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9d8e5e0ba8
2001-11-03 Sebastian Wilhelmi <wilhelmi@ira.uka.de> * gdk-pixbuf/tmpl/refcounting.sgml, gdk-pixbuf/porting-from-imlib.sgml, tmpl/creating.sgml: gdk_rgb_init() doesn't need to be called anymore. Use g_object_(un)_ref instead of gdk_pixbuf_(un)ref. * tmpl/module_interface.sgml: Typo fix. * gdk-pixbuf/gdk-pixbuf.sgml: Fixed jade complaining about '_' by replacing it with '-'. Now builds again. * gdk-pixbuf-loader.c, gdk-pixbuf-scale.c: Documentation fixes.
278 lines
10 KiB
C
278 lines
10 KiB
C
/* GdkPixbuf library - Scaling and compositing functions
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*
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Author: Owen Taylor <otaylor@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <math.h>
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#include "gdk-pixbuf-private.h"
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#include "pixops/pixops.h"
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/**
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* gdk_pixbuf_scale:
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* @src: a #GdkPixbuf
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* @dest: the #GdkPixbuf into which to render the results
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* @dest_x: the left coordinate for region to render
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* @dest_y: the top coordinate for region to render
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* @dest_width: the width of the region to render
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* @dest_height: the height of the region to render
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* @offset_x: the offset in the X direction (currently rounded to an integer)
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* @offset_y: the offset in the Y direction (currently rounded to an integer)
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* @scale_x: the scale factor in the X direction
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* @scale_y: the scale factor in the Y direction
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* @interp_type: the interpolation type for the transformation.
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*
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* Transforms the source image @src by scaling by @scale_x and
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* @scale_y then translating by @offset_x and @offset_y, then renders
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* the rectangle (@dest_x, @dest_y, @dest_width, @dest_height) of the
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* resulting image onto the destination image replacing the
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* previous contents.
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**/
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void
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gdk_pixbuf_scale (const GdkPixbuf *src,
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GdkPixbuf *dest,
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int dest_x,
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int dest_y,
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int dest_width,
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int dest_height,
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double offset_x,
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double offset_y,
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double scale_x,
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double scale_y,
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GdkInterpType interp_type)
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{
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g_return_if_fail (src != NULL);
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g_return_if_fail (dest != NULL);
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g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width);
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g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height);
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offset_x = floor (offset_x + 0.5);
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offset_y = floor (offset_y + 0.5);
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pixops_scale (dest->pixels + dest_y * dest->rowstride + dest_x * dest->n_channels,
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dest_x - offset_x, dest_y - offset_y,
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dest_x + dest_width - offset_x, dest_y + dest_height - offset_y,
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dest->rowstride, dest->n_channels, dest->has_alpha,
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src->pixels, src->width, src->height,
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src->rowstride, src->n_channels, src->has_alpha,
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scale_x, scale_y, interp_type);
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}
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/**
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* gdk_pixbuf_composite:
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* @src: a #GdkPixbuf
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* @dest: the #GdkPixbuf into which to render the results
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* @dest_x: the left coordinate for region to render
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* @dest_y: the top coordinate for region to render
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* @dest_width: the width of the region to render
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* @dest_height: the height of the region to render
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* @offset_x: the offset in the X direction (currently rounded to an integer)
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* @offset_y: the offset in the Y direction (currently rounded to an integer)
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* @scale_x: the scale factor in the X direction
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* @scale_y: the scale factor in the Y direction
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* @interp_type: the interpolation type for the transformation.
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* @overall_alpha: overall alpha for source image (0..255)
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*
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* Transforms the source image @src by scaling by @scale_x and
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* @scale_y then translating by @offset_x and @offset_y, then
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* composites the rectangle (@dest_x, @dest_y, @dest_width,
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* @dest_height) of the resulting image onto the destination image.
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**/
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void
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gdk_pixbuf_composite (const GdkPixbuf *src,
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GdkPixbuf *dest,
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int dest_x,
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int dest_y,
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int dest_width,
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int dest_height,
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double offset_x,
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double offset_y,
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double scale_x,
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double scale_y,
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GdkInterpType interp_type,
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int overall_alpha)
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{
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g_return_if_fail (src != NULL);
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g_return_if_fail (dest != NULL);
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g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width);
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g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height);
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g_return_if_fail (overall_alpha >= 0 && overall_alpha <= 255);
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offset_x = floor (offset_x + 0.5);
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offset_y = floor (offset_y + 0.5);
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pixops_composite (dest->pixels + dest_y * dest->rowstride + dest_x * dest->n_channels,
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dest_x - offset_x, dest_y - offset_y,
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dest_x + dest_width - offset_x, dest_y + dest_height - offset_y,
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dest->rowstride, dest->n_channels, dest->has_alpha,
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src->pixels, src->width, src->height,
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src->rowstride, src->n_channels, src->has_alpha,
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scale_x, scale_y, interp_type, overall_alpha);
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}
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/**
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* gdk_pixbuf_composite_color:
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* @src: a #GdkPixbuf
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* @dest: the #GdkPixbuf into which to render the results
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* @dest_x: the left coordinate for region to render
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* @dest_y: the top coordinate for region to render
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* @dest_width: the width of the region to render
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* @dest_height: the height of the region to render
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* @offset_x: the offset in the X direction (currently rounded to an integer)
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* @offset_y: the offset in the Y direction (currently rounded to an integer)
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* @scale_x: the scale factor in the X direction
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* @scale_y: the scale factor in the Y direction
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* @interp_type: the interpolation type for the transformation.
