forked from AuroraMiddleware/gtk
6b9f907270
2000-10-05 Havoc Pennington <hp@redhat.com>
Pixbuf saving, patch from David Welton.
* Makefile.am (GDK_PIXBUF_LIBS): add INTLLIBS
(libgdk_pixbuf_1_3_la_SOURCES): add gdk-pixbuf-i18n.h
* gdk-pixbuf-i18n.h: Add _() to gdk-pixbuf
* io-png.c (gdk_pixbuf__png_image_save): PNG save routine.
* io-jpeg.c (gdk_pixbuf__jpeg_image_save): JPEG save routine.
* gdk-pixbuf-io.c (gdk_pixbuf_save):
(gdk_pixbuf_savev): Implement pixbuf saving routines
* gdk-pixbuf.c (gdk_pixbuf_error_quark): pixbuf error quark
function
* gdk-pixbuf.h: Add public save routines; add pixbuf error
types
* gdk-pixbuf-io.h: Add save function to GdkPixbufModule
2000-10-05 Havoc Pennington <hp@redhat.com>
* demos/testpixbuf-save.c: add pixbuf save test
* demos/Makefile.am: add testpixbuf-save.c
649 lines
20 KiB
C
649 lines
20 KiB
C
/* GdkPixbuf library - PNG image loader
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*
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* Copyright (C) 1999 Mark Crichton
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Authors: Mark Crichton <crichton@gimp.org>
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* Federico Mena-Quintero <federico@gimp.org>
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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 <stdio.h>
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#include <stdlib.h>
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#include <png.h>
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#include "gdk-pixbuf-private.h"
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#include "gdk-pixbuf-io.h"
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static void
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setup_png_transformations(png_structp png_read_ptr, png_infop png_info_ptr,
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gboolean *fatal_error_occurred,
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png_uint_32* width_p, png_uint_32* height_p,
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int* color_type_p)
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{
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png_uint_32 width, height;
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int bit_depth, color_type, interlace_type, compression_type, filter_type;
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int channels;
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/* Get the image info */
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png_get_IHDR (png_read_ptr, png_info_ptr,
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&width, &height,
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&bit_depth,
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&color_type,
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&interlace_type,
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&compression_type,
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&filter_type);
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/* set_expand() basically needs to be called unless
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we are already in RGB/RGBA mode
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*/
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if (color_type == PNG_COLOR_TYPE_PALETTE &&
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bit_depth <= 8) {
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/* Convert indexed images to RGB */
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png_set_expand (png_read_ptr);
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} else if (color_type == PNG_COLOR_TYPE_GRAY &&
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bit_depth < 8) {
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/* Convert grayscale to RGB */
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png_set_expand (png_read_ptr);
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} else if (png_get_valid (png_read_ptr,
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png_info_ptr, PNG_INFO_tRNS)) {
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/* If we have transparency header, convert it to alpha
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channel */
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png_set_expand(png_read_ptr);
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} else if (bit_depth < 8) {
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/* If we have < 8 scale it up to 8 */
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png_set_expand(png_read_ptr);
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/* Conceivably, png_set_packing() is a better idea;
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* God only knows how libpng works
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*/
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}
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/* If we are 16-bit, convert to 8-bit */
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if (bit_depth == 16) {
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png_set_strip_16(png_read_ptr);
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}
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/* If gray scale, convert to RGB */
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if (color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
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png_set_gray_to_rgb(png_read_ptr);
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}
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/* If interlaced, handle that */
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if (interlace_type != PNG_INTERLACE_NONE) {
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png_set_interlace_handling(png_read_ptr);
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}
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/* Update the info the reflect our transformations */
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png_read_update_info(png_read_ptr, png_info_ptr);
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png_get_IHDR (png_read_ptr, png_info_ptr,
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&width, &height,
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&bit_depth,
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&color_type,
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&interlace_type,
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&compression_type,
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&filter_type);
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*width_p = width;
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*height_p = height;
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*color_type_p = color_type;
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#ifndef G_DISABLE_CHECKS
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/* Check that the new info is what we want */
