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Make truncated WebP parts always transparent

This commit is contained in:
Přemysl Eric Janouch 2022-01-23 00:26:22 +01:00
parent c85de6b20f
commit b71d5dff57
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 22 additions and 5 deletions
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25
fiv-io.c
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@ -1281,18 +1281,35 @@ load_libwebp_nonanimated(WebPDecoderConfig *config, const WebPData *wd,
} }
VP8StatusCode err = WebPIUpdate(idec, wd->bytes, wd->size); VP8StatusCode err = WebPIUpdate(idec, wd->bytes, wd->size);
cairo_surface_mark_dirty(surface);
int x = 0, y = 0, w = 0, h = 0;
(void) WebPIDecodedArea(idec, &x, &y, &w, &h);
WebPIDelete(idec); WebPIDelete(idec);
if (err == VP8_STATUS_SUSPENDED) { if (err == VP8_STATUS_OK)
g_warning("partial WebP"); return surface;
} else if (err) {
if (err != VP8_STATUS_SUSPENDED) {
g_set_error(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN, "%s: %s", g_set_error(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN, "%s: %s",
"WebP decoding error", load_libwebp_error(err)); "WebP decoding error", load_libwebp_error(err));
cairo_surface_destroy(surface); cairo_surface_destroy(surface);
return NULL; return NULL;
} }
cairo_surface_mark_dirty(surface); g_warning("partial WebP");
if (config->input.has_alpha)
return surface; return surface;
// Always use transparent black, rather than opaque black.
cairo_surface_t *masked = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32, config->input.width, config->input.height);
cairo_t *cr = cairo_create(masked);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_rectangle(cr, x, y, w, h);
cairo_clip(cr);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return masked;
} }
static cairo_surface_t * static cairo_surface_t *