[gnome-photos/wip/rishi/buffer-decoder: 1/2] Add PhotosGeglBufferCodecJpeg
- From: Debarshi Ray <debarshir src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gnome-photos/wip/rishi/buffer-decoder: 1/2] Add PhotosGeglBufferCodecJpeg
- Date: Wed, 12 Sep 2018 11:55:28 +0000 (UTC)
commit 2efda2601e443606bdb89b9c9432d6830b91bade
Author: Debarshi Ray <debarshir gnome org>
Date: Sun Apr 29 00:20:35 2018 +0200
Add PhotosGeglBufferCodecJpeg
Bump minimum Babl version to 0.1.54, and libjpeg-turbo version to
2.0.0.
https://gitlab.gnome.org/GNOME/gnome-photos/issues/63
configure.ac | 6 +-
meson.build | 4 +-
src/Makefile.am | 4 +
src/meson.build | 1 +
src/photos-gegl-buffer-codec-jpeg.c | 938 ++++++++++++++++++++++++++++++++++++
src/photos-gegl-buffer-codec-jpeg.h | 39 ++
6 files changed, 988 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f6f4e7c7..e2c16ab1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,6 +38,7 @@ AC_SUBST(LIBM)
GLIB_GSETTINGS
+BABL_MIN_VERSION=0.1.54
CAIRO_MIN_VERSION=1.14.0
DAZZLE_MIN_VERSION=3.26.0
GDATA_MIN_VERSION=0.15.2
@@ -49,6 +50,7 @@ GLIB_MIN_VERSION=2.57.2
GOA_MIN_VERSION=3.8.0
GRILO_MIN_VERSION=0.3.5
GTK_MIN_VERSION=3.22.16
+JPEG_MIN_VERSION=2.0.0
G_LOG_DOMAIN=AC_PACKAGE_TARNAME
AC_DEFINE_UNQUOTED([G_LOG_DOMAIN], ["$G_LOG_DOMAIN"], [Log domain])
@@ -82,7 +84,7 @@ if test "$have_langinfo_measurement" = "yes"; then
[Define if _NL_MEASUREMENT_MEASUREMENT is available])
fi
-PKG_CHECK_MODULES(BABL, [babl])
+PKG_CHECK_MODULES(BABL, [babl >= $BABL_MIN_VERSION])
PKG_CHECK_MODULES(CAIRO, [cairo >= $CAIRO_MIN_VERSION cairo-gobject])
PKG_CHECK_MODULES(DAZZLE, [libdazzle-1.0 >= $DAZZLE_MIN_VERSION])
PKG_CHECK_MODULES(GFBGRAPH, [libgfbgraph-0.2 >= $GFBGRAPH_MIN_VERSION])
@@ -101,7 +103,7 @@ PKG_CHECK_MODULES(GRILO, [grilo-0.3 >= $GRILO_MIN_VERSION])
PKG_CHECK_MODULES(GSETTINGS_DESKTOP_SCHEMAS, [gsettings-desktop-schemas])
PKG_CHECK_MODULES(GTK, [gtk+-3.0 >= $GTK_MIN_VERSION])
PKG_CHECK_MODULES(GTK_UNIX_PRINT, [gtk+-unix-print-3.0])
-PKG_CHECK_MODULES(JPEG, [libjpeg])
+PKG_CHECK_MODULES(JPEG, [libjpeg >= $JPEG_MIN_VERSION])
PKG_CHECK_MODULES(PNG, [libpng16])
PKG_CHECK_MODULES(TRACKER, [tracker-control-2.0 tracker-sparql-2.0])
diff --git a/meson.build b/meson.build
index a4ee73ef..0474373b 100644
--- a/meson.build
+++ b/meson.build
@@ -124,7 +124,7 @@ libgd = subproject(
)
libgd_dep = libgd.get_variable('libgd_dep')
-babl_dep = dependency('babl')
+babl_dep = dependency('babl', version: '>= 0.1.54')
cairo_dep = dependency('cairo', version: '>= 1.14.0')
gdk_pixbuf_dep = dependency('gdk-pixbuf-2.0', version: '>= 2.32')
gegl_dep = dependency('gegl-0.4', version: '>= 0.4.0')
@@ -144,7 +144,7 @@ gtk_unix_print_dep = dependency('gtk+-unix-print-3.0')
libdazzle_dep = dependency('libdazzle-1.0', version: '>= 3.26.0')
libgdata_dep = dependency('libgdata', version: '>= 0.15.2')
libgfgraph_dep = dependency('libgfbgraph-0.2', version: '>= 0.2.1')
-libjpeg_dep = dependency('libjpeg')
+libjpeg_dep = dependency('libjpeg', version: '>= 2.0.0')
