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gecko-dev/gfx/cairo/disable-subpixel-antialiasi...

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# HG changeset patch
# User Robert O'Callahan <robert@ocallahan.org>
# Date 1294019288 -46800
# Node ID 8857392e37aea7475ed6d8ee4b45023e1233bcec
# Parent c53f60831c43cca397dfed8adf8d350aeec7d3ca
Bug 363861. Part 2: Introduce cairo_surface_get/set_subpixel_antialiasing. r=jrmuizel,sr=vlad,a=blocking
diff --git a/gfx/cairo/cairo/src/cairo-quartz-surface.c b/gfx/cairo/cairo/src/cairo-quartz-surface.c
--- a/gfx/cairo/cairo/src/cairo-quartz-surface.c
+++ b/gfx/cairo/cairo/src/cairo-quartz-surface.c
@@ -2473,16 +2473,17 @@ _cairo_quartz_surface_show_glyphs (void
cairo_int_status_t rv = CAIRO_STATUS_SUCCESS;
cairo_quartz_drawing_state_t state;
float xprev, yprev;
int i;
CGFontRef cgfref = NULL;
cairo_bool_t isClipping = FALSE;
cairo_bool_t didForceFontSmoothing = FALSE;
+ cairo_antialias_t effective_antialiasing;
if (IS_EMPTY(surface))
return CAIRO_STATUS_SUCCESS;
if (num_glyphs <= 0)
return CAIRO_STATUS_SUCCESS;
if (cairo_scaled_font_get_type (scaled_font) != CAIRO_FONT_TYPE_QUARTZ)
@@ -2514,16 +2515,22 @@ _cairo_quartz_surface_show_glyphs (void
goto BAIL;
}
/* this doesn't addref */
cgfref = _cairo_quartz_scaled_font_get_cg_font_ref (scaled_font);
CGContextSetFont (state.context, cgfref);
CGContextSetFontSize (state.context, 1.0);
+ effective_antialiasing = scaled_font->options.antialias;
+ if (effective_antialiasing == CAIRO_ANTIALIAS_SUBPIXEL &&
+ !surface->base.permit_subpixel_antialiasing) {
+ effective_antialiasing = CAIRO_ANTIALIAS_GRAY;
+ }
+
switch (scaled_font->options.antialias) {
case CAIRO_ANTIALIAS_SUBPIXEL:
CGContextSetShouldAntialias (state.context, TRUE);
CGContextSetShouldSmoothFonts (state.context, TRUE);
if (CGContextSetAllowsFontSmoothingPtr &&
!CGContextGetAllowsFontSmoothingPtr (state.context))
{
didForceFontSmoothing = TRUE;
diff --git a/gfx/cairo/cairo/src/cairo-surface-private.h b/gfx/cairo/cairo/src/cairo-surface-private.h
--- a/gfx/cairo/cairo/src/cairo-surface-private.h
+++ b/gfx/cairo/cairo/src/cairo-surface-private.h
@@ -58,16 +58,17 @@ struct _cairo_surface {
cairo_reference_count_t ref_count;
cairo_status_t status;
unsigned int unique_id;
unsigned finished : 1;
unsigned is_clear : 1;
unsigned has_font_options : 1;
+ unsigned permit_subpixel_antialiasing : 1;
cairo_user_data_array_t user_data;
cairo_user_data_array_t mime_data;
cairo_matrix_t device_transform;
cairo_matrix_t device_transform_inverse;
/* The actual resolution of the device, in dots per inch. */
diff --git a/gfx/cairo/cairo/src/cairo-surface.c b/gfx/cairo/cairo/src/cairo-surface.c
--- a/gfx/cairo/cairo/src/cairo-surface.c
+++ b/gfx/cairo/cairo/src/cairo-surface.c
@@ -49,17 +49,18 @@ const cairo_surface_t name = { \
NULL, /* backend */ \
CAIRO_SURFACE_TYPE_IMAGE, /* type */ \
CAIRO_CONTENT_COLOR, /* content */ \
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ \
status, /* status */ \
0, /* unique id */ \
FALSE, /* finished */ \
TRUE, /* is_clear */ \
- FALSE, /* has_font_options */ \
+ FALSE, /* has_font_options */ \
+ FALSE, /* permit_subpixel_antialiasing */ \
{ 0, 0, 0, NULL, }, /* user_data */ \
{ 0, 0, 0, NULL, }, /* mime_data */ \
{ 1.0, 0.0, 0.0, 1.0, 0.0, 0.0 }, /* device_transform */ \
{ 1.0, 0.0, 0.0, 1.0, 0.0, 0.0 }, /* device_transform_inverse */ \
0.0, /* x_resolution */ \
0.0, /* y_resolution */ \
0.0, /* x_fallback_resolution */ \
0.0, /* y_fallback_resolution */ \
@@ -342,46 +343,48 @@ _cairo_surface_init (cairo_surface_t *
