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#include "Nux.h"
#include "Layout.h"
#include "HLayout.h"
#include "VLayout.h"
#include "Validator.h"
#include "cairo/cairo.h"
#include "pango/pango.h"
#include "pango/pangocairo.h"
#include "NuxGraphics/CairoGraphics.h"
#include "PangoText.h"
namespace nux
{
PangoText::PangoText(const char* text, NUX_FILE_LINE_DECL)
: View(NUX_FILE_LINE_PARAM)
{
_pango_font_map = pango_ft2_font_map_new();
_pango_context = pango_font_map_create_context(PANGO_FONT_MAP(_pango_font_map));
_pango_layout = pango_layout_new(_pango_context);
_pango_font_desc = pango_font_description_from_string("Sans, 20");
_size_match_text = true;
_textColor = color::White;
_texture2D = 0;
SetMinimumSize(DEFAULT_WIDGET_WIDTH, PRACTICAL_WIDGET_HEIGHT);
SetText(text);
}
PangoText::~PangoText()
{
if (_cairoGraphics == 0)
delete(_cairoGraphics);
if (_texture2D == 0)
delete(_texture2D);
}
void PangoText::PreLayoutManagement()
{
int textWidth = 0;
int textHeight = 0;
GetTextExtents("Ubuntu", textWidth, textHeight);
_pre_layout_width = GetBaseWidth();
_pre_layout_height = GetBaseHeight();
SetBaseSize(textWidth, textHeight);
if (_texture2D == 0)
{
UpdateTextLayout();
}
View::PreLayoutManagement();
}
long PangoText::PostLayoutManagement(long layoutResult)
{
// long result = View::PostLayoutManagement(layoutResult);
long result = 0;
int w = GetBaseWidth();
int h = GetBaseHeight();
if (_pre_layout_width < w)
result |= eLargerWidth;
else if (_pre_layout_width > w)
result |= eSmallerWidth;
else
result |= eCompliantWidth;
if (_pre_layout_height < h)
result |= eLargerHeight;
else if (_pre_layout_height > h)
result |= eSmallerHeight;
else
result |= eCompliantHeight;
return result;
}
void PangoText::SetSizeMatchText(bool size_match_text)
{
_size_match_text = size_match_text;
}
bool PangoText::GetSizeMatchText() const
{
return _size_match_text;
}
void PangoText::Draw(GraphicsEngine& gfxContext, bool forceDraw)
{
Geometry base = GetGeometry();
gfxContext.PushClippingRectangle(base);
TexCoordXForm texxform;
texxform.SetWrap(TEXWRAP_REPEAT, TEXWRAP_REPEAT);
texxform.SetTexCoordType(TexCoordXForm::OFFSET_COORD);
gfxContext.GetRenderStates().SetBlend(true,
GL_ONE,
GL_ONE_MINUS_SRC_ALPHA);
gfxContext.QRP_1Tex(base.x,
base.y,
base.width,
base.height,
_texture2D->GetDeviceTexture(),
texxform,
_textColor);
gfxContext.GetRenderStates().SetBlend(false);
gfxContext.PopClippingRectangle();
}
void PangoText::DrawContent(GraphicsEngine& gfxContext, bool forceDraw)
{
}
void PangoText::SetText(std::string text)
{
if (_text != text)
{
_text = text;
UpdateTextLayout();
sigTextChanged.emit(this);
}
}
void PangoText::SetTextColor(Color textColor)
{
if (_textColor != textColor)
{
_textColor = textColor;
sigTextColorChanged.emit(this);
}
}
void PangoText::GetTextExtents(int &width, int &height)
{
GetTextExtents("Ubuntu", width, height);
}
void PangoText::GetTextExtents(const char* font, int& width, int& height)
{
cairo_surface_t* surface = NULL;
cairo_t* cr = NULL;
PangoLayout* layout = NULL;
PangoFontDescription* desc = NULL;
PangoContext* pangoCtx = NULL;
PangoRectangle logRect = {0, 0, 0, 0};
int dpi = 96;
// sanity check
if (!font)
return;
surface = cairo_image_surface_create(CAIRO_FORMAT_A1, 1, 1);
cr = cairo_create(surface);
CairoFontOptions font_options;
cairo_font_options_set_antialias (font_options, CAIRO_ANTIALIAS_DEFAULT);
cairo_font_options_set_subpixel_order(font_options, CAIRO_SUBPIXEL_ORDER_DEFAULT);
cairo_font_options_set_hint_style (font_options, CAIRO_HINT_STYLE_DEFAULT);
cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_ON);
cairo_set_font_options(cr, font_options);
layout = pango_cairo_create_layout(cr);
desc = pango_font_description_from_string(font);