libpng_dep = dependency('libpng16')
tracker_control_dep = dependency('tracker-control-2.0')
tracker_sparql_dep = dependency('tracker-sparql-2.0')
diff --git a/src/Makefile.am b/src/Makefile.am
index 3285fa95..9174762f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -106,6 +106,8 @@ gnome_photos_SOURCES = \
photos-gegl.h \
photos-gegl-buffer-codec.c \
photos-gegl-buffer-codec.h \
+ photos-gegl-buffer-codec-jpeg.c \
+ photos-gegl-buffer-codec-jpeg.h \
photos-gegl-buffer-loader.c \
photos-gegl-buffer-loader.h \
photos-gegl-buffer-loader-builder.c \
@@ -330,6 +332,8 @@ gnome_photos_thumbnailer_SOURCES = \
photos-gegl.h \
photos-gegl-buffer-codec.c \
photos-gegl-buffer-codec.h \
+ photos-gegl-buffer-codec-jpeg.c \
+ photos-gegl-buffer-codec-jpeg.h \
photos-gegl-buffer-loader.c \
photos-gegl-buffer-loader.h \
photos-gegl-buffer-loader-builder.c \
diff --git a/src/meson.build b/src/meson.build
index 98545bb1..2a6b9222 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -3,6 +3,7 @@ common_sources = files(
'photos-error.c',
'photos-gegl.c',
'photos-gegl-buffer-codec.c',
+ 'photos-gegl-buffer-codec-jpeg.c',
'photos-gegl-buffer-loader.c',
'photos-gegl-buffer-loader-builder.c',
'photos-glib.c',
diff --git a/src/photos-gegl-buffer-codec-jpeg.c b/src/photos-gegl-buffer-codec-jpeg.c
new file mode 100644
index 00000000..6693a36e
--- /dev/null
+++ b/src/photos-gegl-buffer-codec-jpeg.c
@@ -0,0 +1,938 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 1999 The Free Software Foundation
+ * Copyright © 1999 Michael Zucchi
+ * Copyright © 2006 Øyvind Kolås
+ * Copyright © 2018 Red Hat, Inc.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on code from:
+ * + GdkPixbuf
+ * + GEGL
+ */
+
+
+#include "config.h"
+
+#include <setjmp.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <gegl.h>
+#include <glib/gi18n.h>
+#include <jpeglib.h>
+
+#include "photos-error.h"
+#include "photos-gegl.h"
+#include "photos-gegl-buffer-codec-jpeg.h"
+
+
+enum
+{
+ SOURCE_BUF_SIZE = 65536
+};
+
+typedef struct _PhotosJpegErrorMgr PhotosJpegErrorMgr;
+typedef struct _PhotosJpegSourceMgr PhotosJpegSourceMgr;
+
+struct _PhotosJpegErrorMgr
+{
+ struct jpeg_error_mgr pub;
+ GError **error;
+ sigjmp_buf setjmp_buffer;
+};
+
+struct _PhotosJpegSourceMgr
+{
+ struct jpeg_source_mgr pub;
+ JOCTET buffer[SOURCE_BUF_SIZE];
+ gsize skip_next;
+};
+
+struct _PhotosGeglBufferCodecJpeg
+{
+ PhotosGeglBufferCodec parent_instance;
+ GeglBuffer *buffer;
+ GeglBuffer *buffer_mipmap;
+ GeglMatrix2 inverse_jacobian;
+ GeglSampler *sampler;
+ JDIMENSION stride_mipmap;
+ JSAMPARRAY lines;
+ PhotosJpegErrorMgr jerr;
+ PhotosJpegSourceMgr src;
+ gboolean can_set_size;
+ gboolean decoding;
+ gboolean did_prescan;
+ gboolean got_header;
+ gboolean in_output;
+ gboolean pending_zoom_from_mipmap;
+ gboolean src_initialized;
+ gdouble zoom_from_mipmap_x;
+ gdouble zoom_from_mipmap_y;
+ gint mipmap_height_needed_for_zoom;
+ gint mipmap_width_needed_for_zoom;
+ gint scanline;
+ gint tile_height;
