Initial revision

source/blender/imbuf/intern/png_encode.c

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+/**
+ *
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * 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. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ * $Id$
+ */
+
+
+#include "png.h"
+
+#ifdef WIN32
+#include "BLI_winstuff.h"
+#endif
+#include "BLI_blenlib.h"
+
+#include "imbuf.h"
+#include "imbuf_patch.h"
+
+#include "IMB_imbuf_types.h"
+#include "IMB_imbuf.h"
+
+#include "IMB_allocimbuf.h"
+#include "IMB_cmap.h"
+
+static void
+WriteData(
+    png_structp png_ptr,
+    png_bytep data,
+    png_size_t length);
+
+static void
+Flush(
+    png_structp png_ptr);
+
+static void
+WriteData(
+    png_structp png_ptr,
+    png_bytep data,
+    png_size_t length)
+{
+	ImBuf *ibuf = (ImBuf *) png_get_io_ptr(png_ptr);
+
+	// if buffer is to small increase it.
+	while (ibuf->encodedsize + length > ibuf->encodedbuffersize) {
+		imb_enlargeencodedbufferImBuf(ibuf);
+	}
+
+	memcpy(ibuf->encodedbuffer + ibuf->encodedsize, data, length);
+	ibuf->encodedsize += length;
+}
+
+static void
+Flush(
+    png_structp png_ptr)
+{
+}
+
+short IMB_png_encode(struct ImBuf *ibuf, int file, int flags)
+{
+	png_structp png_ptr;
+	png_infop info_ptr;
+	unsigned char *pixels = 0;
+	unsigned char *from, *to;
+	png_bytepp row_pointers = 0;
+	int i, bytesperpixel, color_type;
+	FILE *fp = 0;
+
+	bytesperpixel = (ibuf->depth + 7) >> 3;
+	if ((bytesperpixel > 4) || (bytesperpixel == 2)) {
+		printf("imb_png_encode: unsupported bytes per pixel: %d\n", bytesperpixel);
+		return (0);
+	}
+
+	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
+		NULL, NULL, NULL);
+	if (png_ptr == NULL) {
+		printf("Cannot png_create_write_struct\n");
+		return 0;
+	}
+
+	info_ptr = png_create_info_struct(png_ptr);
+	if (info_ptr == NULL) {
+		png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+		printf("Cannot png_create_info_struct\n");
+		return 0;
+	}
+
+	if (setjmp(png_jmpbuf(png_ptr))) {
+		png_destroy_write_struct(&png_ptr, &info_ptr);
+		if (pixels) MEM_freeN(pixels);
+		if (row_pointers) MEM_freeN(row_pointers);
+		// printf("Aborting\n");
+		if (fp) {
+			fflush(fp);
+			fclose(fp);
+		}
+		return 0;
+	}
+
+	// copy image data
+
+	pixels = MEM_mallocN(ibuf->x * ibuf->y * bytesperpixel * sizeof(unsigned char), "pixels");
+	if (pixels == NULL) {
+		printf("Cannot allocate pixels array\n");
+		return 0;
+	}
+
+	from = (unsigned char *) ibuf->rect;
+	to = pixels;
+
+	switch (bytesperpixel) {
+	case 4:
+		color_type = PNG_COLOR_TYPE_RGBA;
+		for (i = ibuf->x * ibuf->y; i > 0; i--) {
+			to[0] = from[0];
+			to[1] = from[1];
+			to[2] = from[2];
+			to[3] = from[3];
+			to += 4; from += 4;
+		}
+		break;
+	case 3:
+		color_type = PNG_COLOR_TYPE_RGB;
+		for (i = ibuf->x * ibuf->y; i > 0; i--) {
+			to[0] = from[0];
+			to[1] = from[1];
+			to[2] = from[2];
+			to += 3; from += 4;
+		}
+		break;
+	case 1:
+		color_type = PNG_COLOR_TYPE_GRAY;
+		for (i = ibuf->x * ibuf->y; i > 0; i--) {
+			to[0] = from[0];
+			to++; from += 4;
+		}
+		break;
+	}
+
+	if (flags & IB_mem) {
+		// create image in memory
+		imb_addencodedbufferImBuf(ibuf);
+		ibuf->encodedsize = 0;
+
+		png_set_write_fn(png_ptr,
+			 (png_voidp) ibuf,
+			 WriteData,
+			 Flush);
+	} else {
+		fp = fdopen(file, "wb");
+		png_init_io(png_ptr, fp);
+	}
+
+	/*
+	png_set_filter(png_ptr, 0,
+		PNG_FILTER_NONE  | PNG_FILTER_VALUE_NONE |
+		PNG_FILTER_SUB   | PNG_FILTER_VALUE_SUB  |
+		PNG_FILTER_UP    | PNG_FILTER_VALUE_UP   |
+		PNG_FILTER_AVG   | PNG_FILTER_VALUE_AVG  |
+		PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
+		PNG_ALL_FILTERS);
+
+	png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
+	*/
+
+	// png image settings
+	png_set_IHDR(png_ptr,
+		 info_ptr,
+		 ibuf->x,
+		 ibuf->y,
+		 8,
+		 color_type,
+		 PNG_INTERLACE_NONE,
+		 PNG_COMPRESSION_TYPE_DEFAULT,
+		 PNG_FILTER_TYPE_DEFAULT);
+
+	// write the file header information
+	png_write_info(png_ptr, info_ptr);
+
+	// allocate memory for an array of row-pointers
+	row_pointers = (png_bytepp) MEM_mallocN(ibuf->y * sizeof(png_bytep), "row_pointers");
+	if (row_pointers == NULL) {
+			printf("Cannot allocate row-pointers array\n");
+			return 0;
+	}
+
+	// set the individual row-pointers to point at the correct offsets
+	for (i = 0; i < ibuf->y; i++) {
+		row_pointers[ibuf->y-1-i] = (png_bytep)
+			((unsigned char *)pixels + (i * ibuf->x) * bytesperpixel * sizeof(unsigned char));
+	}
+
+	// write out the entire image data in one call
+	png_write_image(png_ptr, row_pointers);
+
+	// write the additional chunks to the PNG file (not really needed)
+	png_write_end(png_ptr, info_ptr);
+
+	// clean up
+	MEM_freeN(pixels);
+	MEM_freeN(row_pointers);
+	png_destroy_write_struct(&png_ptr, &info_ptr);
+
+	if (fp) {
+		fflush(fp);
+		fclose(fp);
+	}
+
+	return(1);
+}
+