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-rw-r--r--system/png/Makefile11
-rw-r--r--system/png/pdp_png.c409
2 files changed, 420 insertions, 0 deletions
diff --git a/system/png/Makefile b/system/png/Makefile
new file mode 100644
index 0000000..9122da6
--- /dev/null
+++ b/system/png/Makefile
@@ -0,0 +1,11 @@
+
+OBJECTS = pdp_png.o
+
+
+include ../../Makefile.config
+
+all: $(OBJECTS)
+
+clean:
+ rm -f *~
+ rm -f *.o
diff --git a/system/png/pdp_png.c b/system/png/pdp_png.c
new file mode 100644
index 0000000..f751912
--- /dev/null
+++ b/system/png/pdp_png.c
@@ -0,0 +1,409 @@
+
+/*
+ * Pure Data Packet system module. - png glue code
+ * Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "pdp_packet.h"
+#include "pdp_mem.h"
+#include "pdp_post.h"
+#include "pdp_debug.h"
+
+// this is an optional module
+#include "pdp_config.h"
+
+
+#ifdef HAVE_PDP_PNG
+//if 0
+
+#include <png.h>
+
+#define READING 1
+#define WRITING 2
+#define SIG_BYTES 8
+
+#define D if(0)
+
+typedef struct
+{
+ FILE *x_fp;
+
+ int x_kindof; //READING or WRITING
+ png_structp x_png;
+ png_infop x_info;
+ png_infop x_end_info;
+
+ png_uint_32 x_width;
+ png_uint_32 x_height;
+ int x_bit_depth;
+ int x_color_type;
+ int x_interlace_type;
+ int x_compression_type;
+ int x_filter_type;
+
+ int x_pdp_bitmap_type;
+ int x_packet;
+
+} t_png_image;
+
+static t_png_image *_init(t_png_image *x)
+{
+ x->x_png = 0;
+ x->x_info = 0;
+ x->x_end_info = 0;
+ x->x_fp = 0;
+ x->x_packet = -1;
+ return x;
+}
+
+static int _cleanup(t_png_image *x)
+{
+#define INTERNAL_ERROR 1
+ if (!x) return 1;
+ pdp_packet_mark_unused(x->x_packet);
+ if (x->x_png)
+ switch(x->x_kindof){
+ case READING: png_destroy_read_struct(&x->x_png, &x->x_info, &x->x_end_info); break;
+ case WRITING: png_destroy_write_struct(&x->x_png, &x->x_info); break;
+ default: PDP_ASSERT(INTERNAL_ERROR);
+ }
+ if (x->x_fp) fclose(x->x_fp);
+ return 1;
+}
+
+static int _open_read(t_png_image* x, char *file)
+{
+ char header[SIG_BYTES];
+ int is_png;
+
+ x->x_fp = fopen(file, "r");
+ if (!x->x_fp) {
+ D pdp_post("can't open %s for reading", file);
+ return 0;
+ }
+ fread(header, 1, SIG_BYTES, x->x_fp);
+ is_png = !png_sig_cmp(header, 0, SIG_BYTES);
+
+ D pdp_post("%s is %s png file", file, is_png ? "a" : "not a");
+
+ return is_png;
+}
+
+static int _open_write(t_png_image* x, char *file)
+{
+ char header[SIG_BYTES];
+ int is_png;
+
+ x->x_fp = fopen(file, "w");
+ if (!x->x_fp) {
+ D pdp_post("can't open %s for writing", file);
+ return 0;
+ }
+
+ return 1;
+}
+
+/* progress callback */
+
+static void _row_callback(png_structp p, png_uint_32 row, int pass)
+{
+ fprintf(stderr, ".");
+}
+
+static int _initio_read(t_png_image *x)
+{
+ png_init_io(x->x_png, x->x_fp);
+ png_set_sig_bytes(x->x_png, SIG_BYTES);
+ D png_set_read_status_fn(x->x_png, _row_callback);
+ return 1;
+
+}
+
+static int _initio_write(t_png_image *x)
+{
+ png_init_io(x->x_png, x->x_fp);
+ D png_set_write_status_fn(x->x_png, _row_callback);
+
+ return 1;
+
+}
+
+static int _checkimagetype(t_png_image *x)
+{
+ png_read_info(x->x_png, x->x_info);
+ png_get_IHDR(x->x_png, x->x_info, &x->x_width, &x->x_height,
+ &x->x_bit_depth, &x->x_color_type, &x->x_interlace_type,
+ &x->x_compression_type, &x->x_filter_type);
+
+ D pdp_post("image info: w=%d, h=%d, depth=%d, type=%d",
+ (int)x->x_width, (int)x->x_height, (int)x->x_bit_depth,
+ (int)x->x_color_type);
+
+
+ /* handle paletted images: convert to 8 bit RGB(A) */
+ if (x->x_color_type == PNG_COLOR_TYPE_PALETTE &&
+ x->x_bit_depth <= 8) {
+ png_set_expand(x->x_png);
+ D pdp_post("convert palette");
+
+ /* check if there's an alpha channel and set PDP_BITMAP type */
+ x->x_pdp_bitmap_type =
+ (png_get_valid(x->x_png, x->x_info, PNG_INFO_tRNS)) ?
