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[hb-view] Support iTerm2 inline images protocol 

https://github.com/harfbuzz/harfbuzz/issues/2758
This commit is contained in:
Khaled Hosny 2021-03-21 18:16:33 +02:00 committed by Behdad Esfahbod
parent 743baf3543
commit f7d5889b3e
1 changed files with 78 additions and 7 deletions
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85
util/helper-cairo.cc
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@ -175,11 +175,17 @@ helper_cairo_scaled_font_has_color (cairo_scaled_font_t *scaled_font)
}
enum class image_protocol_t {
NONE = 0,
ITERM2,
};
struct finalize_closure_t {
void (*callback)(finalize_closure_t *);
cairo_surface_t *surface;
cairo_write_func_t write_func;
void *closure;
image_protocol_t protocol;
};
static cairo_user_data_key_t finalize_closure_key;
@ -201,7 +207,8 @@ _cairo_ansi_surface_create_for_stream (cairo_write_func_t write_func,
void *closure,
double width,
double height,
cairo_content_t content)
cairo_content_t content,
image_protocol_t protocol HB_UNUSED)
{
cairo_surface_t *surface;
int w = ceil (width);
@ -242,16 +249,61 @@ _cairo_ansi_surface_create_for_stream (cairo_write_func_t write_func,
#ifdef CAIRO_HAS_PNG_FUNCTIONS
static cairo_status_t
byte_array_write_func (void *closure,
const unsigned char *data,
unsigned int size)
{
g_byte_array_append ((GByteArray *) closure, data, size);
return CAIRO_STATUS_SUCCESS;
}
static void
finalize_png (finalize_closure_t *closure)
{
cairo_status_t status;
status = cairo_surface_write_to_png_stream (closure->surface,
closure->write_func,
closure->closure);
GByteArray *bytes;
GString *string;
gchar *base64;
size_t base64_len;
if (closure->protocol == image_protocol_t::NONE)
{
status = cairo_surface_write_to_png_stream (closure->surface,
closure->write_func,
closure->closure);
}
else
{
bytes = g_byte_array_new ();
status = cairo_surface_write_to_png_stream (closure->surface,
byte_array_write_func,
bytes);
}
if (status != CAIRO_STATUS_SUCCESS)
fail (false, "Failed to write output: %s",
cairo_status_to_string (status));
if (closure->protocol == image_protocol_t::NONE)
return;
base64 = g_base64_encode (bytes->data, bytes->len);
base64_len = strlen (base64);
string = g_string_new (NULL);
if (closure->protocol == image_protocol_t::ITERM2)
{
/* https://iterm2.com/documentation-images.html */
g_string_printf (string, "\033]1337;File=inline=1;size=%zu:%s\a\n",
base64_len, base64);
}
closure->write_func (closure->closure, (unsigned char *) string->str, string->len);
g_byte_array_unref (bytes);
g_free (base64);
g_string_free (string, TRUE);
}
static cairo_surface_t *
@ -259,7 +311,8 @@ _cairo_png_surface_create_for_stream (cairo_write_func_t write_func,
void *closure,
double width,
double height,
cairo_content_t content)
cairo_content_t content,
image_protocol_t protocol)
{
cairo_surface_t *surface;
int w = ceil (width);
@ -287,6 +340,7 @@ _cairo_png_surface_create_for_stream (cairo_write_func_t write_func,
png_closure->surface = surface;
png_closure->write_func = write_func;
png_closure->closure = closure;
png_closure->protocol = protocol;
if (cairo_surface_set_user_data (surface,
&finalize_closure_key,
@ -352,13 +406,30 @@ helper_cairo_create_context (double w, double h,
void *closure,
double width,
double height,
cairo_content_t content) = nullptr;
cairo_content_t content,
image_protocol_t protocol) = nullptr;
image_protocol_t protocol = image_protocol_t::NONE;
const char *extension = out_opts->output_format;
if (!extension) {
#if HAVE_ISATTY
if (isatty (fileno (out_opts->get_file_handle ())))
{
#ifdef CAIRO_HAS_PNG_FUNCTIONS
const char *name;
/* https://gitlab.com/gnachman/iterm2/-/issues/7154 */
if ((name = getenv ("LC_TERMINAL")) != nullptr &&
0 == g_ascii_strcasecmp (name, "iTerm2"))
{
extension = "png";
protocol = image_protocol_t::ITERM2;
}
else
extension = "ansi";
#else
extension = "ansi";
#endif
}
else
#endif
{
@ -419,7 +490,7 @@ helper_cairo_create_context (double w, double h,
if (constructor)
surface = constructor (stdio_write_func, f, w, h);
else if (constructor2)
surface = constructor2 (stdio_write_func, f, w, h, content);
surface = constructor2 (stdio_write_func, f, w, h, content, protocol);
else
fail (false, "Unknown output format `%s'; supported formats are: %s%s",
extension,