+ gint tile_stride;
+ gint tile_width;
+ gpointer tile_memory;
+ struct jpeg_decompress_struct cinfo;
+};
+
+enum
+{
+ PROP_0,
+ PROP_BUFFER,
+ PROP_CAN_SET_SIZE
+};
+
+
+G_DEFINE_TYPE_WITH_CODE (PhotosGeglBufferCodecJpeg, photos_gegl_buffer_codec_jpeg,
PHOTOS_TYPE_GEGL_BUFFER_CODEC,
+ photos_gegl_ensure_extension_points ();
+ g_io_extension_point_implement (PHOTOS_GEGL_BUFFER_CODEC_EXTENSION_POINT_NAME,
+ g_define_type_id,
+ "jpeg",
+ 0));
+
+
+static const gchar *MIME_TYPES[] =
+{
+ "image/jpeg",
+ NULL
+};
+
+
+static const gchar *
+photos_gegl_buffer_codec_jpeg_get_colorspace_name (J_COLOR_SPACE jpeg_color_space)
+{
+ const gchar *ret_val = NULL;
+
+ switch (jpeg_color_space)
+ {
+ case JCS_UNKNOWN:
+ ret_val = "UNKNOWN";
+ break;
+
+ case JCS_CMYK:
+ ret_val = "CMYK";
+ break;
+
+ case JCS_GRAYSCALE:
+ ret_val = "GRAYSCALE";
+ break;
+
+ case JCS_RGB:
+ ret_val = "RGB";
+ break;
+
+ case JCS_YCbCr:
+ ret_val = "YCbCr";
+ break;
+
+ case JCS_YCCK:
+ ret_val = "YCCK";
+ break;
+
+ case JCS_EXT_ARGB:
+ case JCS_EXT_ABGR:
+ case JCS_EXT_BGR:
+ case JCS_EXT_BGRA:
+ case JCS_EXT_BGRX:
+ case JCS_EXT_RGB:
+ case JCS_EXT_RGBA:
+ case JCS_EXT_RGBX:
+ case JCS_EXT_XBGR:
+ case JCS_EXT_XRGB:
+ case JCS_RGB565:
+ default:
+ ret_val = "invalid";
+ break;
+ }
+
+ return ret_val;
+}
+
+
+static const Babl *
+photos_gegl_buffer_codec_jpeg_get_format (J_COLOR_SPACE jpeg_color_space,
+ JOCTET *icc_profile,
+ guint icc_profile_len)
+{
+ const Babl *format = NULL;
+ const Babl *ret_val = NULL;
+ const Babl *space = NULL;
+ const Babl *type;
+ const Babl *type_u8;
+
+ type_u8 = babl_type ("u8");
+
+ if (icc_profile != NULL)
+ {
+ const gchar *error_message = NULL;
+
+ space = babl_space_from_icc ((gchar *) icc_profile,
+ (gint) icc_profile_len,
+ BABL_ICC_INTENT_RELATIVE_COLORIMETRIC,
+ &error_message);
+ if (space == NULL)
+ g_warning ("Unable to create Babl space from ICC profile: %s", error_message);
+ }
+
+ switch (jpeg_color_space)
+ {
+ case JCS_CMYK:
+ format = babl_format_with_space ("CMYK u8", space);
+ break;
+
+ case JCS_GRAYSCALE:
+ format = babl_format_with_space ("Y' u8", space);
+ break;
+
+ case JCS_RGB:
+ format = babl_format_with_space ("R'G'B' u8", space);
+ break;
+
+ case JCS_YCbCr:
+ case JCS_YCCK:
+ case JCS_EXT_ARGB:
+ case JCS_EXT_ABGR:
+ case JCS_EXT_BGR:
+ case JCS_EXT_BGRA:
+ case JCS_EXT_BGRX:
+ case JCS_EXT_RGB:
+ case JCS_EXT_RGBA:
+ case JCS_EXT_RGBX:
+ case JCS_EXT_XBGR:
+ case JCS_EXT_XRGB:
+ case JCS_RGB565:
+ case JCS_UNKNOWN:
+ default:
+ goto out;
+ break;
+ }
+
+ type = babl_format_get_type (format, 0);
+ g_return_val_if_fail (type == type_u8, NULL);
+
+ ret_val = format;
+
+ out:
+ return ret_val;
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_error_exit (j_common_ptr cinfo)
+{
+ PhotosJpegErrorMgr *jerr = (PhotosJpegErrorMgr *) cinfo->err;
+ gchar buffer[JMSG_LENGTH_MAX];
+
+ cinfo->err->format_message (cinfo, buffer);
+
+ /* Check for *error == NULL for robustness against crappy JPEG
+ * library.