+ PDP_BITMAP_RGBA : PDP_BITMAP_RGB;
+
+ return 1;
+ }
+
+ /* handle bitdepth */
+ if (x->x_bit_depth < 8) {
+ png_set_expand(x->x_png);
+ D pdp_post("convert greyscale to 8 bit");
+ }
+ if (x->x_bit_depth == 16){
+ D pdp_post("stripping 16 bit to 8 bit");
+ png_set_strip_16(x->x_png);
+ }
+
+
+ /* handle greyscale images */
+ if (x->x_color_type == PNG_COLOR_TYPE_GRAY){
+ x->x_pdp_bitmap_type = PDP_BITMAP_GREY;
+ if (png_get_valid(x->x_png, x->x_info, PNG_INFO_tRNS)){
+ D pdp_post("no support for greyscale images with alpha info");
+ return 0;
+ }
+ return 1;
+ }
+
+ /* handle RGB imges */
+ if (x->x_color_type = PNG_COLOR_TYPE_RGB){
+ x->x_pdp_bitmap_type = PDP_BITMAP_RGB;
+ return 1;
+ }
+
+ /* handle RGBA imges */
+ if (x->x_color_type = PNG_COLOR_TYPE_RGBA){
+ x->x_pdp_bitmap_type = PDP_BITMAP_RGBA;
+ return 1;
+ }
+
+
+ /* can't handle image type */
+ D pdp_post("image type not supported");
+ return 0;
+
+}
+
+#define user_error_ptr NULL
+#define user_error_fn NULL
+#define user_warning_fn NULL
+
+static int _buildstruct_read(t_png_image *x)
+{
+ x->x_kindof = READING;
+
+ if (!(x->x_png = png_create_read_struct
+ (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
+ user_error_fn, user_warning_fn))) return 0;
+
+ if (!(x->x_info = png_create_info_struct(x->x_png))) return 0;
+ if (!(x->x_end_info = png_create_info_struct(x->x_png))) return 0;
+
+ return 1;
+}
+
+static int _buildstruct_write(t_png_image *x)
+{
+ x->x_kindof = WRITING;
+
+ if (!(x->x_png = png_create_write_struct
+ (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
+ user_error_fn, user_warning_fn))) return 0;
+
+ if (!(x->x_info = png_create_info_struct(x->x_png))) return 0;
+
+ return 1;
+}
+
+static int _getimagedata(t_png_image *x)
+{
+ int nbchans = 0;
+ char *image_data;
+ png_bytep row_pointers[x->x_height];
+ png_uint_32 i;
+
+ D pdp_post("reading %d rows ", (int)x->x_height);
+
+ switch (x->x_pdp_bitmap_type){
+ case PDP_BITMAP_GREY: nbchans = 1; break;
+ case PDP_BITMAP_RGB: nbchans = 3; break;
+ case PDP_BITMAP_RGBA: nbchans = 4; break;
+ default:
+ return 0;
+ }
+
+ x->x_packet =
+ pdp_packet_new_bitmap(x->x_pdp_bitmap_type, x->x_width, x->x_height);
+ if (!(image_data = pdp_packet_data(x->x_packet))) return 0;
+
+ for(i=0; i<x->x_height; i++)
+ row_pointers[i] = image_data + nbchans * i * x->x_width;
+
+ png_read_image(x->x_png, row_pointers);
+
+ D pdp_post("DONE");
+
+ return 1;
+}
+
+static int _saveimagedata(t_png_image *x, int packet)
+{
+ png_bytep *row_pointers;
+ png_uint_32 i;
+ int nbchans;
+ t_pdp *h = pdp_packet_header(packet);
+ char *image_data = (char *)pdp_packet_data(packet);