surface->content = content;
surface->type = backend->type;
CAIRO_REFERENCE_COUNT_INIT (&surface->ref_count, 1);
surface->status = CAIRO_STATUS_SUCCESS;
surface->unique_id = _cairo_surface_allocate_unique_id ();
surface->finished = FALSE;
surface->is_clear = FALSE;
+ surface->has_font_options = FALSE;
+ surface->permit_subpixel_antialiasing = TRUE;
_cairo_user_data_array_init (&surface->user_data);
_cairo_user_data_array_init (&surface->mime_data);
cairo_matrix_init_identity (&surface->device_transform);
cairo_matrix_init_identity (&surface->device_transform_inverse);
surface->x_resolution = CAIRO_SURFACE_RESOLUTION_DEFAULT;
surface->y_resolution = CAIRO_SURFACE_RESOLUTION_DEFAULT;
surface->x_fallback_resolution = CAIRO_SURFACE_FALLBACK_RESOLUTION_DEFAULT;
surface->y_fallback_resolution = CAIRO_SURFACE_FALLBACK_RESOLUTION_DEFAULT;
_cairo_array_init (&surface->snapshots, sizeof (cairo_surface_t *));
surface->snapshot_of = NULL;
-
- surface->has_font_options = FALSE;
}
static void
_cairo_surface_copy_similar_properties (cairo_surface_t *surface,
cairo_surface_t *other)
{
if (other->has_font_options || other->backend != surface->backend) {
cairo_font_options_t options;
cairo_surface_get_font_options (other, &options);
_cairo_surface_set_font_options (surface, &options);
}
+ surface->permit_subpixel_antialiasing = other->permit_subpixel_antialiasing;
+
cairo_surface_set_fallback_resolution (surface,
other->x_fallback_resolution,
other->y_fallback_resolution);
}
cairo_surface_t *
_cairo_surface_create_similar_scratch (cairo_surface_t *other,
cairo_content_t content,
@@ -2482,16 +2485,67 @@ cairo_surface_has_show_text_glyphs (cair
if (surface->backend->has_show_text_glyphs)
return surface->backend->has_show_text_glyphs (surface);
else
return surface->backend->show_text_glyphs != NULL;
}
slim_hidden_def (cairo_surface_has_show_text_glyphs);
+/**
+ * cairo_surface_set_subpixel_antialiasing:
+ * @surface: a #cairo_surface_t
+ *
+ * Sets whether the surface permits subpixel antialiasing. By default,
+ * surfaces permit subpixel antialiasing.
+ *
+ * Enabling subpixel antialiasing for CONTENT_COLOR_ALPHA surfaces generally
+ * requires that the pixels in the areas under a subpixel antialiasing
+ * operation already be opaque.
+ *
+ * Since: 1.12
+ **/
+void
+cairo_surface_set_subpixel_antialiasing (cairo_surface_t *surface,
+ cairo_subpixel_antialiasing_t enabled)
+{
+ if (surface->status)
+ return;
+
+ if (surface->finished) {
+ _cairo_surface_set_error (surface, CAIRO_STATUS_SURFACE_FINISHED);
+ return;
+ }
+
+ surface->permit_subpixel_antialiasing =
+ enabled == CAIRO_SUBPIXEL_ANTIALIASING_ENABLED;
+}
+slim_hidden_def (cairo_surface_set_subpixel_antialiasing);
+
+/**
+ * cairo_surface_get_subpixel_antialiasing:
+ * @surface: a #cairo_surface_t
+ *
+ * Gets whether the surface supports subpixel antialiasing. By default,
+ * CAIRO_CONTENT_COLOR surfaces support subpixel antialiasing but other
+ * surfaces do not.
+ *
+ * Since: 1.12
+ **/
+cairo_subpixel_antialiasing_t
+cairo_surface_get_subpixel_antialiasing (cairo_surface_t *surface)
+{
+ if (surface->status)
+ return CAIRO_SUBPIXEL_ANTIALIASING_DISABLED;
+
+ return surface->permit_subpixel_antialiasing ?
+ CAIRO_SUBPIXEL_ANTIALIASING_ENABLED : CAIRO_SUBPIXEL_ANTIALIASING_DISABLED;
+}
+slim_hidden_def (cairo_surface_get_subpixel_antialiasing);
+
/* Note: the backends may modify the contents of the glyph array as long as
* they do not return %CAIRO_INT_STATUS_UNSUPPORTED. This makes it possible to
* avoid copying the array again and again, and edit it in-place.
