remove legacy multi-frame loaders

this removes the legacy gif and webp loaders. moving forward
multi-frame/animated images will be loaded by imlib2 itself.

Closes: https://codeberg.org/nsxiv/nsxiv/issues/397

8 files changed, 9 insertions, 332 deletions

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 97a7c65..6b6af3f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,11 +43,11 @@ jobs:
         run: |
           brew update
           # see: https://github.com/actions/setup-python/issues/577
-          brew install imlib2 libx11 libxft libexif giflib webp || true
+          brew install imlib2 libx11 libxft libexif || true
       - name: build
         run: |
           # libinotify-kqueue isn't available on homebrew
           make clean && make -s OPT_DEP_DEFAULT=1 HAVE_INOTIFY=0
           # force uninstallation with --ignore-dependencies
-          brew uninstall --ignore-dependencies libxft libexif giflib webp
+          brew uninstall --ignore-dependencies libxft libexif
           make clean && make -s OPT_DEP_DEFAULT=0
diff --git a/Makefile b/Makefile
index 3527741..b7ee37b 100644
--- a/Makefile
+++ b/Makefile
@@ -8,20 +8,14 @@ lib_fonts_0 =
 lib_fonts_1 = -lXft -lfontconfig
 lib_exif_0 =
 lib_exif_1 = -lexif
-lib_gif_0 =
-lib_gif_1 = -lgif
-lib_webp_0 =
-lib_webp_1 = -lwebpdemux -lwebp
 
 nsxiv_cppflags = -D_XOPEN_SOURCE=700 \
-  -DHAVE_LIBGIF=$(HAVE_LIBGIF) -DHAVE_LIBEXIF=$(HAVE_LIBEXIF) \
-  -DHAVE_LIBWEBP=$(HAVE_LIBWEBP) -DHAVE_LIBFONTS=$(HAVE_LIBFONTS) \
+  -DHAVE_LIBEXIF=$(HAVE_LIBEXIF) -DHAVE_LIBFONTS=$(HAVE_LIBFONTS) \
   -DHAVE_INOTIFY=$(HAVE_INOTIFY) $(inc_fonts_$(HAVE_LIBFONTS)) \
   $(CPPFLAGS)
 
 nsxiv_ldlibs = -lImlib2 -lX11 \
-  $(lib_exif_$(HAVE_LIBEXIF)) $(lib_gif_$(HAVE_LIBGIF)) \
-  $(lib_webp_$(HAVE_LIBWEBP)) $(lib_fonts_$(HAVE_LIBFONTS)) \
+  $(lib_exif_$(HAVE_LIBEXIF)) $(lib_fonts_$(HAVE_LIBFONTS)) \
   $(LDLIBS)
 
 objs = autoreload.o commands.o image.o main.o options.o \
diff --git a/README.md b/README.md
index 3a3b2d1..9a9c1d4 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Features
 --------
 
 * Basic image operations like zooming, panning, rotating
-* Basic support for animated/multi-frame images
+* Basic support for animated/multi-frame images (**requires Imlib2 v1.8.0 or above**)
 * Thumbnail mode: grid of selectable previews of all images
 * Ability to cache thumbnails for fast re-loading
 * Automatically refreshing modified images
@@ -76,15 +76,6 @@ The following dependencies are optional:
   * `libexif`: Used for auto-orientation and exif thumbnails.
     Disable via `HAVE_LIBEXIF=0`.
 
