Use spng to load thumbnails
Speed matters here, and this makes us about 20 percent faster at loading large directories. Moreover, libpng's PNG_ALPHA_BROKEN is indeed broken. Thumbnails have a fairly fixed format, so there are very few practical corner cases that could have been missed.
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@ -18,7 +18,7 @@ a package with the latest development version from Archlinux's AUR.
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Building and Running
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--------------------
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Build dependencies: Meson, pkg-config +
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Runtime dependencies: gtk+-3.0, pixman-1, shared-mime-info, libpng>=1.5.4,
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Runtime dependencies: gtk+-3.0, pixman-1, shared-mime-info, spng>=0.7.0,
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libturbojpeg, LibRaw (optional), librsvg-2.0 (optional),
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gdk-pixbuf-2.0 (optional)
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217
fastiv-io.c
217
fastiv-io.c
@ -603,53 +603,48 @@ fastiv_io_open_from_data(const char *data, size_t len, const gchar *path,
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// NOTE: "It is important to note that when an image with an alpha channel is
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// scaled, linear encoded, pre-multiplied component values must be used!"
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#include <glib/gstdio.h>
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#include <png.h>
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#include <spng.h>
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static void
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redirect_png_error(png_structp pngp, const char *error)
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{
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set_error(png_get_error_ptr(pngp), error);
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png_longjmp(pngp, 1);
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}
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static void
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discard_png_warning(png_structp pngp, const char *warning)
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{
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(void) pngp;
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(void) warning;
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}
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static int
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check_png_thumbnail(
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png_structp pngp, png_infop infop, const gchar *target, time_t mtime)
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static int // tri-state
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check_spng_thumbnail_texts(struct spng_text *texts, uint32_t texts_len,
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const gchar *target, time_t mtime)
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{
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// May contain Thumb::Image::Width Thumb::Image::Height,
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// but those aren't interesting currently (would be for fast previews).
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int texts_len = 0;
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png_textp texts = NULL;
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png_get_text(pngp, infop, &texts, &texts_len);
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gboolean need_uri = TRUE, need_mtime = TRUE;
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for (int i = 0; i < texts_len; i++) {
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png_textp text = texts + i;
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if (!strcmp(text->key, "Thumb::URI")) {
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need_uri = FALSE;
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bool need_uri = true, need_mtime = true;
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for (uint32_t i = 0; i < texts_len; i++) {
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struct spng_text *text = texts + i;
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if (!strcmp(text->keyword, "Thumb::URI")) {
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need_uri = false;
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if (strcmp(target, text->text))
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return FALSE;
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return false;
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}
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if (!strcmp(text->key, "Thumb::MTime")) {
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need_mtime = FALSE;
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if (!strcmp(text->keyword, "Thumb::MTime")) {
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need_mtime = false;
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if (atol(text->text) != mtime)
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return FALSE;
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return false;
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}
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}
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return need_uri || need_mtime ? -1 : TRUE;
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return need_uri || need_mtime ? -1 : true;
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}
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static int // tri-state
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check_spng_thumbnail(spng_ctx *ctx, const gchar *target, time_t mtime, int *err)
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{
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uint32_t texts_len = 0;
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if ((*err = spng_get_text(ctx, NULL, &texts_len)))
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return false;
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int result = false;
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struct spng_text *texts = g_malloc0_n(texts_len, sizeof *texts);
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if (!(*err = spng_get_text(ctx, texts, &texts_len)))
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result = check_spng_thumbnail_texts(texts, texts_len, target, mtime);
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g_free(texts);
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return result;
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}
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// TODO(p): Support spng as well (it can't premultiply alpha by itself,
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// but at least it won't gamma-adjust it for us).