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if (bit_depth != 8) {
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g_warning("Bits per channel of transformed PNG is %d, not 8.", bit_depth);
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*fatal_error_occurred = TRUE;
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return;
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}
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if ( ! (color_type == PNG_COLOR_TYPE_RGB ||
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color_type == PNG_COLOR_TYPE_RGB_ALPHA) ) {
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g_warning("Transformed PNG not RGB or RGBA.");
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*fatal_error_occurred = TRUE;
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return;
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}
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channels = png_get_channels(png_read_ptr, png_info_ptr);
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if ( ! (channels == 3 || channels == 4) ) {
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g_warning("Transformed PNG has %d channels, must be 3 or 4.", channels);
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*fatal_error_occurred = TRUE;
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return;
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}
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#endif
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}
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/* Destroy notification function for the pixbuf */
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static void
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free_buffer (guchar *pixels, gpointer data)
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{
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free (pixels);
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}
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/* Shared library entry point */
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GdkPixbuf *
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gdk_pixbuf__png_image_load (FILE *f)
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{
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png_structp png_ptr;
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png_infop info_ptr, end_info;
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gboolean failed = FALSE;
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gint i, ctype, bpp;
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png_uint_32 w, h;
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png_bytepp rows;
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guchar *pixels;
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png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr)
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return NULL;
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info_ptr = png_create_info_struct (png_ptr);
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if (!info_ptr) {
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png_destroy_read_struct (&png_ptr, NULL, NULL);
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return NULL;
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}
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end_info = png_create_info_struct (png_ptr);
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if (!end_info) {
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png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
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return NULL;
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}
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if (setjmp (png_ptr->jmpbuf)) {
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png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
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return NULL;
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}
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png_init_io (png_ptr, f);
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png_read_info (png_ptr, info_ptr);
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setup_png_transformations(png_ptr, info_ptr, &failed, &w, &h, &ctype);
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if (failed) {
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png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
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return NULL;
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}
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if (ctype & PNG_COLOR_MASK_ALPHA)
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bpp = 4;
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else
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bpp = 3;
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pixels = malloc (w * h * bpp);
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if (!pixels) {
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png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
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return NULL;
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}
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rows = g_new (png_bytep, h);
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for (i = 0; i < h; i++)
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rows[i] = pixels + i * w * bpp;
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png_read_image (png_ptr, rows);
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png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
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g_free (rows);
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if (ctype & PNG_COLOR_MASK_ALPHA)
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return gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, TRUE, 8,
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w, h, w * 4,
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free_buffer, NULL);
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else
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return gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, FALSE, 8,
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w, h, w * 3,
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free_buffer, NULL);
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}
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/* I wish these avoided the setjmp()/longjmp() crap in libpng instead
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just allow you to change the error reporting. */
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static void png_error_callback (png_structp png_read_ptr,
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png_const_charp error_msg);
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static void png_warning_callback(png_structp png_read_ptr,
