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LibGfx: Update Painter's bezier curve drawing algorithm.

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The new algorithm is an iterative one with an arbitrary threshold for splitting
curves. It splits curves evenly. This should theoretically be less accurate
than the existing recursive approach, but seems to give subjectively better
results in practice.
This commit is contained in:
Srimanta Barua 2020-06-06 15:31:34 +05:30 • committed by Andreas Kling
parent 0e9fb803c8
commit 186499cc25
3 changed files with 69 additions and 164 deletions
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28
Libraries/LibGfx/TTFont.h
View file

@ -31,30 +31,12 @@
#include <AK/OwnPtr.h>
#include <AK/RefCounted.h>
#include <AK/StringView.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Size.h>
namespace Gfx {
namespace TTF {
class AABitmap {
public:
AABitmap(Size size)
: m_size(size)
{
m_data = OwnPtr(new u8[size.width() * size.height()]);
}
Size size() const { return m_size; }
u8 byte_at(int x, int y) const { return m_data[y * m_size.width() + x]; }
void set_byte_at(int x, int y, u8 value)
{
m_data[y * m_size.width() + x] = value;
}
private:
Size m_size;
OwnPtr<u8> m_data;
};
class ScaledFont;
struct ScaledFontMetrics {
@ -86,7 +68,7 @@ private:
Font(ByteBuffer&& buffer, u32 offset);
ScaledFontMetrics metrics(float x_scale, float y_scale) const;
ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const;
AABitmap raster_glyph(u32 glyph_id, float x_scale, float y_scale) const;
RefPtr<Bitmap> raster_glyph(u32 glyph_id, float x_scale, float y_scale) const;
u32 glyph_count() const { return m_maxp.num_glyphs(); }
enum class IndexToLocFormat {
@ -262,7 +244,7 @@ private:
public:
static Glyph simple(const ByteBuffer& slice, u16 num_contours, i16 xmin, i16 ymin, i16 xmax, i16 ymax);
static Glyph composite(const ByteBuffer& slice); // FIXME: This is currently just a dummy. Need to add support for composite glyphs.
AABitmap raster(float x_scale, float y_scale) const;
RefPtr<Bitmap> raster(float x_scale, float y_scale) const;
int ascender() const
{
if (m_type == Type::Simple) {
@ -302,7 +284,7 @@ private:
, m_slice(move(slice))
{
}
AABitmap raster_simple(float x_scale, float y_scale) const;
RefPtr<Bitmap> raster_simple(float x_scale, float y_scale) const;
Type m_type;
ByteBuffer m_slice;
@ -347,7 +329,7 @@ public:
u32 glyph_id_for_codepoint(u32 codepoint) const { return m_font->m_cmap.glyph_id_for_codepoint(codepoint); }
ScaledFontMetrics metrics() const { return m_font->metrics(m_x_scale, m_y_scale); }
ScaledGlyphMetrics glyph_metrics(u32 glyph_id) const { return m_font->glyph_metrics(glyph_id, m_x_scale, m_y_scale); }
AABitmap raster_glyph(u32 glyph_id) const { return m_font->raster_glyph(glyph_id, m_x_scale, m_y_scale); }
RefPtr<Bitmap> raster_glyph(u32 glyph_id) const { return m_font->raster_glyph(glyph_id, m_x_scale, m_y_scale); }
u32 glyph_count() const { return m_font->glyph_count(); }
int width(const StringView&) const;
int width(const Utf8View&) const;