-The following dependencies are only used if your imlib2 version is lower than
-v1.8.0. If your imlib2 version is v1.8.0 (or above) then the following
-dependencies are unused and won't be built (even if you enable it explicitly).
-
-  * `giflib`: Used for animated gif playback.  Disabled via `HAVE_LIBGIF=0`.
-  * `libwebp`: Used for animated webp playback.
-    (***NOTE***: animated webp also requires Imlib2 v1.7.5 or above)
-    Disabled via `HAVE_LIBWEBP=0`.
-
 Please make sure to install the corresponding development packages in case that
 you want to build nsxiv on a distribution with separate runtime and development
 packages (e.g. \*-dev on Debian).
diff --git a/config.mk b/config.mk
index fb28086..b1faec6 100644
--- a/config.mk
+++ b/config.mk
@@ -16,11 +16,6 @@ HAVE_INOTIFY = $(OPT_DEP_DEFAULT)
 HAVE_LIBFONTS = $(OPT_DEP_DEFAULT)
 HAVE_LIBEXIF  = $(OPT_DEP_DEFAULT)
 
-# unused if imlib2 version is 1.8.0 or higher.
-# these options will be removed eventually.
-HAVE_LIBGIF   = $(OPT_DEP_DEFAULT)
-HAVE_LIBWEBP  = $(OPT_DEP_DEFAULT)
-
 # CFLAGS, any additional compiler flags goes here
 CFLAGS = -Wall -pedantic -O2 -DNDEBUG
 # Uncomment for a debug build using gcc/clang
diff --git a/etc/woodpecker/analysis.yml b/etc/woodpecker/analysis.yml
index 9ebcc4f..b08dc36 100644
--- a/etc/woodpecker/analysis.yml
+++ b/etc/woodpecker/analysis.yml
@@ -6,6 +6,6 @@ pipeline:
     commands: |
       apk add --no-cache build-base cppcheck clang-extra-tools git \
           imlib2-dev xorgproto \
-          libxft-dev libexif-dev giflib-dev libwebp-dev >/dev/null
+          libxft-dev libexif-dev >/dev/null
       make config.h version.h
       ./etc/woodpecker/analysis.sh
diff --git a/etc/woodpecker/build.yml b/etc/woodpecker/build.yml
index 7c79a90..1f447a3 100644
--- a/etc/woodpecker/build.yml
+++ b/etc/woodpecker/build.yml
@@ -9,7 +9,7 @@ pipeline:
     commands: |
       apk add --no-cache \
           imlib2 imlib2-dev xorgproto \
-          libxft libxft-dev libexif libexif-dev giflib giflib-dev libwebp libwebp-dev \
+          libxft libxft-dev libexif libexif-dev \
           gcc clang llvm llvm-dev build-base wget ca-certificates bc >/dev/null
       wget "https://github.com/TinyCC/tinycc/archive/$TCC_SHA.tar.gz" >/dev/null
       tar xzf "$TCC_SHA.tar.gz" >/dev/null
@@ -26,5 +26,5 @@ pipeline:
       # full-build with gcc and clang #
       build "1" "full"
       # ensure minimal-build works without opt deps installed
-      apk del libxft libxft-dev libexif libexif-dev giflib giflib-dev libwebp libwebp-dev >/dev/null
+      apk del libxft libxft-dev libexif libexif-dev >/dev/null
       build "0" "minimal"
diff --git a/image.c b/image.c
index 6020e93..2a01954 100644
--- a/image.c
+++ b/image.c
@@ -33,18 +33,6 @@
 #include <libexif/exif-data.h>
 #endif
 
-#if HAVE_LIBGIF && !HAVE_IMLIB2_MULTI_FRAME
-#include <gif_lib.h>
-enum { DEF_GIF_DELAY = 75 };
-#endif
-
-#if HAVE_LIBWEBP && !HAVE_IMLIB2_MULTI_FRAME
-#include <stdio.h>
-#include <webp/decode.h>
-#include <webp/demux.h>
-enum { DEF_WEBP_DELAY = 75 };
-#endif
-
 #if HAVE_IMLIB2_MULTI_FRAME
 enum { DEF_ANIM_DELAY = 75 };
 #endif
@@ -144,7 +132,7 @@ void exif_auto_orientate(const fileinfo_t *file)
 }
 #endif
 
