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Calculate font size correctly

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This commit is contained in:
teinarss
2019-05-02 19:44:15 +02:00
committed by reaperrr
parent 7c71e55b01
commit 2d1c110857
3 changed files with 34 additions and 4 deletions
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24
OpenRA.Platforms.Default/FreeTypeFont.cs
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@@ -27,6 +27,11 @@ namespace OpenRA.Platforms.Default
internal const int FT_LOAD_RENDER = 0x04;
internal static readonly int FaceRecGlyphOffset = IntPtr.Size == 8 ? 152 : 84; // offsetof(FT_FaceRec, glyph)
internal static readonly int FaceRecSizeOffset = IntPtr.Size == 8 ? 160 : 88; // offsetof(FT_FaceRec, size)
internal static readonly int SizeRecMetricsOffset = IntPtr.Size == 8 ? 24 : 12; // offsetof(FT_SizeRec, metrics)
internal static readonly int SizeMetricsAscenderOffset = IntPtr.Size == 8 ? 24 : 12; // offsetof(FT_Size_Metrics, ascender)
internal static readonly int SizeMetricsDescenderOffset = IntPtr.Size == 8 ? 32 : 16; // offsetof(FT_Size_Metrics, descender)
internal static readonly int GlyphSlotMetricsOffset = IntPtr.Size == 8 ? 48 : 24; // offsetof(FT_GlyphSlotRec, metrics)
internal static readonly int GlyphSlotBitmapOffset = IntPtr.Size == 8 ? 152 : 76; // offsetof(FT_GlyphSlotRec, bitmap)
internal static readonly int GlyphSlotBitmapLeftOffset = IntPtr.Size == 8 ? 192 : 100; // offsetof(FT_GlyphSlotRec, bitmap_left)
@@ -68,6 +73,8 @@ namespace OpenRA.Platforms.Default
readonly IntPtr face;
bool disposed;
public int Height { get; private set; }
public FreeTypeFont(byte[] data)
{
if (library == IntPtr.Zero && FreeType.FT_Init_FreeType(out library) != FreeType.OK)
@@ -78,12 +85,25 @@ namespace OpenRA.Platforms.Default
throw new InvalidDataException("Failed to initialize font");
}
public FontGlyph CreateGlyph(char c, int size, float deviceScale)
public void SetSize(int size, float deviceScale)
{
var scaledSize = (uint)(size * deviceScale);
if (FreeType.FT_Set_Pixel_Sizes(face, scaledSize, scaledSize) != FreeType.OK)
return EmptyGlyph;
throw new InvalidDataException("Failed to set size");
var faceSize = Marshal.ReadIntPtr(IntPtr.Add(face, FreeType.FaceRecSizeOffset)); // face->size
var metrics = IntPtr.Add(faceSize, FreeType.SizeRecMetricsOffset); // face->size->metrics
var ascender = Marshal.ReadIntPtr(IntPtr.Add(metrics, FreeType.SizeMetricsAscenderOffset)); // face->size->metrics.ascender
var descender = Marshal.ReadIntPtr(IntPtr.Add(metrics, FreeType.SizeMetricsDescenderOffset)); // face->size->metrics.descender
var ascenderValue = (int)ascender >> 6;
var descenderValue = (int)descender >> 6;
Height = (int)((ascenderValue - Math.Abs(descenderValue)) / deviceScale);
}
public FontGlyph CreateGlyph(char c)
{
if (FreeType.FT_Load_Char(face, c, FreeType.FT_LOAD_RENDER) != FreeType.OK)
return EmptyGlyph;