pango_font_description_set_weight(desc, PANGO_WEIGHT_NORMAL);
pango_layout_set_font_description(layout, desc);
pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
pango_layout_set_text(layout, _text.c_str(), -1);
pangoCtx = pango_layout_get_context(layout); // is not ref'ed
pango_cairo_context_set_font_options(pangoCtx, font_options);
// use some default DPI-value
pango_cairo_context_set_resolution(pangoCtx, dpi);
pango_layout_context_changed(layout);
pango_layout_get_extents(layout, NULL, &logRect);
width = logRect.width / PANGO_SCALE;
height = logRect.height / PANGO_SCALE;
// clean up
pango_font_description_free(desc);
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
void PangoText::DrawText(void* cairo_context, int width, int height, Color color)
{
cairo_t* cr = (cairo_t*) cairo_context;
int textWidth = 0;
int textHeight = 0;
PangoLayout* layout = NULL;
PangoFontDescription* desc = NULL;
PangoContext* pangoCtx = NULL;
int dpi = 0;
GetTextExtents("Ubuntu", textWidth, textHeight);
CairoFontOptions font_options;
cairo_font_options_set_antialias (font_options, CAIRO_ANTIALIAS_DEFAULT);
cairo_font_options_set_subpixel_order(font_options, CAIRO_SUBPIXEL_ORDER_DEFAULT);
cairo_font_options_set_hint_style (font_options, CAIRO_HINT_STYLE_DEFAULT);
cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_ON);
cairo_set_font_options(cr, font_options);
layout = pango_cairo_create_layout(cr);
desc = pango_font_description_from_string("Ubuntu");
pango_layout_set_font_description(layout, desc);
pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
pango_layout_set_text(layout, _text.c_str(), -1);
pangoCtx = pango_layout_get_context(layout);
pango_cairo_context_set_font_options(pangoCtx, font_options);
pango_cairo_context_set_resolution(pangoCtx, dpi);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 0.0f, 0.0f, 0.0f, 0.0f);
cairo_paint(cr);
cairo_set_source_rgba(cr, color.red, color.green, color.blue, color.alpha);
pango_layout_context_changed(layout);
cairo_move_to(cr, 0.0f, 0.0f);
pango_cairo_show_layout(cr, layout);
// clean up
pango_font_description_free(desc);
g_object_unref(layout);
}
void PangoText::UpdateTextLayout()
{
pango_layout_set_text(_pango_layout, _text.c_str(), -1);
// reset the glyph string
if (_glyph_text)
delete(_glyph_text);
_glyph_text = 0;
_glyph_length = 0;
int max_g = 0;
double pango_to_ink = (1.0/((double) PANGO_SCALE));
PangoLayoutIter* pIter = pango_layout_get_iter(_pango_layout); // and go!
do
{
// typedef struct {
// PangoLayout *layout;
// gint start_index; // start of line as byte index into layout->text.
// gint length; // length of line in bytes.
// GSList *runs; // a list containing the runs of the line in visual order.
// guint is_paragraph_start : 1; // TRUE if this is the first line of the paragraph.
// guint resolved_dir : 3; // Resolved direction of line.
// } PangoLayoutLine;
PangoLayoutLine* pLine = pango_layout_iter_get_line(pIter); // no need for unref
int plOffset = pLine->start_index; // start of the line in the uni32_text
PangoRectangle ink_r;
PangoRectangle log_r;
pango_layout_iter_get_line_extents(pIter, &ink_r, &log_r);
double plY = (1.0 / ((double) PANGO_SCALE)) * ((double) log_r.y); // start position of this line of the layout
double plX = (1.0 / ((double) PANGO_SCALE)) * ((double) log_r.x);
GSList* curR = pLine->runs;
// Iterate over the runs of this line
while (curR)
{
// typedef struct {
// PangoItem *item; // a PangoItem structure that provides information about a segment of text.
// PangoGlyphString *glyphs; // the glyphs obtained by shaping the text corresponding to item.
// } PangoLayoutRun, PangoGlyphItem;
//
// typedef struct {
// gint offset; // the offset of the segment from the beginning of the string in bytes.