-#if HAVE_LIBGIF || HAVE_LIBWEBP || HAVE_IMLIB2_MULTI_FRAME
+#if HAVE_IMLIB2_MULTI_FRAME
 static void img_multiframe_context_set(img_t *img)
 {
 	if (img->multi.cnt > 1) {
@@ -157,283 +145,7 @@ static void img_multiframe_context_set(img_t *img)
 
 	imlib_context_set_image(img->im);
 }
-#endif
-
-#if (HAVE_LIBGIF || HAVE_LIBWEBP) && !HAVE_IMLIB2_MULTI_FRAME
-static void img_multiframe_deprecation_notice(void)
-{
-	static bool warned;
-	if (!warned) {
-		error(0, 0, "\n"
-		      "################################################################\n"
-		      "#                      DEPRECATION NOTICE                      #\n"
-		      "################################################################\n"
-		      "# Internal multi-frame gif and webp loaders are deprecated and #\n"
-		      "# will be removed soon. Please upgrade to Imlib2 v1.8.0 for    #\n"
-		      "# multi-frame/animated image support.                          #\n"
-		      "################################################################");
-		warned = true;
-	}
-}
-#endif
-
-#if HAVE_LIBGIF && !HAVE_IMLIB2_MULTI_FRAME
-static bool img_load_gif(img_t *img, const fileinfo_t *file)
-{
-	GifFileType *gif;
-	GifRowType *rows = NULL;
-	GifRecordType rec;
-	ColorMapObject *cmap;
-	uint32_t bgpixel = 0, *data, *ptr;
-	uint32_t *prev_frame = NULL;
-	Imlib_Image im;
-	int i, j, bg, r, g, b;
-	int x, y, w, h, sw, sh;
-	int px, py, pw, ph;
-	int intoffset[] = { 0, 4, 2, 1 };
-	int intjump[] = { 8, 8, 4, 2 };
-	int transp = -1;
-	unsigned int disposal = 0, prev_disposal = 0;
-	unsigned int delay = 0;
-	bool err = false;
-	multi_img_t *m = &img->multi;
-
-	img_multiframe_deprecation_notice();
-
-#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
-	gif = DGifOpenFileName(file->path, NULL);
-#else
-	gif = DGifOpenFileName(file->path);
-#endif
-	if (gif == NULL) {
-		error(0, 0, "%s: Error opening gif image", file->name);
-		return false;
-	}
-	bg = gif->SBackGroundColor;
-	sw = gif->SWidth;
-	sh = gif->SHeight;
-	px = py = pw = ph = 0;
-
-	m->length = m->cnt = m->sel = 0;
-	do {
-		if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
-			err = true;
-			break;
-		}
-		if (rec == EXTENSION_RECORD_TYPE) {
-			int ext_code;
-			GifByteType *ext = NULL;
-
-			DGifGetExtension(gif, &ext_code, &ext);
-			while (ext) {
-				if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
-					if (ext[1] & 1)
-						transp = (int)ext[4];
-					else
-						transp = -1;
-
-					delay = 10 * ((unsigned int)ext[3] << 8 | (unsigned int)ext[2]);
-					disposal = (unsigned int)ext[1] >> 2 & 0x7;
-				}
-				ext = NULL;
-				DGifGetExtensionNext(gif, &ext);
-			}
-		} else if (rec == IMAGE_DESC_RECORD_TYPE) {
-			if (DGifGetImageDesc(gif) == GIF_ERROR) {
-				err = true;
-				break;
-			}
-			x = gif->Image.Left;
-			y = gif->Image.Top;
-			w = gif->Image.Width;
-			h = gif->Image.Height;
-
-			rows = emalloc(h * sizeof(*rows));
-			for (i = 0; i < h; i++)
-				rows[i] = emalloc(w * sizeof(*rows[i]));
-			if (gif->Image.Interlace) {