+ */
+ if (jerr->error && *jerr->error == NULL)
+ g_set_error (jerr->error, PHOTOS_ERROR, 0, _("Error interpreting JPEG image file (%s)"), buffer);
+
+ siglongjmp (jerr->setjmp_buffer, 1);
+ g_assert_not_reached ();
+}
+
+
+static gboolean
+photos_gegl_buffer_codec_jpeg_fill_input_buffer (j_decompress_ptr cinfo)
+{
+ return FALSE;
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_init_source (j_decompress_ptr cinfo)
+{
+ PhotosJpegSourceMgr *src = (PhotosJpegSourceMgr *) cinfo->src;
+ src->skip_next = 0;
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_output_message (j_common_ptr cinfo)
+{
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_skip_input_data (j_decompress_ptr cinfo, glong num_bytes)
+{
+ PhotosJpegSourceMgr *src = (PhotosJpegSourceMgr *) cinfo->src;
+ glong num_can_do;
+
+ if (num_bytes > 0)
+ {
+ num_can_do = MIN (src->pub.bytes_in_buffer, (gsize) num_bytes);
+ src->pub.next_input_byte += (gsize) num_can_do;
+ src->pub.bytes_in_buffer -= (gsize) num_can_do;
+ src->skip_next = (gsize) (num_bytes - num_can_do);
+ }
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_term_source (j_decompress_ptr cinfo)
+{
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_zoom_from_mipmap (PhotosGeglBufferCodecJpeg *self)
+{
+ const Babl *format;
+ const Babl *format_mipmap;
+ GeglRectangle bbox_tile;
+ gint buffer_width;
+ gint tile_row;
+
+ format = gegl_buffer_get_format (self->buffer);
+ g_return_if_fail (format != NULL);
+
+ format_mipmap = gegl_buffer_get_format (self->buffer_mipmap);
+ g_return_if_fail (format == format_mipmap);
+
+ bbox_tile.height = self->tile_height;
+ bbox_tile.width = self->tile_width;
+ bbox_tile.x = 0;
+
+ tile_row = (self->scanline - 1) / self->mipmap_height_needed_for_zoom;
+ bbox_tile.y = tile_row * self->tile_height;
+
+ buffer_width = gegl_buffer_get_width (self->buffer);
+
+ if (G_APPROX_VALUE (self->zoom_from_mipmap_x, self->zoom_from_mipmap_y, PHOTOS_EPSILON))
+ {
+ for (bbox_tile.x = 0; bbox_tile.x < buffer_width; bbox_tile.x += self->tile_width)
+ {
+ gegl_buffer_get (self->buffer_mipmap,
+ &bbox_tile,
+ self->zoom_from_mipmap_x,
+ format,
+ self->tile_memory,
+ self->tile_stride,
+ GEGL_ABYSS_NONE | GEGL_BUFFER_FILTER_AUTO);
+
+ gegl_buffer_set (self->buffer, &bbox_tile, 0, format, self->tile_memory, self->tile_stride);
+ }
+ }
+ else
+ {
+ GeglSamplerGetFun sampler_get_fun;
+ const gdouble u_base = self->inverse_jacobian.coeff[0][0] * 0.5;
+ const gdouble v_base = self->inverse_jacobian.coeff[1][1] * 0.5;
+ const gdouble v_tile = v_base + self->inverse_jacobian.coeff[1][1] * bbox_tile.y;
+ gint bpp;
+ gint j;
+ gint k;
+ guchar *tile_memory = (guchar *) self->tile_memory;
+
+ sampler_get_fun = gegl_sampler_get_fun (self->sampler);
+ bpp = babl_format_get_bytes_per_pixel (format);
+
+ for (bbox_tile.x = 0; bbox_tile.x < buffer_width; bbox_tile.x += self->tile_width)
+ {
+ gdouble u_tile = u_base + self->inverse_jacobian.coeff[0][0] * bbox_tile.x;
+ gdouble v = v_tile;
+
+ for (j = 0; j < self->tile_height; j++)
+ {
+ gdouble u = u_tile;
+
+ for (k = 0; k < self->tile_width; k++)
+ {
+ sampler_get_fun (self->sampler, u, v, &self->inverse_jacobian, tile_memory,
GEGL_ABYSS_NONE);
+ tile_memory += bpp;
+ u += self->inverse_jacobian.coeff[0][0];
+ }
+
+ v += self->inverse_jacobian.coeff[1][1];
+ }
+
+ gegl_buffer_set (self->buffer, &bbox_tile, 0, format, self->tile_memory, self->tile_stride);
+ }
+ }
+}
+
+
+static gboolean
+photos_gegl_buffer_codec_jpeg_load_lines (PhotosGeglBufferCodecJpeg *self, GError **error)
+{
+ const Babl *cmyk_u8;
+ const Babl *format;
+ GeglRectangle bbox_scanline;
+
+ cmyk_u8 = babl_format ("CMYK u8");
+ format = gegl_buffer_get_format (self->buffer_mipmap);
+
+ gegl_rectangle_set (&bbox_scanline, 0, self->scanline, (guint) self->cinfo.output_width, 1);
+
+ while (self->cinfo.output_scanline < self->cinfo.output_height)
+ {
+ JDIMENSION i;
+ JDIMENSION num_lines;
+