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png_const_charp warning_msg);
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/* Called at the start of the progressive load */
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static void png_info_callback (png_structp png_read_ptr,
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png_infop png_info_ptr);
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/* Called for each row; note that you will get duplicate row numbers
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for interlaced PNGs */
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static void png_row_callback (png_structp png_read_ptr,
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png_bytep new_row,
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png_uint_32 row_num,
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int pass_num);
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/* Called after reading the entire image */
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static void png_end_callback (png_structp png_read_ptr,
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png_infop png_info_ptr);
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typedef struct _LoadContext LoadContext;
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struct _LoadContext {
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png_structp png_read_ptr;
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png_infop png_info_ptr;
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ModulePreparedNotifyFunc prepare_func;
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ModuleUpdatedNotifyFunc update_func;
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gpointer notify_user_data;
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GdkPixbuf* pixbuf;
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/* row number of first row seen, or -1 if none yet seen */
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gint first_row_seen_in_chunk;
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/* pass number for the first row seen */
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gint first_pass_seen_in_chunk;
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/* row number of last row seen */
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gint last_row_seen_in_chunk;
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gint last_pass_seen_in_chunk;
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/* highest row number seen */
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gint max_row_seen_in_chunk;
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guint fatal_error_occurred : 1;
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};
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gpointer
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gdk_pixbuf__png_image_begin_load (ModulePreparedNotifyFunc prepare_func,
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ModuleUpdatedNotifyFunc update_func,
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ModuleFrameDoneNotifyFunc frame_done_func,
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ModuleAnimationDoneNotifyFunc anim_done_func,
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gpointer user_data)
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{
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LoadContext* lc;
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lc = g_new0(LoadContext, 1);
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lc->fatal_error_occurred = FALSE;
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lc->prepare_func = prepare_func;
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lc->update_func = update_func;
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lc->notify_user_data = user_data;
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lc->first_row_seen_in_chunk = -1;
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lc->last_row_seen_in_chunk = -1;
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lc->first_pass_seen_in_chunk = -1;
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lc->last_pass_seen_in_chunk = -1;
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lc->max_row_seen_in_chunk = -1;
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/* Create the main PNG context struct */
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lc->png_read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
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lc, /* error/warning callback data */
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png_error_callback,
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png_warning_callback);
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if (lc->png_read_ptr == NULL) {
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g_free(lc);
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return NULL;
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}
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if (setjmp (lc->png_read_ptr->jmpbuf)) {
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if (lc->png_info_ptr)
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png_destroy_read_struct(&lc->png_read_ptr, NULL, NULL);
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g_free(lc);
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return NULL;
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}
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/* Create the auxiliary context struct */
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lc->png_info_ptr = png_create_info_struct(lc->png_read_ptr);
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if (lc->png_info_ptr == NULL) {
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png_destroy_read_struct(&lc->png_read_ptr, NULL, NULL);
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g_free(lc);
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return NULL;
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}
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png_set_progressive_read_fn(lc->png_read_ptr,
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lc, /* callback data */
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png_info_callback,
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png_row_callback,
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png_end_callback);
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return lc;
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}
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void
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gdk_pixbuf__png_image_stop_load (gpointer context)
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{
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LoadContext* lc = context;
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g_return_if_fail(lc != NULL);
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gdk_pixbuf_unref(lc->pixbuf);