* Backends are in fact free to use the array as a generic buffer as they
* see fit.
*
* For show_glyphs backend method, and NOT for show_text_glyphs method,
* when they do return UNSUPPORTED, they may adjust remaining_glyphs to notify
diff --git a/gfx/cairo/cairo/src/cairo-win32-font.c b/gfx/cairo/cairo/src/cairo-win32-font.c
--- a/gfx/cairo/cairo/src/cairo-win32-font.c
+++ b/gfx/cairo/cairo/src/cairo-win32-font.c
@@ -1380,16 +1380,17 @@ _cairo_win32_scaled_font_show_glyphs (vo
cairo_win32_surface_t *surface = (cairo_win32_surface_t *)generic_surface;
cairo_status_t status;
if (width == 0 || height == 0)
return CAIRO_STATUS_SUCCESS;
if (_cairo_surface_is_win32 (generic_surface) &&
surface->format == CAIRO_FORMAT_RGB24 &&
+ (generic_surface->permit_subpixel_antialiasing || scaled_font->quality != CLEARTYPE_QUALITY) &&
op == CAIRO_OPERATOR_OVER &&
_cairo_pattern_is_opaque_solid (pattern)) {
cairo_solid_pattern_t *solid_pattern = (cairo_solid_pattern_t *)pattern;
/* When compositing OVER on a GDI-understood surface, with a
* solid opaque color, we can just call ExtTextOut directly.
*/
@@ -1411,16 +1412,18 @@ _cairo_win32_scaled_font_show_glyphs (vo
* surface by drawing the the glyphs onto a DIB, black-on-white then
* inverting. GDI outputs gamma-corrected images so inverted black-on-white
* is very different from white-on-black. We favor the more common
* case where the final output is dark-on-light.
*/
cairo_win32_surface_t *tmp_surface;
cairo_surface_t *mask_surface;
cairo_surface_pattern_t mask;
+ cairo_bool_t use_subpixel_antialiasing =
+ scaled_font->quality == CLEARTYPE_QUALITY && generic_surface->permit_subpixel_antialiasing;
RECT r;
tmp_surface = (cairo_win32_surface_t *)cairo_win32_surface_create_with_dib (CAIRO_FORMAT_ARGB32, width, height);
if (tmp_surface->base.status)
return tmp_surface->base.status;
r.left = 0;
r.top = 0;
@@ -1432,17 +1435,17 @@ _cairo_win32_scaled_font_show_glyphs (vo
scaled_font, RGB (0, 0, 0),
dest_x, dest_y,
glyphs, num_glyphs);
if (status) {
cairo_surface_destroy (&tmp_surface->base);
return status;
}
- if (scaled_font->quality == CLEARTYPE_QUALITY) {
+ if (use_subpixel_antialiasing) {
/* For ClearType, we need a 4-channel mask. If we are compositing on
* a surface with alpha, we need to compute the alpha channel of
* the mask (we just copy the green channel). But for a destination
* surface without alpha the alpha channel of the mask is ignored
*/
if (surface->format != CAIRO_FORMAT_RGB24)
_compute_argb32_mask_alpha (tmp_surface);
@@ -1460,17 +1463,17 @@ _cairo_win32_scaled_font_show_glyphs (vo
/* For op == OVER, no-cleartype, a possible optimization here is to
* draw onto an intermediate ARGB32 surface and alpha-blend that with the
* destination
*/
_cairo_pattern_init_for_surface (&mask, mask_surface);
cairo_surface_destroy (mask_surface);
- if (scaled_font->quality == CLEARTYPE_QUALITY)
+ if (use_subpixel_antialiasing)
mask.base.has_component_alpha = TRUE;
status = _cairo_surface_composite (op, pattern,
&mask.base,
&surface->base,
source_x, source_y,
0, 0,
dest_x, dest_y,
diff --git a/gfx/cairo/cairo/src/cairo-xlib-surface.c b/gfx/cairo/cairo/src/cairo-xlib-surface.c
--- a/gfx/cairo/cairo/src/cairo-xlib-surface.c
+++ b/gfx/cairo/cairo/src/cairo-xlib-surface.c
@@ -3570,16 +3570,17 @@ typedef struct _cairo_xlib_font_glyphset
GlyphSet glyphset;
cairo_format_t format;
XRenderPictFormat *xrender_format;
cairo_xlib_font_glyphset_free_glyphs_t *pending_free_glyphs;
} cairo_xlib_font_glyphset_info_t;
