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apple: fix coretext bounds checking

This commit is contained in:
Eric Warmenhoven 2025-07-11 11:56:56 -04:00
parent 2dbb9f62d8
commit 4bdb68b9d9
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1 changed files with 27 additions and 9 deletions
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36
gfx/drivers_font_renderer/coretext.c
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@ -229,16 +229,34 @@ static bool coretext_font_renderer_render_glyph(CTFontRef face, ct_font_renderer
slot->glyph.atlas_offset_x +
slot->glyph.atlas_offset_y * handle->atlas.width;
/* Draw 2-pixel border rectangle */
for (r = 2; r < slot->glyph.height - 2; r++)
/* Only draw rectangle if glyph is large enough and within atlas bounds */
if (slot->glyph.width >= 6 && slot->glyph.height >= 6)
{
dst[r * handle->atlas.width + 2] = 255; /* Left */
dst[r * handle->atlas.width + slot->glyph.width - 3] = 255; /* Right */
}
for (c = 2; c < slot->glyph.width - 2; c++)
{
dst[2 * handle->atlas.width + c] = 255; /* Top */
dst[(slot->glyph.height - 3) * handle->atlas.width + c] = 255; /* Bottom */
unsigned max_r = slot->glyph.height - 2;
unsigned max_c = slot->glyph.width - 2;
int atlas_size = handle->atlas.width * handle->atlas.height;
/* Draw 2-pixel border rectangle */
for (r = 2; r < max_r; r++)
{
int left_pos = r * handle->atlas.width + 2;
int right_pos = r * handle->atlas.width + max_c - 1;
if (left_pos < atlas_size && right_pos < atlas_size)
{
dst[left_pos] = 255; /* Left */
dst[right_pos] = 255; /* Right */
}
}
for (c = 2; c < max_c; c++)
{
int top_pos = 2 * handle->atlas.width + c;
int bottom_pos = (max_r - 1) * handle->atlas.width + c;
if (top_pos < atlas_size && bottom_pos < atlas_size)
{
dst[top_pos] = 255; /* Top */
dst[bottom_pos] = 255; /* Bottom */
}
}
}
/* Set basic metrics using cached ascent */