/* GdkPixbuf library - Scaling and compositing functions * * Copyright (C) 1999 The Free Software Foundation * * Author: Owen Taylor * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser 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 #include #include "gdk-pixbuf-private.h" #include "pixops/pixops.h" #include "gdk-pixbuf-alias.h" /** * gdk_pixbuf_scale: * @src: a #GdkPixbuf * @dest: the #GdkPixbuf into which to render the results * @dest_x: the left coordinate for region to render * @dest_y: the top coordinate for region to render * @dest_width: the width of the region to render * @dest_height: the height of the region to render * @offset_x: the offset in the X direction (currently rounded to an integer) * @offset_y: the offset in the Y direction (currently rounded to an integer) * @scale_x: the scale factor in the X direction * @scale_y: the scale factor in the Y direction * @interp_type: the interpolation type for the transformation. * * Creates a transformation of the source image @src by scaling by * @scale_x and @scale_y then translating by @offset_x and @offset_y, * then renders the rectangle (@dest_x, @dest_y, @dest_width, * @dest_height) of the resulting image onto the destination image * replacing the previous contents. * * Try to use gdk_pixbuf_scale_simple() first, this function is * the industrial-strength power tool you can fall back to if * gdk_pixbuf_scale_simple() isn't powerful enough. * * If the source rectangle overlaps the destination rectangle on the * same pixbuf, it will be overwritten during the scaling which * results in rendering artifacts. **/ void gdk_pixbuf_scale (const GdkPixbuf *src, GdkPixbuf *dest, int dest_x, int dest_y, int dest_width, int dest_height, double offset_x, double offset_y, double scale_x, double scale_y, GdkInterpType interp_type) { g_return_if_fail (GDK_IS_PIXBUF (src)); g_return_if_fail (GDK_IS_PIXBUF (dest)); g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width); g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height); offset_x = floor (offset_x + 0.5); offset_y = floor (offset_y + 0.5); _pixops_scale (dest->pixels, dest->width, dest->height, dest->rowstride, dest->n_channels, dest->has_alpha, src->pixels, src->width, src->height, src->rowstride, src->n_channels, src->has_alpha, dest_x, dest_y, dest_width, dest_height, offset_x, offset_y, scale_x, scale_y, (PixopsInterpType)interp_type); } /** * gdk_pixbuf_composite: * @src: a #GdkPixbuf * @dest: the #GdkPixbuf into which to render the results * @dest_x: the left coordinate for region to render * @dest_y: the top coordinate for region to render * @dest_width: the width of the region to render * @dest_height: the height of the region to render * @offset_x: the offset in the X direction (currently rounded to an integer) * @offset_y: the offset in the Y direction (currently rounded to an integer) * @scale_x: the scale factor in the X direction * @scale_y: the scale factor in the Y direction * @interp_type: the interpolation type for the transformation. * @overall_alpha: overall alpha for source image (0..255) * * Creates a transformation of the source image @src by scaling by * @scale_x and @scale_y then translating by @offset_x and @offset_y. * This gives an image in the coordinates of the destination pixbuf. * The rectangle (@dest_x, @dest_y, @dest_width, @dest_height) * is then composited onto the corresponding rectangle of the * original destination image. * * When the destination rectangle contains parts not in the source * image, the data at the edges of the source image is replicated * to infinity. * *
* Compositing of pixbufs * *
**/ void gdk_pixbuf_composite (const GdkPixbuf *src, GdkPixbuf *dest, int dest_x, int dest_y, int dest_width, int dest_height, double offset_x, double offset_y, double scale_x, double scale_y, GdkInterpType interp_type, int overall_alpha) { g_return_if_fail (GDK_IS_PIXBUF (src)); g_return_if_fail (GDK_IS_PIXBUF (dest)); g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width); g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height); g_return_if_fail (overall_alpha >= 0 && overall_alpha <= 255); offset_x = floor (offset_x + 0.5); offset_y = floor (offset_y + 0.5); _pixops_composite (dest->pixels, dest->width, dest->height, dest->rowstride, dest->n_channels, dest->has_alpha, src->pixels, src->width, src->height, src->rowstride, src->n_channels, src->has_alpha, dest_x, dest_y, dest_width, dest_height, offset_x, offset_y, scale_x, scale_y, (PixopsInterpType)interp_type, overall_alpha); } /** * gdk_pixbuf_composite_color: * @src: a #GdkPixbuf * @dest: the #GdkPixbuf into which to render the results * @dest_x: the left coordinate for region to render * @dest_y: the top coordinate for region to render * @dest_width: the width of the region to render * @dest_height: the height of the region to render * @offset_x: the offset in the X direction (currently rounded to an integer) * @offset_y: the offset in the Y direction (currently rounded to an integer) * @scale_x: the scale factor in the X direction * @scale_y: the scale factor in the Y direction * @interp_type: the interpolation type for the transformation. * @overall_alpha: overall alpha for source image (0..255) * @check_x: the X offset for the checkboard (origin of checkboard is at -@check_x, -@check_y) * @check_y: the Y offset for the checkboard * @check_size: the size of checks in the checkboard (must be a power of two) * @color1: the color of check at upper left * @color2: the color of the other check * * Creates a transformation of the source image @src by scaling by * @scale_x and @scale_y then translating by @offset_x and @offset_y, * then composites the rectangle (@dest_x ,@dest_y, @dest_width, * @dest_height) of the resulting image with a checkboard of the * colors @color1 and @color2 and renders it onto the destination * image. * * See gdk_pixbuf_composite_color_simple() for a simpler variant of this * function suitable for many tasks. * **/ void gdk_pixbuf_composite_color (const GdkPixbuf *src, GdkPixbuf *dest, int dest_x, int dest_y, int dest_width, int dest_height, double offset_x, double offset_y, double scale_x, double scale_y, GdkInterpType interp_type, int overall_alpha, int check_x, int check_y, int check_size, guint32 color1, guint32 color2) { g_return_if_fail (GDK_IS_PIXBUF (src)); g_return_if_fail (GDK_IS_PIXBUF (dest)); g_return_if_fail (dest_x >= 0 && dest_x + dest_width <= dest->width); g_return_if_fail (dest_y >= 0 && dest_y + dest_height <= dest->height); g_return_if_fail (overall_alpha >= 0 && overall_alpha <= 255); offset_x = floor (offset_x + 0.5); offset_y = floor (offset_y + 0.5); _pixops_composite_color (dest->pixels, dest_width, dest_height, dest->rowstride, dest->n_channels, dest->has_alpha, src->pixels, src->width, src->height, src->rowstride, src->n_channels, src->has_alpha, dest_x, dest_y, dest_width, dest_height, offset_x, offset_y, scale_x, scale_y, (PixopsInterpType)interp_type, overall_alpha, check_x, check_y, check_size, color1, color2); } /** * gdk_pixbuf_scale_simple: * @src: a #GdkPixbuf * @dest_width: the width of destination image * @dest_height: the height of destination image * @interp_type: the interpolation type for the transformation. * * Create a new #GdkPixbuf containing a copy of @src scaled to * @dest_width x @dest_height. Leaves @src unaffected. @interp_type * should be #GDK_INTERP_NEAREST if you want maximum speed (but when * scaling down #GDK_INTERP_NEAREST is usually unusably ugly). The * default @interp_type should be #GDK_INTERP_BILINEAR which offers * reasonable quality and speed. * * You can scale a sub-portion of @src by creating a sub-pixbuf * pointing into @src; see gdk_pixbuf_new_subpixbuf(). * * For more complicated scaling/compositing see gdk_pixbuf_scale() * and gdk_pixbuf_composite(). * * Return value: the new #GdkPixbuf, or %NULL if not enough memory could be * allocated for it. **/ GdkPixbuf * gdk_pixbuf_scale_simple (const GdkPixbuf *src, int dest_width, int dest_height, GdkInterpType interp_type) { GdkPixbuf *dest; g_return_val_if_fail (GDK_IS_PIXBUF (src), NULL); g_return_val_if_fail (dest_width > 0, NULL); g_return_val_if_fail (dest_height > 0, NULL); dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, src->has_alpha, 8, dest_width, dest_height); if (!dest) return NULL; gdk_pixbuf_scale (src, dest, 0, 0, dest_width, dest_height, 0, 0, (double) dest_width / src->width, (double) dest_height / src->height, interp_type); return dest; } /** * gdk_pixbuf_composite_color_simple: * @src: a #GdkPixbuf * @dest_width: the width of destination image * @dest_height: the height of destination image * @interp_type: the interpolation type for the transformation. * @overall_alpha: overall alpha for source image (0..255) * @check_size: the size of checks in the checkboard (must be a power of two) * @color1: the color of check at upper left * @color2: the color of the other check * * Creates a new #GdkPixbuf by scaling @src to @dest_width x * @dest_height and compositing the result with a checkboard of colors * @color1 and @color2. * * Return value: the new #GdkPixbuf, or %NULL if not enough memory could be * allocated for it. **/ GdkPixbuf * gdk_pixbuf_composite_color_simple (const GdkPixbuf *src, int dest_width, int dest_height, GdkInterpType interp_type, int overall_alpha, int check_size, guint32 color1, guint32 color2) { GdkPixbuf *dest; g_return_val_if_fail (GDK_IS_PIXBUF (src), NULL); g_return_val_if_fail (dest_width > 0, NULL); g_return_val_if_fail (dest_height > 0, NULL); g_return_val_if_fail (overall_alpha >= 0 && overall_alpha <= 255, NULL); dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, src->has_alpha, 8, dest_width, dest_height); if (!dest) return NULL; gdk_pixbuf_composite_color (src, dest, 0, 0, dest_width, dest_height, 0, 0, (double) dest_width / src->width, (double) dest_height / src->height, interp_type, overall_alpha, 0, 0, check_size, color1, color2); return dest; } #define OFFSET(pb, x, y) ((x) * (pb)->n_channels + (y) * (pb)->rowstride) /** * gdk_pixbuf_rotate_simple: * @src: a #GdkPixbuf * @angle: the angle to rotate by * * Rotates a pixbuf by a multiple of 90 degrees, and returns the * result in a new pixbuf. * * Returns: the new #GdkPixbuf, or %NULL if not enough memory could be * allocated for it. * * Since: 2.6 */ GdkPixbuf * gdk_pixbuf_rotate_simple (const GdkPixbuf *src, GdkPixbufRotation angle) { GdkPixbuf *dest; guchar *p, *q; gint x, y; switch (angle % 360) { case 0: dest = gdk_pixbuf_copy (src); break; case 90: dest = gdk_pixbuf_new (src->colorspace, src->has_alpha, src->bits_per_sample, src->height, src->width); if (!dest) return NULL; for (y = 0; y < src->height; y++) { for (x = 0; x < src->width; x++) { p = src->pixels + OFFSET (src, x, y); q = dest->pixels + OFFSET (dest, y, src->width - x - 1); memcpy (q, p, dest->n_channels); } } break; case 180: dest = gdk_pixbuf_new (src->colorspace, src->has_alpha, src->bits_per_sample, src->width, src->height); if (!dest) return NULL; for (y = 0; y < src->height; y++) { for (x = 0; x < src->width; x++) { p = src->pixels + OFFSET (src, x, y); q = dest->pixels + OFFSET (dest, src->width - x - 1, src->height - y - 1); memcpy (q, p, dest->n_channels); } } break; case 270: dest = gdk_pixbuf_new (src->colorspace, src->has_alpha, src->bits_per_sample, src->height, src->width); if (!dest) return NULL; for (y = 0; y < src->height; y++) { for (x = 0; x < src->width; x++) { p = src->pixels + OFFSET (src, x, y); q = dest->pixels + OFFSET (dest, src->height - y - 1, x); memcpy (q, p, dest->n_channels); } } break; default: dest = NULL; g_warning ("gdk_pixbuf_rotate_simple() can only rotate " "by multiples of 90 degrees"); g_assert_not_reached (); } return dest; } /** * gdk_pixbuf_flip: * @src: a #GdkPixbuf * @horizontal: %TRUE to flip horizontally, %FALSE to flip vertically * * Flips a pixbuf horizontally or vertically and returns the * result in a new pixbuf. * * Returns: the new #GdkPixbuf, or %NULL if not enough memory could be * allocated for it. * * Since: 2.6 */ GdkPixbuf * gdk_pixbuf_flip (const GdkPixbuf *src, gboolean horizontal) { GdkPixbuf *dest; guchar *p, *q; gint x, y; dest = gdk_pixbuf_new (src->colorspace, src->has_alpha, src->bits_per_sample, src->width, src->height); if (!dest) return NULL; if (!horizontal) /* flip vertical */ { for (y = 0; y < dest->height; y++) { p = src->pixels + OFFSET (src, 0, y); q = dest->pixels + OFFSET (dest, 0, dest->height - y - 1); memcpy (q, p, dest->rowstride); } } else /* flip horizontal */ { for (y = 0; y < dest->height; y++) { for (x = 0; x < dest->width; x++) { p = src->pixels + OFFSET (src, x, y); q = dest->pixels + OFFSET (dest, dest->width - x - 1, y); memcpy (q, p, dest->n_channels); } } } return dest; } #define __GDK_PIXBUF_SCALE_C__ #include "gdk-pixbuf-aliasdef.c"