+
+ if (!h) return 0;
+ if (PDP_BITMAP != h->type) return 0;
+ if (!image_data) return 0;
+
+ x->x_width = h->info.bitmap.width;
+ x->x_height = h->info.bitmap.height;
+
+ switch(h->info.image.encoding){
+ case PDP_BITMAP_GREY: x->x_color_type = PNG_COLOR_TYPE_GRAY; nbchans = 1; break;
+ case PDP_BITMAP_RGB: x->x_color_type = PNG_COLOR_TYPE_RGB; nbchans = 3; break;
+ case PDP_BITMAP_RGBA: x->x_color_type = PNG_COLOR_TYPE_RGBA; nbchans = 4; break;
+ default: return 0;
+ }
+
+ png_set_IHDR(x->x_png, x->x_info, x->x_width, x->x_height, 8,
+ x->x_color_type, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
+ PNG_FILTER_TYPE_DEFAULT);
+
+ png_write_info(x->x_png, x->x_info);
+
+ D pdp_post("writing %d rows ", (int)x->x_height);
+
+ row_pointers = (png_bytep *)pdp_alloc(sizeof(png_bytep) * x->x_height);
+ for(i=0; i<x->x_height; i++)
+ row_pointers[i] = image_data + nbchans * i * x->x_width;
+
+ png_write_image(x->x_png, row_pointers);
+ png_write_end(x->x_png, x->x_info);
+ pdp_dealloc(row_pointers);
+
+ D pdp_post("DONE");
+
+ return 1;
+}
+
+
+
+/* simple functions to load and save png images */
+
+int pdp_packet_bitmap_from_png_file(char *filename)
+{
+ int packet = -1;
+ t_png_image _x;
+ t_png_image *x = &_x;
+
+ if (!_init(x)) goto exit;
+ if (!_open_read(x, filename)) goto exit;
+ if (!_buildstruct_read(x)) goto exit;
+ if (!_initio_read(x)) goto exit;
+ if (!_checkimagetype(x)) goto exit;
+ if (!_getimagedata(x)) goto exit;
+
+ packet = x->x_packet;
+ x->x_packet = -1;
+ _cleanup(x);
+ return packet;
+ exit:
+ _cleanup(x);
+ return -1;
+
+}
+
+
+
+int pdp_packet_bitmap_save_png_file(int packet, char *filename)
+{
+
+ t_png_image _x;
+ t_png_image *x = &_x;
+
+ if (!_init(x)) goto exit;
+ if (!_open_write(x, filename)) goto exit;
+ if (!_buildstruct_write(x)) goto exit;
+ if (!_initio_write(x)) goto exit;
+ if (!_saveimagedata(x, packet)) goto exit;
+
+ _cleanup(x);
+ return 1;
+ exit:
+ _cleanup(x);
+ return 0;
+
+}
+
+
+
+#else //PDP_HAVE_PNG
+int pdp_packet_bitmap_save_png_file(int packet, char *filename)
+{
+ pdp_post("WARNING: no png support, can't save png file %s", filename);
+ return 0;
+}
+
+int pdp_packet_bitmap_from_png_file(char *filename)
+{
+ pdp_post("WARNING: no png support, can't load png file %s", filename);
+ return -1;
+}
+
+
+#endif //PDP_HAVE_PNG
+
+
+
+
+
+
+
+
+
+
+
+
+
+#if 0
+int main(int argc, char **argv)
+{
+ char *image = 0;
+
+ if (argc != 2)
+ pdp_post("usage: %s <png file>", argv[0]);
+ else
+ image = load_png(argv[1]);
+
+ pdp_post ("%s", image ? "OK" : "ERROR");
+
+}
+#endif
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-04 13:34:47 +0000