+ num_lines = jpeg_read_scanlines (&self->cinfo, self->lines, self->cinfo.rec_outbuf_height);
+ if (num_lines == 0)
+ break;
+
+ for (i = 0; i < num_lines; i++)
+ {
+ /* Assume that all CMYK JPEG files use inverted CMYK, as
+ * Photoshop does. See:
+ * https://bugzilla.gnome.org/show_bug.cgi?id=618096
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=674619
+ */
+ if (format == cmyk_u8)
+ {
+ JDIMENSION j;
+
+ for (j = 0; j < self->stride_mipmap; j++)
+ self->lines[i][j] = 255 - self->lines[i][j];
+ }
+
+ gegl_buffer_set (self->buffer_mipmap, &bbox_scanline, 0, format, self->lines[i],
GEGL_AUTO_ROWSTRIDE);
+ self->pending_zoom_from_mipmap = TRUE;
+
+ self->scanline++;
+ bbox_scanline.y = self->scanline;
+
+ if (self->buffer != self->buffer_mipmap && self->scanline % self->mipmap_height_needed_for_zoom ==
0)
+ {
+ photos_gegl_buffer_codec_jpeg_zoom_from_mipmap (self);
+ self->pending_zoom_from_mipmap = FALSE;
+ }
+ }
+ }
+
+ if (self->cinfo.output_scanline >= self->cinfo.output_height && self->pending_zoom_from_mipmap)
+ {
+ photos_gegl_buffer_codec_jpeg_zoom_from_mipmap (self);
+ self->pending_zoom_from_mipmap = FALSE;
+ }
+
+ return TRUE;
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_parse_exif_app1 (PhotosGeglBufferCodecJpeg *self, jpeg_saved_marker_ptr marker)
+{
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_parse_exif (PhotosGeglBufferCodecJpeg *self)
+{
+ jpeg_saved_marker_ptr marker;
+
+ for (marker = self->cinfo.marker_list; marker != NULL; marker = marker->next)
+ {
+ if (marker->marker == JPEG_APP0 + 1)
+ photos_gegl_buffer_codec_jpeg_parse_exif_app1 (self, marker);
+ }
+}
+
+
+static GeglBuffer *
+photos_gegl_buffer_codec_jpeg_get_buffer (PhotosGeglBufferCodec *codec)
+{
+ PhotosGeglBufferCodecJpeg *self = PHOTOS_GEGL_BUFFER_CODEC_JPEG (codec);
+ return self->buffer;
+}
+
+
+static gboolean
+photos_gegl_buffer_codec_jpeg_load_begin (PhotosGeglBufferCodec *codec, GError **error)
+{
+ PhotosGeglBufferCodecJpeg *self = PHOTOS_GEGL_BUFFER_CODEC_JPEG (codec);
+
+ g_return_val_if_fail (!self->decoding, FALSE);
+
+ self->cinfo.err = jpeg_std_error (&self->jerr.pub);
+ self->jerr.pub.error_exit = photos_gegl_buffer_codec_jpeg_error_exit;
+ self->jerr.pub.output_message = photos_gegl_buffer_codec_jpeg_output_message;
+ self->jerr.error = error;
+
+ if (sigsetjmp (self->jerr.setjmp_buffer, 1))
+ {
+ jpeg_destroy_decompress (&self->cinfo);
+ self->decoding = FALSE;
+ goto out;
+ }
+
+ jpeg_create_decompress (&self->cinfo);
+ self->decoding = TRUE;
+
+ self->cinfo.src = (struct jpeg_source_mgr *) &self->src;
+ self->src.pub.init_source = photos_gegl_buffer_codec_jpeg_init_source;
+ self->src.pub.fill_input_buffer = photos_gegl_buffer_codec_jpeg_fill_input_buffer;
+ self->src.pub.skip_input_data = photos_gegl_buffer_codec_jpeg_skip_input_data;
+ self->src.pub.resync_to_restart = jpeg_resync_to_restart;
+ self->src.pub.term_source = photos_gegl_buffer_codec_jpeg_term_source;
+
+ self->jerr.error = NULL;
+
+ g_return_val_if_fail (self->decoding, FALSE);
+
+ out:
+ return self->decoding;
+}
+
+
+static gboolean
+photos_gegl_buffer_codec_jpeg_load_increment (PhotosGeglBufferCodec *codec,
+ const guchar *buf,
+ gsize count,
+ GError **error)
+{
+ PhotosGeglBufferCodecJpeg *self = PHOTOS_GEGL_BUFFER_CODEC_JPEG (codec);
+ gboolean first;
+ gboolean ret_val = FALSE;
+ gsize last_bytes_left;
+ gsize last_num_left;
+ gsize num_left;
+ guint spinguard;
+ const guchar *bufhd;
+
+ g_return_val_if_fail (self->decoding, FALSE);
+
+ self->jerr.error = error;
+
+ if (sigsetjmp (self->jerr.setjmp_buffer, 1))
+ {
+ ret_val = FALSE;
+ goto out;
+ }
+
+ if (self->src_initialized && self->src.skip_next > 0)
+ {
+ if (self->src.skip_next > count)
+ {
+ self->src.skip_next -= count;
+ ret_val = TRUE;
+ goto out;
+ }
+
+ num_left = count - self->src.skip_next;
+ bufhd = buf + self->src.skip_next;
+ self->src.skip_next = 0;
+ }
+ else
+ {
+ num_left = count;
+ bufhd = buf;
+ }
+
+ if (num_left == 0)