// gint length; // the length of the segment in bytes.
// gint num_chars; // the length of the segment in characters.
// PangoAnalysis analysis; // the properties of the segment.
// } PangoItem;
// typedef struct {
// gint num_glyphs;
//
// PangoGlyphInfo *glyphs;
//
// /* This is a memory inefficient way of representing the information
// * here - each value gives the byte index within the text
// * corresponding to the glyph string of the start of the cluster to
// * which the glyph belongs.
// */
// gint *log_clusters;
// } PangoGlyphString;
PangoLayoutRun* pRun = (PangoLayoutRun*) curR->data;
int prOffset = pRun->item->offset; // the offset of the segment from the beginning of the line in bytes
if (pRun)
{
// a run has uniform font/directionality/etc...
int o_g_l = _glyph_length; // save the index of the first glyph we'll add
for (int i = 0; i < pRun->glyphs->num_glyphs; i++)
{
// add glyph sequentially, reading them from the run. realloc space for the glyphs
if (_glyph_length >= max_g)
{
max_g = 2 * _glyph_length + 1;
pango_glyph* temp = new pango_glyph [max_g + 1];
if (_glyph_length == 0)
{
_glyph_text = temp;
}
else
{
std::memcpy(temp, _glyph_text, _glyph_length * sizeof(pango_glyph));
delete _glyph_text;
_glyph_text = temp;
}
}
// fill the glyph info
_glyph_text[_glyph_length].font = pRun->item->analysis.font;
_glyph_text[_glyph_length].gl = pRun->glyphs->glyphs[i].glyph;
_glyph_text[_glyph_length].uni_st = plOffset + prOffset + pRun->glyphs->log_clusters[i];
// depending on the directionality, the last uni32 codepoint for this glyph is the first of the next char
// or the first of the previous
if (pRun->item->analysis.level == 1)
{
// rtl
if (i < pRun->glyphs->num_glyphs - 1)
{
_glyph_text[_glyph_length + 1].uni_en = _glyph_text[_glyph_length].uni_st;
}
_glyph_text[_glyph_length].uni_dir = 1;
_glyph_text[_glyph_length + 1].uni_dir = 1; // set the directionality for the next too, so that the last glyph in
// the array has the correct direction
}
else
{
// ltr
if (i > 0)
{
_glyph_text[_glyph_length - 1].uni_en = _glyph_text[_glyph_length].uni_st;
}
_glyph_text[_glyph_length].uni_dir = 0;
_glyph_text[_glyph_length + 1].uni_dir = 0;
}
// set the position
// the layout is an infinite line
_glyph_text[_glyph_length].x = plX + pango_to_ink * ((double) pRun->glyphs->glyphs[i].geometry.x_offset);
_glyph_text[_glyph_length].y = plY + pango_to_ink * ((double) pRun->glyphs->glyphs[i].geometry.y_offset);
// advance to the next glyph
plX += pango_to_ink * ((double) pRun->glyphs->glyphs[i].geometry.width);
// and set the next glyph's position, in case it's the terminating glyph
_glyph_text[_glyph_length+1].x = plX;
_glyph_text[_glyph_length+1].y = plY;
_glyph_length++;
}
// and finish filling the info
// notably, the uni_en of the last char in ltr text and the uni_en of the first in rtl are still not set
if (pRun->item->analysis.level == 1)
{
// rtl
if (_glyph_length > o_g_l)
_glyph_text[o_g_l].uni_en=plOffset+prOffset+pRun->item->length;
}
else
{
if (_glyph_length > 0)
_glyph_text[_glyph_length-1].uni_en=plOffset+prOffset+pRun->item->length;
}
// the terminating glyph has glyph_id=0 because it means 'no glyph'
_glyph_text[_glyph_length].gl = 0;
// and is associated with no text(but you cannot set uni_st=uni_en=0, because the termination
// is expected to be the glyph for the termination of the uni32_text)
_glyph_text[_glyph_length].uni_st = _glyph_text[_glyph_length].uni_en = plOffset + prOffset + pRun->item->length;
}
curR = curR->next;
}
} while ( pango_layout_iter_next_line(pIter));
pango_layout_iter_free(pIter);
}
void PangoText::ComputeTextLayout()
{
PangoLayout* layout = NULL;
PangoFontDescription* desc = NULL;
PangoContext* pangoCtx = NULL;
PangoRectangle logRect = {0, 0, 0, 0};
int dpi = 96;
}
}
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