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* @overall_alpha: overall alpha for source image (0..255)
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* @check_x: the X offset for the checkboard (origin of checkboard is at -@check_x, -@check_y)
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* @check_y: the Y offset for the checkboard
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* @check_size: the size of checks in the checkboard (must be a power of two)
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* @color1: the color of check at upper left
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* @color2: the color of the other check
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*
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* Transforms the source image @src by scaling by @scale_x and @scale_y then
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* translating by @offset_x and @offset_y, then composites the rectangle
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* (@dest_x ,@dest_y, @dest_width, @dest_height) of the resulting image with
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* a checkboard of the colors @color1 and @color2 and renders it onto the
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* destination image.
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**/
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void
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gdk_pixbuf_composite_color (const GdkPixbuf *src,
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GdkPixbuf *dest,
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int dest_x,
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int dest_y,
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int dest_width,
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int dest_height,
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double offset_x,
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double offset_y,
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double scale_x,
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double scale_y,
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GdkInterpType interp_type,
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int overall_alpha,
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int check_x,
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int check_y,
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int check_size,
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guint32 color1,
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guint32 color2)
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{
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g_return_if_fail (src != NULL);
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g_return_if_fail (dest != NULL);
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g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width);
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g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height);
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g_return_if_fail (overall_alpha >= 0 && overall_alpha <= 255);
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offset_x = floor (offset_x + 0.5);
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offset_y = floor (offset_y + 0.5);
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pixops_composite_color (dest->pixels + dest_y * dest->rowstride + dest_x * dest->n_channels,
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dest_x - offset_x, dest_y - offset_y,
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dest_x + dest_width - offset_x, dest_y + dest_height - offset_y,
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dest->rowstride, dest->n_channels, dest->has_alpha,
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src->pixels, src->width, src->height,
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src->rowstride, src->n_channels, src->has_alpha,
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scale_x, scale_y, interp_type, overall_alpha, check_x, check_y,
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check_size, color1, color2);
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}
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/**
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* gdk_pixbuf_scale_simple:
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* @src: a #GdkPixbuf
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* @dest_width: the width of destination image
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* @dest_height: the height of destination image
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* @interp_type: the interpolation type for the transformation.
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*
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* Scale the #GdkPixbuf @src to @dest_width x @dest_height and render
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* the result into a new #GdkPixbuf.
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*
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* Return value: the new #GdkPixbuf, or NULL if not enough memory could be
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* allocated for it.
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**/
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GdkPixbuf *
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gdk_pixbuf_scale_simple (const GdkPixbuf *src,
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int dest_width,
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int dest_height,
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GdkInterpType interp_type)
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{
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GdkPixbuf *dest;
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g_return_val_if_fail (src != NULL, NULL);
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g_return_val_if_fail (dest_width > 0, NULL);
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g_return_val_if_fail (dest_height > 0, NULL);
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dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, src->has_alpha, 8, dest_width, dest_height);
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if (!dest)
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return NULL;
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gdk_pixbuf_scale (src, dest, 0, 0, dest_width, dest_height, 0, 0,
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(double) dest_width / src->width,
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(double) dest_height / src->height,
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interp_type);
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return dest;
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}
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/**
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* gdk_pixbuf_composite_color_simple:
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* @src: a #GdkPixbuf
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* @dest_width: the width of destination image
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* @dest_height: the height of destination image
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* @interp_type: the interpolation type for the transformation.
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* @overall_alpha: overall alpha for source image (0..255)
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* @check_size: the size of checks in the checkboard (must be a power of two)
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* @color1: the color of check at upper left
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* @color2: the color of the other check
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*
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* Scale the #GdkPixbuf @src to @dest_width x @dest_height composite
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* the result with a checkboard of colors @color1 and @color2 and
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* render the result into a new #GdkPixbuf.
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*
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* Return value: the new #GdkPixbuf, or NULL if not enough memory could be
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* allocated for it.
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**/
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GdkPixbuf *
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gdk_pixbuf_composite_color_simple (const GdkPixbuf *src,
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int dest_width,
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int dest_height,
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GdkInterpType interp_type,
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int overall_alpha,
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int check_size,
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guint32 color1,
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guint32 color2)
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{
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GdkPixbuf *dest;
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g_return_val_if_fail (src != NULL, NULL);
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g_return_val_if_fail (dest_width > 0, NULL);
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g_return_val_if_fail (dest_height > 0, NULL);
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g_return_val_if_fail (overall_alpha >= 0 && overall_alpha <= 255, NULL);
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dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, src->has_alpha, 8, dest_width, dest_height);
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if (!dest)
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return NULL;
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gdk_pixbuf_composite_color (src, dest, 0, 0, dest_width, dest_height, 0, 0,
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(double) dest_width / src->width,
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(double) dest_height / src->height,
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interp_type, overall_alpha, 0, 0, check_size, color1, color2);
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return dest;
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}
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