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macOS: Fix a regression in the previous release that caused junk to be rendered in font previews in the choose fonts kitten and crash on Intel macs

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Fixes #7892
This commit is contained in:
Kovid Goyal
2024-09-26 01:44:14 +05:30
parent 866c14249b
commit 6834e366be
2 changed files with 8 additions and 5 deletions
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11
kitty/core_text.m
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@@ -813,13 +813,13 @@ render_sample_text(CTFace *self, PyObject *args) {
if (!PyArg_ParseTuple(args, "Ukk|k", &ptext, &canvas_width, &canvas_height, &fg)) return NULL;
unsigned int cell_width, cell_height, baseline, underline_position, underline_thickness, strikethrough_position, strikethrough_thickness;
cell_metrics((PyObject*)self, &cell_width, &cell_height, &baseline, &underline_position, &underline_thickness, &strikethrough_position, &strikethrough_thickness);
RAII_PyObject(pbuf, PyBytes_FromStringAndSize(NULL, sizeof(pixel) * canvas_width * canvas_height));
if (!pbuf) return NULL;
memset(PyBytes_AS_STRING(pbuf), 0, PyBytes_GET_SIZE(pbuf));
if (!cell_width || !cell_height) return Py_BuildValue("OII", pbuf, cell_width, cell_height);
if (!cell_width || !cell_height) return Py_BuildValue("yII", "", cell_width, cell_height);
size_t num_chars = PyUnicode_GET_LENGTH(ptext);
int num_chars_per_line = canvas_width / cell_width, num_of_lines = (int)ceil((float)num_chars / (float)num_chars_per_line);
canvas_height = MIN(canvas_height, num_of_lines * cell_height);
RAII_PyObject(pbuf, PyBytes_FromStringAndSize(NULL, sizeof(pixel) * canvas_width * canvas_height));
if (!pbuf) return NULL;
memset(PyBytes_AS_STRING(pbuf), 0, PyBytes_GET_SIZE(pbuf));
__attribute__((cleanup(destroy_hb_buffer))) hb_buffer_t *hb_buffer = hb_buffer_create();
if (!hb_buffer_pre_allocate(hb_buffer, 4*num_chars)) { PyErr_NoMemory(); return NULL; }
@@ -858,9 +858,10 @@ render_sample_text(CTFace *self, PyObject *args) {
render_glyphs(font, canvas_width, canvas_height, baseline, num_glyphs);
uint8_t r = (fg >> 16) & 0xff, g = (fg >> 8) & 0xff, b = fg & 0xff;
const uint8_t *last_pixel = (uint8_t*)PyBytes_AS_STRING(pbuf) + PyBytes_GET_SIZE(pbuf) - sizeof(pixel);
const uint8_t *s_limit = buffers.render_buf + canvas_width * canvas_height;
for (
uint8_t *p = (uint8_t*)PyBytes_AS_STRING(pbuf), *s = buffers.render_buf;
p <= last_pixel;
p <= last_pixel && s < s_limit;
p += sizeof(pixel), s++
) {
p[0] = r; p[1] = g; p[2] = b; p[3] = s[0];