typedef struct _cairo_xlib_surface_font_private {
cairo_scaled_font_t *scaled_font;
+ cairo_scaled_font_t *grayscale_font;
cairo_xlib_hook_t close_display_hook;
cairo_xlib_display_t *display;
cairo_xlib_font_glyphset_info_t glyphset_info[NUM_GLYPHSETS];
} cairo_xlib_surface_font_private_t;
/* callback from CloseDisplay */
static void
_cairo_xlib_surface_remove_scaled_font (cairo_xlib_display_t *display,
@@ -3599,16 +3600,20 @@ _cairo_xlib_surface_remove_scaled_font (
_cairo_scaled_font_reset_cache (scaled_font);
CAIRO_MUTEX_UNLOCK (scaled_font->mutex);
if (font_private != NULL) {
Display *dpy;
int i;
+ if (font_private->grayscale_font) {
+ cairo_scaled_font_destroy (font_private->grayscale_font);
+ }
+
dpy = _cairo_xlib_display_get_dpy (display);
for (i = 0; i < NUM_GLYPHSETS; i++) {
cairo_xlib_font_glyphset_info_t *glyphset_info;
glyphset_info = &font_private->glyphset_info[i];
if (glyphset_info->glyphset)
XRenderFreeGlyphSet (dpy, glyphset_info->glyphset);
@@ -3629,16 +3634,17 @@ _cairo_xlib_surface_font_init (Display
cairo_status_t status;
int i;
font_private = malloc (sizeof (cairo_xlib_surface_font_private_t));
if (unlikely (font_private == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
font_private->scaled_font = scaled_font;
+ font_private->grayscale_font = NULL;
status = _cairo_xlib_display_get (dpy, &font_private->display);
if (unlikely (status)) {
free (font_private);
return status;
}
/* initialize and hook into the CloseDisplay callback */
font_private->close_display_hook.func =
@@ -3671,16 +3677,20 @@ _cairo_xlib_surface_scaled_font_fini (ca
{
cairo_xlib_surface_font_private_t *font_private;
font_private = scaled_font->surface_private;
if (font_private != NULL) {
cairo_xlib_display_t *display;
int i;
+ if (font_private->grayscale_font) {
+ cairo_scaled_font_destroy (font_private->grayscale_font);
+ }
+
display = font_private->display;
_cairo_xlib_remove_close_display_hook (display,
&font_private->close_display_hook);
for (i = 0; i < NUM_GLYPHSETS; i++) {
cairo_xlib_font_glyphset_info_t *glyphset_info;
glyphset_info = &font_private->glyphset_info[i];
@@ -4417,16 +4427,62 @@ _cairo_xlib_surface_owns_font (cairo_xli
(font_private != NULL && font_private->display != dst->display))
{
return FALSE;
}
return TRUE;
}
+/* Gets a grayscale version of scaled_font. The grayscale version is cached
+ * in our surface_private data.
+ */
+static cairo_scaled_font_t *
+_cairo_xlib_get_grayscale_font (cairo_xlib_surface_t *dst,
+ cairo_scaled_font_t *scaled_font)
+{
+ cairo_xlib_surface_font_private_t *font_private = scaled_font->surface_private;
+ cairo_bool_t needs_font;
+
+ if (font_private == NULL) {
+ cairo_status_t status = _cairo_xlib_surface_font_init (dst->dpy, scaled_font);
+ if (unlikely (status))
+ return _cairo_scaled_font_create_in_error (status);
+ font_private = scaled_font->surface_private;
+ }
+
+ CAIRO_MUTEX_LOCK (scaled_font->mutex);
+ needs_font = !font_private->grayscale_font;
+ CAIRO_MUTEX_UNLOCK (scaled_font->mutex);
+
+ if (needs_font) {
+ cairo_font_options_t options;
+ cairo_scaled_font_t *new_font;
+
+ options = scaled_font->options;
+ options.antialias = CAIRO_ANTIALIAS_GRAY;
+ new_font = cairo_scaled_font_create (scaled_font->font_face,
+ &scaled_font->font_matrix,
+ &scaled_font->ctm, &options);
+
+ CAIRO_MUTEX_LOCK (scaled_font->mutex);
+ if (!font_private->grayscale_font) {
+ font_private->grayscale_font = new_font;
+ new_font = NULL;
+ }
+ CAIRO_MUTEX_UNLOCK (scaled_font->mutex);
+
+ if (new_font) {
+ cairo_scaled_font_destroy (new_font);
