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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "app/gfx/canvas.h"
#include <cairo/cairo.h>
#include <pango/pango.h>
#include <pango/pangocairo.h>
#include "app/gfx/font.h"
#include "base/gfx/rect.h"
#include "base/logging.h"
#include "base/string_util.h"
namespace {
// Returns a new pango font, free with pango_font_description_free().
PangoFontDescription* PangoFontFromGfxFont(const gfx::Font& gfx_font) {
gfx::Font font = gfx_font; // Copy so we can call non-const methods.
PangoFontDescription* pfd = pango_font_description_new();
pango_font_description_set_family(pfd, WideToUTF8(font.FontName()).c_str());
pango_font_description_set_size(pfd, font.FontSize() * PANGO_SCALE);
switch (font.style()) {
case gfx::Font::NORMAL:
// Nothing to do, should already be PANGO_STYLE_NORMAL.
break;
case gfx::Font::BOLD:
pango_font_description_set_weight(pfd, PANGO_WEIGHT_BOLD);
break;
case gfx::Font::ITALIC:
pango_font_description_set_style(pfd, PANGO_STYLE_ITALIC);
break;
case gfx::Font::UNDERLINED:
// TODO(deanm): How to do underlined? Where do we use it? Probably have
// to paint it ourselves, see pango_font_metrics_get_underline_position.
break;
}
return pfd;
}
} // namespace
namespace gfx {
Canvas::Canvas(int width, int height, bool is_opaque)
: skia::PlatformCanvas(width, height, is_opaque) {
}
Canvas::Canvas() : skia::PlatformCanvas() {
}
Canvas::~Canvas() {
}
// static
void Canvas::SizeStringInt(const std::wstring& text,
const gfx::Font& font,
int* width, int* height, int flags) {
cairo_surface_t* surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 0, 0);
cairo_t* cr = cairo_create(surface);
PangoLayout* layout = pango_cairo_create_layout(cr);
if (flags & NO_ELLIPSIS) {
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
} else {
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
}
if (flags & TEXT_ALIGN_CENTER) {
pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
} else if (flags & TEXT_ALIGN_RIGHT) {
pango_layout_set_alignment(layout, PANGO_ALIGN_RIGHT);
}
if (flags & MULTI_LINE) {
pango_layout_set_wrap(layout,
(flags & CHARACTER_BREAK) ? PANGO_WRAP_WORD_CHAR : PANGO_WRAP_WORD);
}
std::string utf8 = WideToUTF8(text);
pango_layout_set_text(layout, utf8.data(), utf8.size());
PangoFontDescription* desc = PangoFontFromGfxFont(font);
pango_layout_set_font_description(layout, desc);
pango_layout_get_size(layout, width, height);
*width /= PANGO_SCALE;
*height /= PANGO_SCALE;
g_object_unref(layout);
pango_font_description_free(desc);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
void Canvas::ApplySkiaMatrixToCairoContext(cairo_t* cr) {
const SkMatrix& skia_matrix = getTotalMatrix();
cairo_matrix_t cairo_matrix;
cairo_matrix_init(&cairo_matrix,
SkScalarToFloat(skia_matrix.getScaleX()),
SkScalarToFloat(skia_matrix.getSkewY()),
SkScalarToFloat(skia_matrix.getSkewX()),
SkScalarToFloat(skia_matrix.getScaleY()),
SkScalarToFloat(skia_matrix.getTranslateX()),
SkScalarToFloat(skia_matrix.getTranslateY()));
cairo_set_matrix(cr, &cairo_matrix);
}
void Canvas::DrawStringInt(const std::wstring& text,
const gfx::Font& font,
const SkColor& color, int x, int y, int w, int h,
int flags) {
cairo_surface_t* surface = beginPlatformPaint();
cairo_t* cr = cairo_create(surface);
// We're going to draw onto the surface directly. This circumvents the matrix
// installed by Skia. Apply the matrix from skia to cairo so they align and
// we draw at the right place.
ApplySkiaMatrixToCairoContext(cr);
PangoLayout* layout = pango_cairo_create_layout(cr);
cairo_set_source_rgb(cr,
SkColorGetR(color) / 255.0,
SkColorGetG(color) / 255.0,
SkColorGetB(color) / 255.0);
// TODO(deanm): Implement the rest of the Canvas flags.
if (!(flags & Canvas::NO_ELLIPSIS))
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
pango_layout_set_width(layout, w * PANGO_SCALE);
pango_layout_set_height(layout, h * PANGO_SCALE);
if (flags & TEXT_ALIGN_CENTER) {
pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
} else if (flags & TEXT_ALIGN_RIGHT) {
pango_layout_set_alignment(layout, PANGO_ALIGN_RIGHT);
}
if (flags & MULTI_LINE) {
pango_layout_set_wrap(layout,
(flags & CHARACTER_BREAK) ? PANGO_WRAP_WORD_CHAR : PANGO_WRAP_WORD);
}
if (flags & NO_ELLIPSIS)
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
std::string utf8 = WideToUTF8(text);
pango_layout_set_text(layout, utf8.data(), utf8.size());
PangoFontDescription* desc = PangoFontFromGfxFont(font);
pango_layout_set_font_description(layout, desc);
pango_font_description_free(desc);
int width, height;
pango_layout_get_size(layout, &width, &height);
if (flags & Canvas::TEXT_VALIGN_TOP) {
// Cairo should draw from the top left corner already.
} else if (flags & Canvas::TEXT_VALIGN_BOTTOM) {
y = y + (h - (height / PANGO_SCALE));
} else {
// Vertically centered.
y = y + ((h - (height / PANGO_SCALE)) / 2);
}
cairo_move_to(cr, x, y);
pango_cairo_show_layout(cr, layout);
g_object_unref(layout);
cairo_destroy(cr);
// NOTE: beginPlatformPaint returned its surface, we shouldn't destroy it.
}
} // namespace gfx
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