initial commit

git-svn-id: http://gdk-pixbuf-psd.googlecode.com/svn/trunk@2 c5539ac3-5556-0410-9a1f-7faf0b045682

2 files changed, 265 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4f667b4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+# ok, our Makefile slightly sucks at the moment
+
+CC = gcc
+CFLAGS=-Wall -std=c99
+
+all:
+        $(CC) $(CFLAGS) io-psd.c  -o libpixbufloader-psd.so \
+                `pkg-config --cflags gtk+-2.0` \
+                -shared -fpic -DGDK_PIXBUF_ENABLE_BACKEND
+
+# and then run the following as root:
+# gdk-pixbuf-query-loaders libpixbufloader-psd.so >> /etc/gtk-2.0/gdk-pixbuf.loaders
+
+
diff --git a/io-psd.c b/io-psd.c
new file mode 100644
index 0000000..664d42f
--- /dev/null
+++ b/io-psd.c
@@ -0,0 +1,251 @@
+/* -*- mode: C; c-file-style: "linux" -*- */
+/* GdkPixbuf library - PSD image loader
+ *
+ * Copyright (C) 2008 Jan Dudek
+ *
+ * Authors: Jan Dudek <jd@jandudek.com>
+ *
+ * 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
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <gdk-pixbuf/gdk-pixbuf-io.h>
+#include <glib/gstdio.h>
+
+
+typedef struct
+{
+        guchar  signature[4];  /* file ID, always "8BPS" */
+        guint16 version;       /* version number, always 1 */
+        guchar  reserved[6];
+        guint8  channels;      /* number of color channels (1-24) */
+        guint32 rows;          /* height of image in pixels (1-30000) */
+        guint32 columns;       /* width of image in pixels (1-30000) */
+        guint16 depth;         /* number of bits per channel (1, 8, and 16) */
+        guint16 color_mode;    /* color mode as defined below */
+} PsdHeader;
+
+typedef enum
+{
+        PSD_MODE_MONO = 0,
+        PSD_MODE_GRAYSCALE = 1,
+        PSD_MODE_INDEXED = 2,
+        PSD_MODE_RGB = 3,
+        PSD_MODE_CMYK = 4,
+        PSD_MODE_MULTICHANNEL = 7,
+        PSD_MODE_DUOTONE = 8,
+        PSD_MODE_LAB = 9,
+} PsdColorMode;
+
+typedef enum
+{
+        PSD_COMPRESSION_NONE = 0,
+        PSD_COMPRESSION_RLE = 1
+} PsdCompressionType;
+
+static guint16
+read_uint16 (FILE *fp)
+{
+        guint16 t;
+        t = fgetc(fp) << 8;
+        t |= fgetc(fp);
+        return t;
+}
+
+static guint32
+read_uint32 (FILE *fp)
+{
+        guint32 t;
+        t = fgetc(fp) << 24;
+        t |= fgetc(fp) << 16;
+        t |= fgetc(fp) << 8;
+        t |= fgetc(fp);
+        return t;
+}
+
+static PsdHeader
+psd_read_header (FILE *fp)
+{
+        PsdHeader hd;
+        int t;
+
+        fread(hd.signature, 1, 4, fp);
+        hd.version = read_uint16(fp);
+        fread(hd.reserved, 1, 6, fp);
+        hd.channels = read_uint16(fp);
+        hd.rows = read_uint32(fp);
+        hd.columns = read_uint32(fp);
+        hd.depth = read_uint16(fp);
+        hd.color_mode = read_uint16(fp);
+
+        // skip Color Mode Data Block
+        t = read_uint32(fp);
+        fseek(fp, t, SEEK_CUR);
+        
+        // skip Image Resources Block
+        t = read_uint32(fp);
+        fseek(fp, t, SEEK_CUR);
+        
+        // skip Layer and Mask Information Block
+        t = read_uint32(fp);
+        fseek(fp, t, SEEK_CUR);
+
+        return hd;
+}
+
+static GdkPixbuf*
+gdk_pixbuf__psd_image_load (FILE *fp,
+                            GError **error)
+{
+        guint rowstride;
+        guint16 compression_type;
+        guchar *pixels;
+        GdkPixbuf *pixbuf;
+        guchar **buffers;
+
+        PsdHeader hd = psd_read_header(fp);
+        pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, hd.columns, hd.rows);
+
+        if (pixbuf == NULL) {
+                g_set_error (error, GDK_PIXBUF_ERROR,
+                        GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
+                        ("Insufficient memory to load PSD image file"));
+                return NULL;
+        }
+        
+        pixels = gdk_pixbuf_get_pixels (pixbuf);
+        rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+        
+        compression_type = read_uint16(fp);
+        
+        if (compression_type != PSD_COMPRESSION_NONE &&
+            compression_type != PSD_COMPRESSION_RLE) {
+                g_set_error (error, GDK_PIXBUF_ERROR,
+                        GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
+                        ("Unsupported compression type"));
+                return NULL;
+        }
+        
+        if (hd.color_mode != PSD_MODE_RGB) {
+                g_set_error (error, GDK_PIXBUF_ERROR,
+                        GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