-				for (i = 0; i < 4; i++) {
-					for (j = intoffset[i]; j < h; j += intjump[i])
-						DGifGetLine(gif, rows[j], w);
-				}
-			} else {
-				for (i = 0; i < h; i++)
-					DGifGetLine(gif, rows[i], w);
-			}
-
-			ptr = data = emalloc(sw * sh * sizeof(*data));
-			cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
-			/* if bg > cmap->ColorCount, it is transparent black already */
-			if (cmap && bg >= 0 && bg < cmap->ColorCount) {
-				r = cmap->Colors[bg].Red;
-				g = cmap->Colors[bg].Green;
-				b = cmap->Colors[bg].Blue;
-				bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
-			}
-
-			for (i = 0; i < sh; i++) {
-				for (j = 0; j < sw; j++) {
-					if (i < y || i >= y + h || j < x || j >= x + w ||
-					    rows[i - y][j - x] == transp)
-					{
-						if (prev_frame != NULL &&
-						    (prev_disposal != 2 || i < py || i >= py + ph ||
-						     j < px || j >= px + pw))
-						{
-							*ptr = prev_frame[i * sw + j];
-						} else {
-							*ptr = bgpixel;
-						}
-					} else {
-						assert(cmap != NULL);
-						r = cmap->Colors[rows[i - y][j - x]].Red;
-						g = cmap->Colors[rows[i - y][j - x]].Green;
-						b = cmap->Colors[rows[i - y][j - x]].Blue;
-						*ptr = 0xffu << 24 | r << 16 | g << 8 | b;
-					}
-					ptr++;
-				}
-			}
-
-			im = imlib_create_image_using_copied_data(sw, sh, data);
-
-			for (i = 0; i < h; i++)
-				free(rows[i]);
-			free(rows);
-			free(data);
-
-			if (im == NULL) {
-				err = true;
-				break;
-			}
-
-			imlib_context_set_image(im);
-			imlib_image_set_format("gif");
-			if (transp >= 0)
-				imlib_image_set_has_alpha(1);
-
-			if (disposal != 3)
-				prev_frame = imlib_image_get_data_for_reading_only();
-			prev_disposal = disposal;
-			px = x, py = y, pw = w, ph = h;
-
-			assert(m->cnt <= m->cap);
-			if (m->cnt == m->cap) {
-				m->cap = m->cap == 0 ? 16 : (m->cap * 2);
-				m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
-			}
-			m->frames[m->cnt].im = im;
-			delay = m->framedelay > 0 ? m->framedelay : delay;
-			m->frames[m->cnt].delay = delay > 0 ? delay : DEF_GIF_DELAY;
-			m->length += m->frames[m->cnt].delay;
-			m->cnt++;
-		}
-	} while (rec != TERMINATE_RECORD_TYPE);
-
-#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
-	DGifCloseFile(gif, NULL);
-#else
-	DGifCloseFile(gif);
-#endif
-
-	if (err && (file->flags & FF_WARN))
-		error(0, 0, "%s: Corrupted gif file", file->name);
-
-	img_multiframe_context_set(img);
-
-	return !err;
-}
-#endif /* HAVE_LIBGIF */
-
-#if HAVE_LIBWEBP && !HAVE_IMLIB2_MULTI_FRAME
-static bool img_load_webp(img_t *img, const fileinfo_t *file)
-{
-	FILE *webp_file;
-	WebPData data;
-	Imlib_Image im = NULL;
-	struct WebPAnimDecoderOptions opts;
-	WebPAnimDecoder *dec = NULL;
-	struct WebPAnimInfo info;
-	unsigned char *buf = NULL, *bytes = NULL;
-	int ts;
-	const WebPDemuxer *demux;
-	WebPIterator iter;
-	unsigned long flags;
-	unsigned int delay;
-	bool err = false;
-	multi_img_t *m = &img->multi;
-
-	img_multiframe_deprecation_notice();
 
