void
gimp_font_list_restore (GimpFontList *list)
{
PangoFontMap *fontmap;
PangoContext *context;
g_return_if_fail (GIMP_IS_FONT_LIST (list));
fontmap = pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT);
if (! fontmap)
g_error ("You are using a Pango that has been built against a cairo "
"that lacks the Freetype font backend");
pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (fontmap),
list->yresolution);
context = pango_font_map_create_context (fontmap);
g_object_unref (fontmap);
gimp_container_freeze (GIMP_CONTAINER (list));
gimp_font_list_load_names (list, PANGO_FONT_MAP (fontmap), context);
g_object_unref (context);
gimp_list_sort_by_name (GIMP_LIST (list));
gimp_container_thaw (GIMP_CONTAINER (list));
}
gboolean
text_get_extents (const gchar *fontname,
const gchar *text,
gint *width,
gint *height,
gint *ascent,
gint *descent)
{
PangoFontDescription *font_desc;
PangoContext *context;
PangoLayout *layout;
PangoFontMap *fontmap;
PangoRectangle rect;
g_return_val_if_fail (fontname != NULL, FALSE);
g_return_val_if_fail (text != NULL, FALSE);
fontmap = pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT);
if (! fontmap)
g_error ("You are using a Pango that has been built against a cairo "
"that lacks the Freetype font backend");
pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (fontmap),
72.0); /* FIXME: resolution */
context = pango_font_map_create_context (fontmap);
g_object_unref (fontmap);
layout = pango_layout_new (context);
g_object_unref (context);
font_desc = pango_font_description_from_string (fontname);
pango_layout_set_font_description (layout, font_desc);
pango_font_description_free (font_desc);
pango_layout_set_text (layout, text, -1);
pango_layout_get_pixel_extents (layout, NULL, &rect);
if (width)
*width = rect.width;
if (height)
*height = rect.height;
if (ascent || descent)
{
PangoLayoutIter *iter;
PangoLayoutLine *line;
iter = pango_layout_get_iter (layout);
line = pango_layout_iter_get_line_readonly (iter);
pango_layout_iter_free (iter);
pango_layout_line_get_pixel_extents (line, NULL, &rect);
if (ascent)
*ascent = PANGO_ASCENT (rect);
if (descent)
*descent = - PANGO_DESCENT (rect);
}
g_object_unref (layout);
return TRUE;
}
bool
TextAsset::load()
{
// Set up a temporary Cairo surface/context for text measurement
cairo_surface_t* probeSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
if (cairo_surface_status(probeSurface) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Could not create Cairo surface\n");
_error = true;
return false;
}
cairo_t* probeContext = cairo_create(probeSurface);
if (cairo_status(probeContext) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Could not create Cairo context\n");
_error = true;
return false;
}
// Text rectangle drawn within border
const int idealWidth = _maxSize.width - _marginLeft - _marginRight;
const Size textRegion(idealWidth, _maxSize.height - _marginTop - _marginBottom);
const float fontSize = primaryFontSize(probeContext, textRegion);
const std::string fontDesc = _fontName + " " + boost::lexical_cast<std::string>(fontSize);
PangoFontDescription* fontDescription = pango_font_description_from_string(fontDesc.c_str());
const std::string req_desc_str(pango_font_description_to_string(fontDescription));
PangoFontMap* fontMap = pango_cairo_font_map_new_for_font_type(CAIRO_FONT_TYPE_FT);
PangoContext* pango_context = pango_font_map_create_context(fontMap);
// TODO: Does this need to be freed or does the context take it with it?