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png_destroy_read_struct(&lc->png_read_ptr, NULL, NULL);
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g_free(lc);
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}
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gboolean
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gdk_pixbuf__png_image_load_increment(gpointer context, guchar *buf, guint size)
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{
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LoadContext* lc = context;
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g_return_val_if_fail(lc != NULL, FALSE);
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/* reset */
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lc->first_row_seen_in_chunk = -1;
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lc->last_row_seen_in_chunk = -1;
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lc->first_pass_seen_in_chunk = -1;
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lc->last_pass_seen_in_chunk = -1;
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lc->max_row_seen_in_chunk = -1;
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/* Invokes our callbacks as needed */
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if (setjmp (lc->png_read_ptr->jmpbuf)) {
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return FALSE;
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} else {
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png_process_data(lc->png_read_ptr, lc->png_info_ptr, buf, size);
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}
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if (lc->fatal_error_occurred)
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return FALSE;
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else {
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if (lc->first_row_seen_in_chunk >= 0) {
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/* We saw at least one row */
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gint pass_diff = lc->last_pass_seen_in_chunk - lc->first_pass_seen_in_chunk;
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g_assert(pass_diff >= 0);
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if (pass_diff == 0) {
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/* start and end row were in the same pass */
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(lc->update_func)(lc->pixbuf, 0,
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lc->first_row_seen_in_chunk,
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lc->pixbuf->width,
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(lc->last_row_seen_in_chunk -
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lc->first_row_seen_in_chunk) + 1,
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lc->notify_user_data);
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} else if (pass_diff == 1) {
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/* We have from the first row seen to
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the end of the image (max row
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seen), then from the top of the
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image to the last row seen */
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/* first row to end */
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(lc->update_func)(lc->pixbuf, 0,
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lc->first_row_seen_in_chunk,
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lc->pixbuf->width,
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(lc->max_row_seen_in_chunk -
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lc->first_row_seen_in_chunk) + 1,
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lc->notify_user_data);
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/* top to last row */
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(lc->update_func)(lc->pixbuf,
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0, 0,
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lc->pixbuf->width,
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lc->last_row_seen_in_chunk + 1,
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lc->notify_user_data);
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} else {
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/* We made at least one entire pass, so update the
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whole image */
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(lc->update_func)(lc->pixbuf,
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0, 0,
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lc->pixbuf->width,
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lc->max_row_seen_in_chunk + 1,
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lc->notify_user_data);
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}
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}
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return TRUE;
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}
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}
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/* Called at the start of the progressive load, once we have image info */
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static void
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png_info_callback (png_structp png_read_ptr,
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png_infop png_info_ptr)
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{
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LoadContext* lc;
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png_uint_32 width, height;
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int color_type;
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gboolean have_alpha = FALSE;
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gboolean failed = FALSE;
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lc = png_get_progressive_ptr(png_read_ptr);
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if (lc->fatal_error_occurred)
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return;
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setup_png_transformations(lc->png_read_ptr,
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lc->png_info_ptr,
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&failed,
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&width, &height, &color_type);
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if (failed) {
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lc->fatal_error_occurred = TRUE;
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return;
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}
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/* If we have alpha, set a flag */
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if (color_type & PNG_COLOR_MASK_ALPHA)
