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LibGfx: Rasterize simple TTF glyphs.

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This commit is contained in:
Srimanta Barua 2020-06-05 18:36:55 +05:30 • committed by Andreas Kling
parent e3b5d2afeb
commit b70c1fe181
2 changed files with 483 additions and 78 deletions
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62
Libraries/LibGfx/TTFont.h
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@ -27,17 +27,39 @@
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/Noncopyable.h>
#include <AK/OwnPtr.h>
#include <AK/StringView.h>
#include <LibGfx/Size.h>
namespace Gfx {
namespace TTF {
class Font;
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 Font {
AK_MAKE_NONCOPYABLE(Font);
public:
static OwnPtr<Font> load_from_file(const StringView& path, unsigned index);
AABitmap raster_codepoint(u32 codepoint, float x_scale, float y_scale) const;
private:
enum class IndexToLocFormat {
@ -48,8 +70,8 @@ private:
class Head {
public:
Head() {}
Head(ByteBuffer&& slice)
: m_slice(move(slice))
Head(const ByteBuffer& slice)
: m_slice(slice)
{
ASSERT(m_slice.size() >= 54);
}
@ -68,8 +90,8 @@ private:
class Hhea {
public:
Hhea() {}
Hhea(ByteBuffer&& slice)
: m_slice(move(slice))
Hhea(const ByteBuffer& slice)
: m_slice(slice)
{
ASSERT(m_slice.size() >= 36);
}
@ -82,8 +104,8 @@ private:
class Maxp {
public:
Maxp() {}
Maxp(ByteBuffer&& slice)
: m_slice(move(slice))
Maxp(const ByteBuffer& slice)
: m_slice(slice)
{
ASSERT(m_slice.size() >= 6);
}
@ -101,8 +123,8 @@ private:
class Hmtx {
public:
Hmtx() {}
Hmtx(ByteBuffer&& slice, u32 num_glyphs, u32 number_of_h_metrics)
: m_slice(move(slice))
Hmtx(const ByteBuffer& slice, u32 num_glyphs, u32 number_of_h_metrics)
: m_slice(slice)
, m_num_glyphs(num_glyphs)
, m_number_of_h_metrics(number_of_h_metrics)
{
@ -139,8 +161,8 @@ private:
UnicodeVariationSequences,
};
Subtable(ByteBuffer&& slice, u16 platform_id, u16 encoding_id)
: m_slice(move(slice))
Subtable(const ByteBuffer& slice, u16 platform_id, u16 encoding_id)
: m_slice(slice)
, m_raw_platform_id(platform_id)
, m_encoding_id(encoding_id)
{
@ -161,8 +183,8 @@ private:
};
Cmap() {}
Cmap(ByteBuffer&& slice)
: m_slice(move(slice))
Cmap(const ByteBuffer& slice)
: m_slice(slice)
{
ASSERT(m_slice.size() > 4);
}
@ -181,8 +203,8 @@ private:
class Loca {
public:
Loca() {}
Loca(ByteBuffer&& slice, u32 num_glyphs, IndexToLocFormat index_to_loc_format)
: m_slice(move(slice))
Loca(const ByteBuffer& slice, u32 num_glyphs, IndexToLocFormat index_to_loc_format)
: m_slice(slice)
, m_num_glyphs(num_glyphs)
, m_index_to_loc_format(index_to_loc_format)
{
@ -207,8 +229,9 @@ private:
public:
class Glyph {
public:
static Glyph simple(ByteBuffer&& slice, u16 num_contours, i16 xmin, i16 ymin, i16 xmax, i16 ymax);
static Glyph composite(ByteBuffer&& slice); // FIXME: This is currently just a dummy. Need to add support for composite glyphs.
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;
private:
enum class Type {
@ -225,11 +248,12 @@ private:
struct Composite {
};
Glyph(ByteBuffer&& slice, Type type)
Glyph(const ByteBuffer& slice, Type type)
: m_type(type)
, m_slice(move(slice))
{
}
AABitmap raster_simple(float x_scale, float y_scale) const;
Type m_type;
ByteBuffer m_slice;
@ -240,7 +264,7 @@ private:
};
Glyf() {}
Glyf(ByteBuffer&& slice)
Glyf(const ByteBuffer& slice)
: m_slice(move(slice))
{
}