PangoFont* pangoFont = pango_font_map_load_font(fontMap, pango_context, fontDescription);
PangoFontDescription* reverseDescription = pango_font_describe(pangoFont);
const std::string match_desc_str(pango_font_description_to_string(reverseDescription));
pango_font_description_free(reverseDescription);
g_object_unref(pango_context);
if (req_desc_str.find(match_desc_str) == std::string::npos) {
fprintf(stderr, "Warning: Unable to correctly match font \"%s\", using "
"\"%s\" instead.\n", req_desc_str.c_str(), match_desc_str.c_str());
}
float shadowXOffset = 0;
float shadowYOffset = 0;
if (_dropShadow) {
shadowXOffset = _dropShadowOffset.x() * CLIENT_TO_SERVER_SCALE * fontSize;
shadowYOffset = _dropShadowOffset.y() * CLIENT_TO_SERVER_SCALE * fontSize;
}
Rect tight;
const Size textSize = computeSizeOfText(probeContext, _textContent, idealWidth, fontDescription, &tight);
const Size imageSize = imageSizeForTextSize(tight.size, shadowXOffset, shadowYOffset);
// Tear down scratch contexts
cairo_destroy(probeContext);
cairo_surface_destroy(probeSurface);
const int width = imageSize.width;
const int height = imageSize.height;
// Configure the actual Cairo drawing surface/context now that we know the final resolution
cairo_surface_t* cairoSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
if (cairo_surface_status(cairoSurface) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Could not create Cairo surface\n");
_error = true;
return false;
}
cairo_t* cairoContext = cairo_create(cairoSurface);
// Flip the context like in the iOS version.
// This fixes flipped filters associated with text assets.
cairo_translate(cairoContext, 0.0, height);
cairo_scale(cairoContext, 1.0, -1.0);
if (cairo_status(cairoContext) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Could not create Cairo context\n");
_error = true;
return false;
}
// Fill the box with the background color
cairo_save(cairoContext);
cairo_set_operator(cairoContext, CAIRO_OPERATOR_SOURCE);
const mf::Color& bgColor(_style->getBackgroundColor());
cairo_set_source_rgba(cairoContext, bgColor.red, bgColor.green, bgColor.blue, bgColor.alpha);
if (_shape == 0) {
if (_cornerWidth > 0 && _cornerHeight > 0) {
// TODO: Support independent corner width and height
drawRoundedRect(cairoContext, 0, 0, imageSize.width, imageSize.height, _cornerWidth);
} else {
cairo_paint(cairoContext);
if (_strokeThickness > 0.0f) {
drawStrokedRect(cairoContext, 0, 0, imageSize.width, imageSize.height, _strokeThickness);
}
}
} else if (_shape == 1) {
strokeFillBezier(cairoContext, 0, 0, imageSize.width, imageSize.height, _strokeThickness);
}
cairo_restore(cairoContext);
const Rect textRect = textRectForTextSize(textSize, imageSize, tight);
if (_dropShadow) {
const Rect shadowRect(textRect.x + shadowXOffset,
textRect.y + shadowYOffset,
textRect.size.width,
textRect.size.height);
cairo_set_source_rgba(cairoContext,
_dropShadowColor.red,
_dropShadowColor.green,
_dropShadowColor.blue,
_dropShadowColor.alpha);
drawText(cairoContext, _textContent, shadowRect, fontDescription, false);
}
cairo_set_source_rgba(cairoContext, _textColor.red, _textColor.green, _textColor.blue, _textColor.alpha);
if (_textColor.alpha > 0.0) {
drawText(cairoContext, _textContent, textRect, fontDescription, true);
}
// DEBUG: Dump rendered text to an image
// cairo_surface_write_to_png(cairoSurface, "text.png");
// Transfer Cairo surface to OpenGL texture
GLubyte* imageData = static_cast<GLubyte *>(cairo_image_surface_get_data(cairoSurface));
glGenTextures(1, &_texture.textureID);
glBindTexture(GL_TEXTURE_2D, _texture.textureID);
_texture.width = width;
_texture.height = height;
_texture.s = 1.0;
_texture.t = 1.0;
_texture.aspect = static_cast<GLfloat>(_texture.width) / _texture.height;
_texture.flipImage = true;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
#ifdef GL_BGRA
// Allocate and transfer data into texture (allow OpenGL swizzling)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, imageData);
#else
// Cairo uses a BGRA layout, OpenGL ES 2.0 does not support GL_BGRA as a
// source format so manually perform swizzling.
for (size_t i = 0; i < width * height * BYTES_PER_PIXEL; i += BYTES_PER_PIXEL) {
std::swap(imageData[i], imageData[i + 2]);
}
// Allocate and transfer data into texture
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);
#endif
// Clean up
pango_font_description_free(fontDescription);
cairo_destroy(cairoContext);
cairo_surface_destroy(cairoSurface);
g_object_unref(pangoFont);
_loading = false;
_loaded = !_loading && !_error;
return true;
}