+ {
+ ret_val = TRUE;
+ goto out;
+ }
+
+ last_num_left = num_left;
+ last_bytes_left = 0;
+ spinguard = 0;
+ first = TRUE;
+
+ while (TRUE)
+ {
+ if (num_left > 0)
+ {
+ gsize num_copy;
+
+ if (self->src.pub.bytes_in_buffer > 0 && self->src.pub.next_input_byte != self->src.buffer)
+ memmove (self->src.buffer, self->src.pub.next_input_byte, self->src.pub.bytes_in_buffer);
+
+ num_copy = MIN (SOURCE_BUF_SIZE - self->src.pub.bytes_in_buffer, num_left);
+ memcpy (self->src.buffer + self->src.pub.bytes_in_buffer, bufhd, num_copy);
+ self->src.pub.next_input_byte = self->src.buffer;
+ self->src.pub.bytes_in_buffer += num_copy;
+ bufhd += num_copy;
+ num_left -= num_copy;
+ }
+
+ if (first)
+ {
+ last_bytes_left = self->src.pub.bytes_in_buffer;
+ first = FALSE;
+ }
+ else if (self->src.pub.bytes_in_buffer == last_bytes_left && num_left == last_num_left)
+ {
+ spinguard++;
+ }
+ else
+ {
+ last_bytes_left = self->src.pub.bytes_in_buffer;
+ last_num_left = num_left;
+ }
+
+ if (spinguard > 2)
+ {
+ ret_val = TRUE;
+ goto out;
+ }
+
+ if (!self->got_header)
+ {
+ const Babl *format = NULL;
+ GeglRectangle bbox;
+ JDIMENSION height;
+ JDIMENSION width;
+ g_autofree JOCTET *icc_profile = NULL;
+ gint format_components;
+ gint rc;
+ guint icc_profile_len;
+
+ jpeg_save_markers (&self->cinfo, JPEG_APP0 + 1, 0xffff);
+ jpeg_save_markers (&self->cinfo, JPEG_APP0 + 2, 0xffff);
+ jpeg_save_markers (&self->cinfo, JPEG_COM, 0xffff);
+ rc = jpeg_read_header (&self->cinfo, TRUE);
+ self->src_initialized = TRUE;
+
+ if (rc == JPEG_SUSPENDED)
+ continue;
+
+ self->got_header = TRUE;
+
+ height = self->cinfo.image_height;
+ width = self->cinfo.image_width;
+
+ self->can_set_size = TRUE;
+ g_signal_emit_by_name (self, "size-prepared", (guint) width, (guint) height);
+ self->can_set_size = FALSE;
+
+ height = photos_gegl_buffer_codec_get_height (PHOTOS_GEGL_BUFFER_CODEC (self));
+ width = photos_gegl_buffer_codec_get_width (PHOTOS_GEGL_BUFFER_CODEC (self));
+ if (height == 0 || width == 0)
+ {
+ g_set_error_literal (error, PHOTOS_ERROR, 0, _("Transformed JPEG has zero width or height"));
+ ret_val = FALSE;
+ goto out;
+ }
+
+ self->cinfo.scale_num = 1;
+ for (self->cinfo.scale_denom = 2; self->cinfo.scale_denom <= 8; self->cinfo.scale_denom *= 2)
+ {
+ jpeg_calc_output_dimensions (&self->cinfo);
+ if (self->cinfo.output_height < height || self->cinfo.output_width < width)
+ {
+ self->cinfo.scale_denom /= 2;
+ break;
+ }
+ }
+
+ jpeg_calc_output_dimensions (&self->cinfo);
+
+ jpeg_read_icc_profile (&self->cinfo, &icc_profile, &icc_profile_len);
+ format = photos_gegl_buffer_codec_jpeg_get_format (self->cinfo.out_color_space,
+ icc_profile,
+ icc_profile_len);
+ if (format == NULL)
+ {
+ const gchar *colorspace_name;
+
+ colorspace_name = photos_gegl_buffer_codec_jpeg_get_colorspace_name
(self->cinfo.out_color_space);
+ g_set_error (error, PHOTOS_ERROR, 0, _("Unsupported JPEG color space (%s)"), colorspace_name);
+ goto out;
+ }
+
+ format_components = babl_format_get_n_components (format);
+ g_assert_cmpint (format_components, ==, self->cinfo.output_components);
+
+ g_assert_null (self->buffer);
+ g_assert_null (self->buffer_mipmap);
+
+ gegl_rectangle_set (&bbox, 0, 0, (guint) self->cinfo.output_width, (guint)
self->cinfo.output_height);
+ self->buffer_mipmap = gegl_buffer_new (&bbox, format);
+
+ if (self->cinfo.output_height == height && self->cinfo.output_width == width)
+ {
+ self->buffer = g_object_ref (self->buffer_mipmap);
+ }
+ else
+ {
+ gegl_rectangle_set (&bbox, 0, 0, (guint) width, (guint) height);
+ self->buffer = gegl_buffer_new (&bbox, format);
+
+ g_object_get (self->buffer,
+ "tile-height", &self->tile_height,
+ "tile-width", &self->tile_width,
+ NULL);
+
+ self->tile_stride = self->cinfo.output_components * self->tile_width;
+ self->tile_memory = g_malloc0_n (self->tile_height, self->tile_stride);
+
+ self->zoom_from_mipmap_x = (gdouble) width / (gdouble) self->cinfo.output_width;