+ }
+ }
+
+ return font_private->grayscale_font;
+}
+
static cairo_int_status_t
_cairo_xlib_surface_show_glyphs (void *abstract_dst,
cairo_operator_t op,
const cairo_pattern_t *src_pattern,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
cairo_clip_t *clip,
@@ -4475,16 +4531,21 @@ _cairo_xlib_surface_show_glyphs (void
operation = _categorize_composite_operation (dst, op, src_pattern, TRUE);
if (operation == DO_UNSUPPORTED)
return UNSUPPORTED ("unsupported op");
if (! _cairo_xlib_surface_owns_font (dst, scaled_font))
return UNSUPPORTED ("unowned font");
+ if (!dst->base.permit_subpixel_antialiasing &&
+ scaled_font->options.antialias == CAIRO_ANTIALIAS_SUBPIXEL) {
+ scaled_font = _cairo_xlib_get_grayscale_font (dst, scaled_font);
+ }
+
X_DEBUG ((dst->dpy, "show_glyphs (dst=%x)", (unsigned int) dst->drawable));
if (clip_region != NULL &&
cairo_region_num_rectangles (clip_region) == 1)
{
cairo_rectangle_int_t glyph_extents;
const cairo_rectangle_int_t *clip_extents;
diff --git a/gfx/cairo/cairo/src/cairo.h b/gfx/cairo/cairo/src/cairo.h
--- a/gfx/cairo/cairo/src/cairo.h
+++ b/gfx/cairo/cairo/src/cairo.h
@@ -2101,16 +2101,35 @@ cairo_public void
cairo_surface_copy_page (cairo_surface_t *surface);
cairo_public void
cairo_surface_show_page (cairo_surface_t *surface);
cairo_public cairo_bool_t
cairo_surface_has_show_text_glyphs (cairo_surface_t *surface);
+/**
+ * _cairo_subpixel_antialiasing_t:
+ * @CAIRO_SUBPIXEL_ANTIALIASING_ENABLED: subpixel antialiasing is enabled
+ * for this surface.
+ * @CAIRO_SUBPIXEL_ANTIALIASING_DISABLED: subpixel antialiasing is disabled
+ * for this surface.
+ */
+typedef enum _cairo_subpixel_antialiasing_t {
+ CAIRO_SUBPIXEL_ANTIALIASING_ENABLED,
+ CAIRO_SUBPIXEL_ANTIALIASING_DISABLED
+} cairo_subpixel_antialiasing_t;
+
+cairo_public void
+cairo_surface_set_subpixel_antialiasing (cairo_surface_t *surface,
+ cairo_subpixel_antialiasing_t enabled);
+
+cairo_public cairo_subpixel_antialiasing_t
+cairo_surface_get_subpixel_antialiasing (cairo_surface_t *surface);
+
/* Image-surface functions */
/**
* cairo_format_t:
* @CAIRO_FORMAT_ARGB32: each pixel is a 32-bit quantity, with
* alpha in the upper 8 bits, then red, then green, then blue.
* The 32-bit quantities are stored native-endian. Pre-multiplied
* alpha is used. (That is, 50% transparent red is 0x80800000,
diff --git a/gfx/cairo/cairo/src/cairoint.h b/gfx/cairo/cairo/src/cairoint.h
--- a/gfx/cairo/cairo/src/cairoint.h
+++ b/gfx/cairo/cairo/src/cairoint.h
@@ -2750,16 +2750,18 @@ slim_hidden_proto (cairo_surface_destroy
slim_hidden_proto (cairo_surface_finish);
slim_hidden_proto (cairo_surface_flush);
slim_hidden_proto (cairo_surface_get_content);
slim_hidden_proto (cairo_surface_get_device_offset);
slim_hidden_proto (cairo_surface_get_font_options);
slim_hidden_proto (cairo_surface_get_mime_data);
slim_hidden_proto (cairo_surface_get_type);
slim_hidden_proto (cairo_surface_has_show_text_glyphs);
+slim_hidden_proto (cairo_surface_set_subpixel_antialiasing);
+slim_hidden_proto (cairo_surface_get_subpixel_antialiasing);
slim_hidden_proto (cairo_surface_mark_dirty_rectangle);
slim_hidden_proto_no_warn (cairo_surface_reference);
slim_hidden_proto (cairo_surface_set_device_offset);
slim_hidden_proto (cairo_surface_set_fallback_resolution);
slim_hidden_proto (cairo_surface_set_mime_data);
slim_hidden_proto (cairo_surface_show_page);
slim_hidden_proto (cairo_surface_status);
slim_hidden_proto (cairo_text_cluster_allocate);
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