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have_alpha = TRUE;
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lc->pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, have_alpha, 8, width, height);
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if (lc->pixbuf == NULL) {
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/* Failed to allocate memory */
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lc->fatal_error_occurred = TRUE;
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return;
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}
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/* Notify the client that we are ready to go */
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if (lc->prepare_func)
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(* lc->prepare_func) (lc->pixbuf, lc->notify_user_data);
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return;
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}
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/* Called for each row; note that you will get duplicate row numbers
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for interlaced PNGs */
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static void
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png_row_callback (png_structp png_read_ptr,
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png_bytep new_row,
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png_uint_32 row_num,
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int pass_num)
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{
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LoadContext* lc;
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guchar* old_row = NULL;
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lc = png_get_progressive_ptr(png_read_ptr);
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if (lc->fatal_error_occurred)
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return;
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if (lc->first_row_seen_in_chunk < 0) {
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lc->first_row_seen_in_chunk = row_num;
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lc->first_pass_seen_in_chunk = pass_num;
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}
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lc->max_row_seen_in_chunk = MAX(lc->max_row_seen_in_chunk, ((gint)row_num));
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lc->last_row_seen_in_chunk = row_num;
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lc->last_pass_seen_in_chunk = pass_num;
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old_row = lc->pixbuf->pixels + (row_num * lc->pixbuf->rowstride);
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png_progressive_combine_row(lc->png_read_ptr, old_row, new_row);
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}
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/* Called after reading the entire image */
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static void
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png_end_callback (png_structp png_read_ptr,
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png_infop png_info_ptr)
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{
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LoadContext* lc;
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lc = png_get_progressive_ptr(png_read_ptr);
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if (lc->fatal_error_occurred)
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return;
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}
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static void
|
||
png_error_callback(png_structp png_read_ptr,
|
||
png_const_charp error_msg)
|
||
{
|
||
LoadContext* lc;
|
||
|
||
lc = png_get_error_ptr(png_read_ptr);
|
||
|
||
lc->fatal_error_occurred = TRUE;
|
||
|
||
fprintf(stderr, "Fatal error loading PNG: %s\n", error_msg);
|
||
}
|
||
|
||
static void
|
||
png_warning_callback(png_structp png_read_ptr,
|
||
png_const_charp warning_msg)
|
||
{
|
||
LoadContext* lc;
|
||
|
||
lc = png_get_error_ptr(png_read_ptr);
|
||
|
||
fprintf(stderr, "Warning loading PNG: %s\n", warning_msg);
|
||
}
|
||
|
||
|
||
/* Save */
|
||
gboolean
|
||
gdk_pixbuf__png_image_save (FILE *f,
|
||
GdkPixbuf *pixbuf,
|
||
gchar **keys,
|
||
gchar **values,
|
||
GError **error)
|
||
{
|
||
/* FIXME error handling is broken */
|
||
|
||
png_structp png_ptr;
|
||
png_infop info_ptr;
|
||
guchar *ptr;
|
||
guchar *pixels;
|
||
int x, y, j;
|
||
png_bytep row_ptr, data = NULL;
|
||
png_color_8 sig_bit;
|
||
int w, h, rowstride;
|
||
int has_alpha;
|
||
int bpc;
|
||
|
||
if (keys && *keys) {
|
||
g_warning ("Bad option name '%s' passed to PNG saver",
|
||
*keys);
|
||
return FALSE;
|
||
#if 0
|
||
gchar **kiter = keys;
|
||
gchar **viter = values;
|
||
|
||
|
||
while (*kiter) {
|
||
|
||
++kiter;
|
||
++viter;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
bpc = gdk_pixbuf_get_bits_per_sample (pixbuf);
|
||
w = gdk_pixbuf_get_width (pixbuf);
|
||
h = gdk_pixbuf_get_height (pixbuf);
|
||
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
|
||
has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
|
||
pixels = gdk_pixbuf_get_pixels (pixbuf);
|
||
|
||
png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
|
||
NULL, NULL, NULL);
|
||
|
||
g_return_val_if_fail (png_ptr != NULL, FALSE);
|
||
|
||
info_ptr = png_create_info_struct (png_ptr);
|
||
if (info_ptr == NULL) {
|
||
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
|
||
return FALSE;
|
||
}
|
||
if (setjmp (png_ptr->jmpbuf)) {
|
||
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
|
||
return FALSE;
|
||
}
|
||
png_init_io (png_ptr, f);
|
||
if (has_alpha) {
|
||
png_set_IHDR (png_ptr, info_ptr, w, h, bpc,
|
||
PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
|
||
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
|
||
#ifdef WORDS_BIGENDIAN
|
||
png_set_swap_alpha (png_ptr);
|
||
#else
|
||
png_set_bgr (png_ptr);
|
||
#endif
|
||
} else {
|
||
png_set_IHDR (png_ptr, info_ptr, w, h, bpc,
|
||
PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
|
||
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
|
||
data = malloc (w * 3 * sizeof (char));
|
||
}
|
||
sig_bit.red = bpc;
|
||
sig_bit.green = bpc;
|
||
sig_bit.blue = bpc;
|
||
sig_bit.alpha = bpc;
|
||
png_set_sBIT (png_ptr, info_ptr, &sig_bit);
|
||
png_write_info (png_ptr, info_ptr);
|
||
png_set_shift (png_ptr, &sig_bit);
|
||
png_set_packing (png_ptr);
|
||
|
||
ptr = pixels;
|
||
for (y = 0; y < h; y++) {
|
||
if (has_alpha)
|
||
row_ptr = (png_bytep)ptr;
|
||
else {
|
||
for (j = 0, x = 0; x < w; x++)
|
||
memcpy (&(data[x*3]), &(ptr[x*3]), 3);
|
||
|
||
row_ptr = (png_bytep)data;
|
||
}
|
||
png_write_rows (png_ptr, &row_ptr, 1);
|
||
ptr += rowstride;
|
||
}
|
||
|
||
if (data)
|
||
free (data);
|
||
|
||
png_write_end (png_ptr, info_ptr);
|
||
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
|