+ self->zoom_from_mipmap_y = (gdouble) height / (gdouble) self->cinfo.output_height;
+
+ self->mipmap_height_needed_for_zoom = (gint) ((gdouble) self->tile_height
+ * (gdouble) self->cinfo.output_height
+ / (gdouble) height
+ + 0.5);
+ self->mipmap_width_needed_for_zoom = (gint) ((gdouble) self->tile_width
+ * (gdouble) self->cinfo.output_width
+ / (gdouble) width
+ + 0.5);
+
+ if (!G_APPROX_VALUE (self->zoom_from_mipmap_x, self->zoom_from_mipmap_y, PHOTOS_EPSILON))
+ {
+ GeglMatrix3 affine;
+ GeglMatrix3 inverse_affine;
+
+ gegl_matrix3_identity (&affine);
+ affine.coeff[0][0] = zoom_from_mipmap_x;
+ affine.coeff[1][1] = zoom_from_mipmap_y;
+
+ gegl_matrix3_copy_into (&inverse_affine, &affine);
+ gegl_matrix3_invert (&inverse_affine);
+
+ self->inverse_jacobian.coeff[0][0] = inverse_affine.coeff[0][0];
+ self->inverse_jacobian.coeff[0][1] = inverse_affine.coeff[0][1];
+ self->inverse_jacobian.coeff[1][0] = inverse_affine.coeff[1][0];
+ self->inverse_jacobian.coeff[1][1] = inverse_affine.coeff[1][1];
+
+ self->sampler = gegl_buffer_sampler_new (self->buffer_mipmap, format, GEGL_SAMPLER_LINEAR);
+ }
+ }
+
+ g_object_notify (G_OBJECT (self), "buffer");
+
+ g_assert_null (self->lines);
+
+ if (self->cinfo.output_components > 0
+ && self->cinfo.output_width > 0
+ && self->cinfo.output_width > G_MAXUINT / (guint) self->cinfo.output_components)
+ {
+ g_set_error (error,
+ PHOTOS_ERROR,
+ 0,
+ _("Overflow calculating row stride (%u×%u)"),
+ self->cinfo.output_components,
+ self->cinfo.output_width);
+ goto out;
+ }
+
+ self->stride_mipmap = (JDIMENSION) self->cinfo.output_components * self->cinfo.output_width;
+ if (self->stride_mipmap % 2 == 1)
+ self->stride_mipmap++;
+
+ self->lines = self->cinfo.mem->alloc_sarray ((j_common_ptr) &self->cinfo,
+ JPOOL_IMAGE,
+ self->stride_mipmap,
+ (JDIMENSION) self->cinfo.rec_outbuf_height);
+
+ self->scanline = 0;
+ }
+ else if (!self->did_prescan)
+ {
+ gint rc;
+
+ self->cinfo.buffered_image = self->cinfo.progressive_mode;
+ rc = jpeg_start_decompress (&self->cinfo);
+ self->cinfo.do_fancy_upsampling = FALSE;
+ self->cinfo.do_block_smoothing = FALSE;
+
+ if (rc == JPEG_SUSPENDED)
+ continue;
+
+ self->did_prescan = TRUE;
+ }
+ else if (!self->cinfo.buffered_image)
+ {
+ if (!photos_gegl_buffer_codec_jpeg_load_lines (self, error))
+ goto out;
+
+ if (self->cinfo.output_scanline >= self->cinfo.output_height)
+ {
+ ret_val = TRUE;
+ goto out;
+ }
+ }
+ else
+ {
+ while (!jpeg_input_complete (&self->cinfo))
+ {
+ if (!self->in_output)
+ {
+ if (jpeg_start_output (&self->cinfo, self->cinfo.input_scan_number))
+ {
+ self->in_output = TRUE;
+ self->scanline = 0;
+ }
+ else
+ {
+ break;
+ }
+ }
+
+ if (!photos_gegl_buffer_codec_jpeg_load_lines (self, error))
+ goto out;
+
+ if (self->cinfo.output_scanline >= self->cinfo.output_height && jpeg_finish_output
(&self->cinfo))
+ self->in_output = FALSE;
+ else
+ break;
+ }
+
+ if (jpeg_input_complete (&self->cinfo))
+ {
+ ret_val = TRUE;
+ goto out;
+ }
+ else
+ {
+ continue;
+ }
+ }
+ }
+
+ out:
+ return ret_val;
+}
+
+
+static gboolean
+photos_gegl_buffer_codec_jpeg_load_stop (PhotosGeglBufferCodec *codec, GError **error)
+{
+ PhotosGeglBufferCodecJpeg *self = PHOTOS_GEGL_BUFFER_CODEC_JPEG (codec);
+ gboolean ret_val = FALSE;
+
+ g_return_val_if_fail (self->decoding, FALSE);
+
+ self->jerr.error = error;
+
+ if (!sigsetjmp (self->jerr.setjmp_buffer, 1))
+ {
+ if (self->buffer != NULL && self->cinfo.output_scanline < self->cinfo.output_height)
+ {
+ if (self->src.skip_next < sizeof (self->src.buffer) - 2)
+ {
+ self->src.buffer[self->src.skip_next] = (JOCTET) 0xFF;
+ self->src.buffer[self->src.skip_next + 1] = (JOCTET) JPEG_EOI;
+ self->src.pub.next_input_byte = &self->src.buffer[self->src.skip_next];
+ self->src.pub.bytes_in_buffer = 2;
+
+ photos_gegl_buffer_codec_jpeg_load_lines (self, NULL);
+ }
+ }
+ }
+
+ /* FIXME: This thing needs to report errors if we have unused image
+ * data.