-	if ((webp_file = fopen(file->path, "rb")) == NULL) {
-		error(0, errno, "%s: Error opening webp image", file->name);
-		return false;
-	}
-	fseek(webp_file, 0L, SEEK_END);
-	data.size = ftell(webp_file);
-	rewind(webp_file);
-	bytes = emalloc(data.size);
-	if ((err = fread(bytes, 1, data.size, webp_file) != data.size)) {
-		error(0, 0, "%s: Error reading webp image", file->name);
-		goto fail;
-	}
-	data.bytes = bytes;
-
-	/* Setup the WebP Animation Decoder */
-	if ((err = !WebPAnimDecoderOptionsInit(&opts))) {
-		error(0, 0, "%s: WebP library version mismatch", file->name);
-		goto fail;
-	}
-	opts.color_mode = MODE_BGRA;
-	/* NOTE: Multi-threaded decoding may cause problems on some system */
-	opts.use_threads = true;
-	dec = WebPAnimDecoderNew(&data, &opts);
-	if ((err = (dec == NULL) || !WebPAnimDecoderGetInfo(dec, &info))) {
-		error(0, 0, "%s: WebP parsing or memory error (file is corrupt?)", file->name);
-		goto fail;
-	}
-	demux = WebPAnimDecoderGetDemuxer(dec);
-
-	/* Get global information for the image */
-	flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);
-	img->w = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
-	img->h = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
-
-	if (info.frame_count > m->cap) {
-		m->cap = info.frame_count;
-		m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
-	}
-
-	/* Load and decode frames (also works on images with only 1 frame) */
-	m->length = m->cnt = m->sel = 0;
-	while (WebPAnimDecoderGetNext(dec, &buf, &ts)) {
-		im = imlib_create_image_using_copied_data(info.canvas_width, info.canvas_height,
-		                                          (uint32_t *)buf);
-		imlib_context_set_image(im);
-		imlib_image_set_format("webp");
-		/* Get an iterator of this frame - used for frame info (duration, etc.) */
-		WebPDemuxGetFrame(demux, m->cnt + 1, &iter);
-		imlib_image_set_has_alpha((flags & ALPHA_FLAG) == ALPHA_FLAG);
-		/* Store info for this frame */
-		m->frames[m->cnt].im = im;
-		delay = iter.duration > 0 ? iter.duration : DEF_WEBP_DELAY;
-		m->frames[m->cnt].delay = delay;
-		m->length += m->frames[m->cnt].delay;
-		m->cnt++;
-	}
-	WebPDemuxReleaseIterator(&iter);
-
-	img_multiframe_context_set(img);
-fail:
-	if (dec != NULL)
-		WebPAnimDecoderDelete(dec);
-	free(bytes);
-	fclose(webp_file);
-	return !err;
-}
-#endif /* HAVE_LIBWEBP */
-
-#if HAVE_IMLIB2_MULTI_FRAME
 static void img_area_clear(int x, int y, int w, int h)
 {
 	assert(x >= 0 && y >= 0);
@@ -596,14 +308,6 @@ bool img_load(img_t *img, const fileinfo_t *file)
 #endif
 
 	if ((fmt = imlib_image_format()) != NULL) { /* NOLINT: fmt might be unused, not worth fixing */
-#if HAVE_LIBGIF && !HAVE_IMLIB2_MULTI_FRAME
-		if (STREQ(fmt, "gif"))
-			img_load_gif(img, file);
-#endif
-#if HAVE_LIBWEBP && !HAVE_IMLIB2_MULTI_FRAME
-		if (STREQ(fmt, "webp"))
-			img_load_webp(img, file);
-#endif
 #if HAVE_LIBEXIF && defined(IMLIB2_VERSION)
 		if (!STREQ(fmt, "jpeg") && !STREQ(fmt, "jpg"))
 			exif_auto_orientate(file);
diff --git a/options.c b/options.c
index 2835967..4ae2ea5 100644
--- a/options.c
+++ b/options.c
@@ -62,13 +62,6 @@ static void print_version(void)
 #endif
 #if HAVE_IMLIB2_MULTI_FRAME
 		"+multiframe "
-#else
-	#if HAVE_LIBGIF
-		"+giflib "
-	#endif
-	#if HAVE_LIBWEBP
-		"+libwebp "
-	#endif
 #endif
 		"\n", stdout);
 }