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static cairo_surface_t *
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read_png_thumbnail(
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read_spng_thumbnail(
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const gchar *path, const gchar *uri, time_t mtime, GError **error)
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{
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FILE *fp;
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@ -658,96 +653,92 @@ read_png_thumbnail(
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return NULL;
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}
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cairo_surface_t *volatile surface = NULL;
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png_structp pngp = png_create_read_struct(
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PNG_LIBPNG_VER_STRING, error, redirect_png_error, discard_png_warning);
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png_infop infop = png_create_info_struct(pngp);
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if (!infop) {
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cairo_surface_t *result = NULL;
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errno = 0;
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spng_ctx *ctx = spng_ctx_new(0);
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if (!ctx) {
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set_error(error, g_strerror(errno));
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goto fail_preread;
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goto fail_init;
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}
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volatile png_bytepp row_pointers = NULL;
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if (setjmp(png_jmpbuf(pngp))) {
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if (surface) {
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cairo_surface_destroy(surface);
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surface = NULL;
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}
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int err;
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size_t size = 0;
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if ((err = spng_set_png_file(ctx, fp)) ||
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(err = spng_set_image_limits(ctx, INT16_MAX, INT16_MAX)) ||
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(err = spng_decoded_image_size(ctx, SPNG_FMT_RGBA8, &size))) {
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set_error(error, spng_strerror(err));
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goto fail;
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}
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if (check_spng_thumbnail(ctx, uri, mtime, &err) == false) {
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set_error(error, err ? spng_strerror(err) : "mismatch");
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goto fail;
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}
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png_init_io(pngp, fp);
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// XXX: libpng will premultiply with the alpha, but it also gamma-adjust it.
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png_set_alpha_mode(pngp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
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png_read_info(pngp, infop);
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if (check_png_thumbnail(pngp, infop, uri, mtime) == FALSE)
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png_error(pngp, "mismatch");
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// Asking for at least 8-bit channels. This call is a superset of:
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// - png_set_palette_to_rgb(),
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// - png_set_tRNS_to_alpha(),
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// - png_set_expand_gray_1_2_4_to_8().
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png_set_expand(pngp);
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// Reduce the possibilities further to RGB or RGBA...
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png_set_gray_to_rgb(pngp);
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// ...and /exactly/ 8-bit channels.
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// Alternatively, use png_set_expand_16() above to obtain 16-bit channels.
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png_set_scale_16(pngp);
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// PNG uses RGBA order, we want either ARGB (BE) or BGRA (LE).
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if (G_BYTE_ORDER == G_LITTLE_ENDIAN) {
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png_set_bgr(pngp);
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png_set_add_alpha(pngp, 0xFFFF, PNG_FILLER_AFTER);
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png_set_swap(pngp);
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} else {
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// This doesn't change a row's `color_type` in png_do_read_filler(),
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// and the following transformation thus ignores it.
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png_set_add_alpha(pngp, 0xFFFF, PNG_FILLER_BEFORE);
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png_set_swap_alpha(pngp);
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uint32_t *data = g_malloc0(size);
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if ((err = spng_decode_image(ctx, data, size, SPNG_FMT_RGBA8,
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SPNG_DECODE_TRNS | SPNG_DECODE_GAMMA))) {
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set_error(error, spng_strerror(err));
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goto fail_data;
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}
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(void) png_set_interlace_handling(pngp);
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png_read_update_info(pngp, infop);
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png_uint_32 w = png_get_image_width(pngp, infop);
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png_uint_32 h = png_get_image_height(pngp, infop);
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if (w > INT16_MAX || h > INT16_MAX)
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png_error(pngp, "the image is too large");
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surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
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cairo_status_t surface_status = cairo_surface_status(surface);
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if (surface_status != CAIRO_STATUS_SUCCESS)
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png_error(pngp, cairo_status_to_string(surface_status));
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size_t row_bytes = png_get_rowbytes(pngp, infop);
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g_assert((size_t) cairo_image_surface_get_stride(surface) == row_bytes);
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unsigned char *buffer = cairo_image_surface_get_data(surface);
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png_uint_32 height = png_get_image_height(pngp, infop);
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if (!(row_pointers = calloc(height, sizeof *row_pointers)))
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png_error(pngp, g_strerror(errno));
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for (size_t y = 0; y < height; y++)
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row_pointers[y] = buffer + y * row_bytes;
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cairo_surface_flush(surface);
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png_read_image(pngp, row_pointers);
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cairo_surface_mark_dirty(surface);
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// The specification does not say where the required metadata should be,
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// it could very well be broken up into two parts.