+ */
+
+ self->jerr.error = error;
+
+ if (sigsetjmp (self->jerr.setjmp_buffer, 1))
+ {
+ ret_val = FALSE;
+ }
+ else
+ {
+ jpeg_finish_decompress (&self->cinfo);
+ ret_val = TRUE;
+ }
+
+ jpeg_destroy_decompress (&self->cinfo);
+ self->decoding = FALSE;
+
+ g_return_val_if_fail (!self->decoding, FALSE);
+
+ return ret_val;
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_dispose (GObject *object)
+{
+ PhotosGeglBufferCodecJpeg *self = PHOTOS_GEGL_BUFFER_CODEC_JPEG (object);
+
+ g_clear_object (&self->buffer);
+ g_clear_object (&self->buffer_mipmap);
+ g_clear_object (&self->sampler);
+
+ G_OBJECT_CLASS (photos_gegl_buffer_codec_jpeg_parent_class)->dispose (object);
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_finalize (GObject *object)
+{
+ PhotosGeglBufferCodecJpeg *self = PHOTOS_GEGL_BUFFER_CODEC_JPEG (object);
+
+ if (self->decoding)
+ jpeg_destroy_decompress (&self->cinfo);
+
+ g_free (self->tile_memory);
+
+ G_OBJECT_CLASS (photos_gegl_buffer_codec_jpeg_parent_class)->finalize (object);
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+ PhotosGeglBufferCodecJpeg *self = PHOTOS_GEGL_BUFFER_CODEC_JPEG (object);
+
+ switch (prop_id)
+ {
+ case PROP_BUFFER:
+ g_value_set_object (value, self->buffer);
+ break;
+
+ case PROP_CAN_SET_SIZE:
+ g_value_set_boolean (value, self->can_set_size);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_init (PhotosGeglBufferCodecJpeg *self)
+{
+}
+
+
+static void
+photos_gegl_buffer_codec_jpeg_class_init (PhotosGeglBufferCodecJpegClass *class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+ PhotosGeglBufferCodecClass *buffer_codec_class = PHOTOS_GEGL_BUFFER_CODEC_CLASS (class);
+
+ buffer_codec_class->mime_types = (GStrv) MIME_TYPES;
+
+ object_class->dispose = photos_gegl_buffer_codec_jpeg_dispose;
+ object_class->finalize = photos_gegl_buffer_codec_jpeg_finalize;
+ object_class->get_property = photos_gegl_buffer_codec_jpeg_get_property;
+ buffer_codec_class->get_buffer = photos_gegl_buffer_codec_jpeg_get_buffer;
+ buffer_codec_class->load_begin = photos_gegl_buffer_codec_jpeg_load_begin;
+ buffer_codec_class->load_increment = photos_gegl_buffer_codec_jpeg_load_increment;
+ buffer_codec_class->load_stop = photos_gegl_buffer_codec_jpeg_load_stop;
+
+ g_object_class_override_property (object_class, PROP_BUFFER, "buffer");
+ g_object_class_override_property (object_class, PROP_CAN_SET_SIZE, "can-set-size");
+}
diff --git a/src/photos-gegl-buffer-codec-jpeg.h b/src/photos-gegl-buffer-codec-jpeg.h
new file mode 100644
index 00000000..6d9b5618
--- /dev/null
+++ b/src/photos-gegl-buffer-codec-jpeg.h
@@ -0,0 +1,39 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2018 Red Hat, Inc.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on code from:
+ * + GdkPixbuf
+ */
+
+#ifndef PHOTOS_GEGL_BUFFER_CODEC_JPEG_H
+#define PHOTOS_GEGL_BUFFER_CODEC_JPEG_H
+
+#include "photos-gegl-buffer-codec.h"
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_GEGL_BUFFER_CODEC_JPEG (photos_gegl_buffer_codec_jpeg_get_type ())
+G_DECLARE_FINAL_TYPE (PhotosGeglBufferCodecJpeg,
+ photos_gegl_buffer_codec_jpeg,
+ PHOTOS,
+ GEGL_BUFFER_CODEC_JPEG,
+ PhotosGeglBufferCodec);
+
+G_END_DECLS
+
+#endif /* PHOTOS_GEGL_BUFFER_CODEC_JPEG_H */
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