickness1; + } + l = 0; + } + r1+=dr1; + g1+=dg1; + b1+=db1; + + r2+=dr2; + g2+=dg2; + b2+=db2; + } + + return pixbuf; +} + +/* + *---------------------------------------------------------------------- + * meta_gradient_create_horizontal-- + * Renders a horizontal linear gradient of the specified size in the + * GdkPixbuf format with a border of the specified type. + * + * Returns: + * A 24bit GdkPixbuf with the gradient (no alpha channel). + * + * Side effects: + * None + *---------------------------------------------------------------------- + */ +static GdkPixbuf* +meta_gradient_create_horizontal (int width, int height, + const GdkColor *from, + const GdkColor *to) +{ + int i; + long r, g, b, dr, dg, db; + GdkPixbuf *pixbuf; + unsigned char *ptr; + unsigned char *pixels; + int r0, g0, b0; + int rf, gf, bf; + int rowstride; + + pixbuf = blank_pixbuf (width, height, FALSE); + if (pixbuf == NULL) + return NULL; + + pixels = gdk_pixbuf_get_pixels (pixbuf); + ptr = pixels; + rowstride = gdk_pixbuf_get_rowstride (pixbuf); + + r0 = (guchar) (from->red / 256.0); + g0 = (guchar) (from->green / 256.0); + b0 = (guchar) (from->blue / 256.0); + rf = (guchar) (to->red / 256.0); + gf = (guchar) (to->green / 256.0); + bf = (guchar) (to->blue / 256.0); + + r = r0 << 16; + g = g0 << 16; + b = b0 << 16; + + dr = ((rf-r0)<<16)/(int)width; + dg = ((gf-g0)<<16)/(int)width; + db = ((bf-b0)<<16)/(int)width; + /* render the first line */ + for (i=0; i>16); + *(ptr++) = (unsigned char)(g>>16); + *(ptr++) = (unsigned char)(b>>16); + r += dr; + g += dg; + b += db; + } + + /* copy the first line to the other lines */ + for (i=1; ired / 256.0); + g0 = (guchar) (from->green / 256.0); + b0 = (guchar) (from->blue / 256.0); + rf = (guchar) (to->red / 256.0); + gf = (guchar) (to->green / 256.0); + bf = (guchar) (to->blue / 256.0); + + r = r0<<16; + g = g0<<16; + b = b0<<16; + + dr = ((rf-r0)<<16)/(int)height; + dg = ((gf-g0)<<16)/(int)height; + db = ((bf-b0)<<16)/(int)height; + + for (i=0; i>16); + ptr[1] = (unsigned char)(g>>16); + ptr[2] = (unsigned char)(b>>16); + + for (j=1; j <= width/2; j *= 2) + memcpy (&(ptr[j*3]), ptr, j*3); + memcpy (&(ptr[j*3]), ptr, (width - j)*3); + + r+=dr; + g+=dg; + b+=db; + } + return pixbuf; +} + + +/* + *---------------------------------------------------------------------- + * meta_gradient_create_diagonal-- + * Renders a diagonal linear gradient of the specified size in the + * GdkPixbuf format with a border of the specified type. + * + * Returns: + * A 24bit GdkPixbuf with the gradient (no alpha channel). + * + * Side effects: + * None + *---------------------------------------------------------------------- + */ + + +static GdkPixbuf* +meta_gradient_create_diagonal (int width, int height, + const GdkColor *from, + const GdkColor *to) +{ + GdkPixbuf *pixbuf, *tmp; + int j; + float a, offset; + unsigned char *ptr; + unsigned char *pixels; + int rowstride; + + if (width == 1) + return meta_gradient_create_vertical (width, height, from, to); + else if (height == 1) + return meta_gradient_create_horizontal (width, height, from, to); + + pixbuf = blank_pixbuf (width, height, FALSE); + if (pixbuf == NULL) + return NULL; + + pixels = gdk_pixbuf_get_pixels (pixbuf); + rowstride = gdk_pixbuf_get_rowstride (pixbuf); + + tmp = meta_gradient_create_horizontal (2*width-1, 1, from, to); + if (!tmp) + { + g_object_unref (G_OBJECT (pixbuf)); + return NULL; + } + + ptr = gdk_pixbuf_get_pixels (tmp); + + a = ((float)(width - 1))/((float)(height - 1)); + width = width * 3; + + /* copy the first line to the other lines with corresponding offset */ + for (j=0, offset=0.0; j 2, NULL); + + pixbuf = blank_pixbuf (width, height, FALSE); + if (pixbuf == NULL) + return NULL; + + pixels = gdk_pixbuf_get_pixels (pixbuf); + rowstride = gdk_pixbuf_get_rowstride (pixbuf); + ptr = pixels; + + if (count > width) + count = width; + + if (count > 1) + width2 = width/(count-1); + else + width2 = width; + + k = 0; + + r = colors[0].red << 8; + g = colors[0].green << 8; + b = colors[0].blue << 8; + + /* render the first line */ + for (i=1; i>16); + *ptr++ = (unsigned char)(g>>16); + *ptr++ = (unsigned char)(b>>16); + r += dr; + g += dg; + b += db; + k++; + } + r = colors[i].red << 8; + g = colors[i].green << 8; + b = colors[i].blue << 8; + } + for (j=k; j>16); + *ptr++ = (unsigned char)(g>>16); + *ptr++ = (unsigned char)(b>>16); + } + + /* copy the first line to the other lines */ + for (i=1; i 2, NULL); + + pixbuf = blank_pixbuf (width, height, FALSE); + if (pixbuf == NULL) + return NULL; + + pixels = gdk_pixbuf_get_pixels (pixbuf); + rowstride = gdk_pixbuf_get_rowstride (pixbuf); + ptr = pixels; + + if (count > height) + count = height; + + if (count > 1) + height2 = height/(count-1); + else + height2 = height; + + k = 0; + + r = colors[0].red << 8; + g = colors[0].green << 8; + b = colors[0].blue << 8; + + for (i=1; i>16); + ptr[1] = (unsigned char)(g>>16); + ptr[2] = (unsigned char)(b>>16); + + for (x=1; x <= width/2; x *= 2) + memcpy (&(ptr[x*3]), ptr, x*3); + memcpy (&(ptr[x*3]), ptr, (width - x)*3); + + ptr += rowstride; + + r += dr; + g += dg; + b += db; + k++; + } + r = colors[i].red << 8; + g = colors[i].green << 8; + b = colors[i].blue << 8; + } + + if (k>16); + ptr[1] = (unsigned char) (g>>16); + ptr[2] = (unsigned char) (b>>16); + + for (x=1; x <= width/2; x *= 2) + memcpy (&(ptr[x*3]), ptr, x*3); + memcpy (&(ptr[x*3]), ptr, (width - x)*3); + + ptr += rowstride; + + for (j=k+1; j 2, NULL); + + if (width == 1) + return meta_gradient_create_multi_vertical (width, height, colors, count); + else if (height == 1) + return meta_gradient_create_multi_horizontal (width, height, colors, count); + + pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, + width, height); + if (pixbuf == NULL) + return NULL; + + pixels = gdk_pixbuf_get_pixels (pixbuf); + rowstride = gdk_pixbuf_get_rowstride (pixbuf); + + if (count > width) + count = width; + if (count > height) + count = height; + + if (count > 2) + tmp = meta_gradient_create_multi_horizontal (2*width-1, 1, colors, count); + else + /* wrlib multiplies these colors by 256 before passing them in, but + * I think it's a bug in wrlib, so changed here. I could be wrong + * though, if we notice two-color multi diagonals not working. + */ + tmp = meta_gradient_create_horizontal (2*width-1, 1, + &colors[0], &colors[1]); + + if (!tmp) + { + g_object_unref (G_OBJECT (pixbuf)); + return NULL; + } + ptr = gdk_pixbuf_get_pixels (tmp); + + a = ((float)(width - 1))/((float)(height - 1)); + width = width * 3; + + /* copy the first line to the other lines with corresponding offset */ + for (j=0, offset=0; j 0); + + if (n_alphas == 1) + { + /* Optimize this */ + simple_multiply_alpha (pixbuf, alphas[0]); + return; + } + + width = gdk_pixbuf_get_width (pixbuf); + height = gdk_pixbuf_get_height (pixbuf); + + gradient = g_new (unsigned char, width); + gradient_end = gradient + width; + + if (n_alphas > width) + n_alphas = width; + + if (n_alphas > 1) + width2 = width / (n_alphas - 1); + else + width2 = width; + + a = alphas[0] << 8; + gradient_p = gradient; + + /* render the gradient into an array */ + for (i = 1; i < n_alphas; i++) + { + da = (((int)(alphas[i] - (int) alphas[i-1])) << 8) / (int) width2; + + for (j = 0; j < width2; j++) + { + *gradient_p++ = (a >> 8); + + a += da; + } + + a = alphas[i] << 8; + } + + /* get leftover pixels */ + while (gradient_p != gradient_end) + { + *gradient_p++ = a >> 8; + } + + /* Now for each line of the pixbuf, fill in with the gradient */ + pixels = gdk_pixbuf_get_pixels (pixbuf); + rowstride = gdk_pixbuf_get_rowstride (pixbuf); + + p = pixels; + i = 0; + while (i < height) + { + unsigned char *row_end = p + rowstride; + gradient_p = gradient; + + p += 3; + while (gradient_p != gradient_end) + { + /* multiply the two alpha channels. not sure this is right. + * but some end cases are that if the pixbuf contains 255, + * then it should be modified to contain "alpha"; if the + * pixbuf contains 0, it should remain 0. + */ + /* ((*p / 255.0) * (alpha / 255.0)) * 255; */ + *p = (guchar) (((int) *p * (int) *gradient_p) / (int) 255); + + p += 4; + ++gradient_p; + } + + p = row_end; + ++i; + } + + g_free (gradient); +} + +void +meta_gradient_add_alpha (GdkPixbuf *pixbuf, + const guchar *alphas, + int n_alphas, + MetaGradientType type) +{ + g_return_if_fail (GDK_IS_PIXBUF (pixbuf)); + g_return_if_fail (gdk_pixbuf_get_has_alpha (pixbuf)); + g_return_if_fail (n_alphas > 0); + + switch (type) + { + case META_GRADIENT_HORIZONTAL: + meta_gradient_add_alpha_horizontal (pixbuf, alphas, n_alphas); + break; + + case META_GRADIENT_VERTICAL: + g_printerr ("marco: vertical alpha channel gradient not implemented yet\n"); + break; + + case META_GRADIENT_DIAGONAL: + g_printerr ("marco: diagonal alpha channel gradient not implemented yet\n"); + break; + + case META_GRADIENT_LAST: + g_assert_not_reached (); + break; + } +} -- cgit v1.2.1