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png_read_end(pngp, infop);
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if (check_png_thumbnail(pngp, infop, uri, mtime) != TRUE)
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png_error(pngp, "mismatch or not a thumbnail");
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if (check_spng_thumbnail(ctx, uri, mtime, &err) != true) {
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set_error(
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error, err ? spng_strerror(err) : "mismatch or not a thumbnail");
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goto fail_data;
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}
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struct spng_ihdr ihdr = {};
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spng_get_ihdr(ctx, &ihdr);
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cairo_surface_t *surface = cairo_image_surface_create(
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CAIRO_FORMAT_ARGB32, ihdr.width, ihdr.height);
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cairo_status_t surface_status = cairo_surface_status(surface);
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if (surface_status != CAIRO_STATUS_SUCCESS) {
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set_error(error, cairo_status_to_string(surface_status));
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cairo_surface_destroy(surface);
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goto fail_data;
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}
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g_assert((size_t) cairo_image_surface_get_stride(surface) *
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cairo_image_surface_get_height(surface) == size);
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// pixman can be mildly abused to do this operation, but it won't be faster.
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uint32_t *output = (uint32_t *) cairo_image_surface_get_data(surface);
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cairo_surface_flush(surface);
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struct spng_trns trns = {};
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if (ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA ||
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ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR_ALPHA ||
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!spng_get_trns(ctx, &trns)) {
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for (size_t i = size / sizeof *output; i--; ) {
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uint8_t *unit = (uint8_t *) &data[i],
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a = unit[3],
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b = unit[2] * a / 255,
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g = unit[1] * a / 255,
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r = unit[0] * a / 255;
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output[i] = a << 24 | r << 16 | g << 8 | b;
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}
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} else {
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for (size_t i = size / sizeof *output; i--; ) {
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uint8_t *unit = (uint8_t *) &data[i],
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a = unit[3],
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b = unit[2],
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g = unit[1],
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r = unit[0];
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output[i] = a << 24 | r << 16 | g << 8 | b;
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}
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}
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cairo_surface_mark_dirty((result = surface));
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fail_data:
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free(data);
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fail:
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free(row_pointers);
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fail_preread:
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png_destroy_read_struct(&pngp, &infop, NULL);
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spng_ctx_free(ctx);
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fail_init:
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fclose(fp);
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return surface;
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return result;
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}
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cairo_surface_t *
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@ -772,7 +763,7 @@ fastiv_io_lookup_thumbnail(const gchar *target)
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for (gsize i = 0; !result && i < G_N_ELEMENTS(sizes); i++) {
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gchar *path = g_strdup_printf(
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"%s/thumbnails/%s/%s.png", cache_dir, sizes[i], sum);
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result = read_png_thumbnail(path, uri, st.st_mtim.tv_sec, &error);
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result = read_spng_thumbnail(path, uri, st.st_mtim.tv_sec, &error);
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if (error) {
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g_debug("%s: %s", path, error->message);
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g_clear_error(&error);
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@ -7,7 +7,7 @@ gdkpixbuf = dependency('gdk-pixbuf-2.0', required : get_option('gdk-pixbuf'))
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dependencies = [
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dependency('gtk+-3.0'),
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dependency('libturbojpeg'),
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dependency('libpng', version : '>=1.5.4'),
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dependency('spng', version : '>=0.7.0'),
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dependency('pixman-1'),
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libraw,
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librsvg,
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