+                        ("Unsupported color mode"));
+                return NULL;
+        }
+        
+        //g_message("mode=%d, channels=%d", hd.color_mode, hd.channels);
+        
+        buffers = g_malloc(sizeof(guchar*) * hd.channels);
+        
+        if (compression_type == PSD_COMPRESSION_RLE) {
+                guint16 *line_lengths = g_malloc(2 * hd.rows * hd.channels);
+                
+                for (int i = 0; i < hd.rows * hd.channels; ++i) {
+                        line_lengths[i] = read_uint16(fp);
+                }
+                
+                for (int i = 0; i < hd.channels; ++i) {
+                        buffers[i] = g_malloc(hd.rows * hd.columns);
+                        gint position = 0;
+
+                        for (int j = 0; j < hd.rows; ++j) {
+                                guint16 bytes_read = 0;
+                                while (bytes_read < line_lengths[i * hd.rows + j]) {
+                                        gchar byte = fgetc(fp);
+                                        ++bytes_read;
+                                        
+                                        if (byte == -128) {
+                                                continue;
+                                        } else if (byte > -1) {
+                                                gint count = byte + 1;
+                                                
+                                                // copy next count bytes
+                                                for (int k = 0; k < count; ++k) {
+                                                        buffers[i][position] = fgetc(fp);
+                                                        ++bytes_read;
+                                                        ++position;
+                                                }
+                                        } else {
+                                                gint count = -byte + 1;
+                                                
+                                                // copy next byte count times
+                                                guchar next_byte = fgetc(fp);
+                                                ++bytes_read; 
+                                                for (int k = 0; k < count; ++k) {
+                                                        buffers[i][position] = next_byte;
+                                                        ++position;
+                                                }
+                                        }
+                                }
+                        }
+                }
+                
+                g_free(line_lengths);
+        }
+        
+        if (hd.color_mode == PSD_MODE_RGB) {
+                for (int i = 0; i < hd.rows; ++i) {
+                        for (int j = 0; j < hd.columns; ++j) {
+                                pixels[i * rowstride + 3 * j + 0] = buffers[0][i * hd.columns + j];
+                                pixels[i * rowstride + 3 * j + 1] = buffers[1][i * hd.columns + j];
+                                pixels[i * rowstride + 3 * j + 2] = buffers[2][i * hd.columns + j];
+                        }
+                }
+        }
+        // TODO: other color modes, CMYK at least
+        
+        return pixbuf;
+}
+
+void
+fill_vtable (GdkPixbufModule* module)
+{
+/*      module->load = gdk_pixbuf__xbm_image_load;
+        module->begin_load = gdk_pixbuf__xbm_image_begin_load;
+        module->stop_load = gdk_pixbuf__xbm_image_stop_loads
+        module->load_increment = gdk_pixbuf__xbm_image_load_increment;*/
+        // TODO progressive loading
+
+        module->load = gdk_pixbuf__psd_image_load;
+}
+
+void
+fill_info (GdkPixbufFormat *info)
+{
+        static GdkPixbufModulePattern signature[] = {
+                { "8BPS", NULL, 100 },
+                { NULL, NULL, 0 }
+        };
+        static gchar * mime_types[] = {
+                "image/x-psd",
+                NULL
+        };
+        static gchar * extensions[] = {
+                "psd",
+                NULL
+        };
+
+        info->name = "psd";
+        info->signature = signature;
+        //info->description = N_("Adobe Photoshop format");
+        info->description = "Adobe Photoshop format";
+        info->mime_types = mime_types;
+        info->extensions = extensions;
+        info->flags = GDK_PIXBUF_FORMAT_THREADSAFE;
+        info->flags = 0;
+        info->license = "LGPL";
+}
+