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Refactor the cell rendering code for greater re-use

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Also start work on CoreText based rendering
This commit is contained in:
Kovid Goyal
2017-01-11 12:02:28 +05:30
parent 282d6faa5f
commit dff91759a2
6 changed files with 204 additions and 81 deletions
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84
kitty/core_text.m
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@@ -8,6 +8,8 @@
#include "data-types.h"
#include <structmember.h>
#include <stdint.h>
#include <math.h>
#import <CoreGraphics/CGBitmapContext.h>
#import <CoreText/CTFont.h>
#import <Foundation/NSString.h>
#import <Foundation/NSDictionary.h>
@@ -62,6 +64,7 @@ new(PyTypeObject *type, PyObject *args, PyObject UNUSED *kwds) {
self->underline_thickness = CTFontGetUnderlineThickness(self->font);
self->family_name = convert_cfstring(CTFontCopyFamilyName(self->font));
self->full_name = convert_cfstring(CTFontCopyFullName(self->font));
self->scaled_point_sz = CTFontGetSize(self->font);
if (self->family_name == NULL || self->full_name == NULL) { Py_CLEAR(self); }
}
} else {
@@ -104,6 +107,84 @@ has_char(Face *self, PyObject *args) {
return ret;
}
static PyObject*
font_units_to_pixels(Face *self, PyObject *args) {
#define font_units_to_pixels_doc "Convert the specified value from font units to pixels at the current font size"
double x;
if (!PyArg_ParseTuple(args, "d", &x)) return NULL;
x *= self->scaled_point_sz / self->units_per_em;
return Py_BuildValue("i", (int)ceil(x));
}
static PyObject*
cell_size(Face *self) {
#define cell_size_doc "Return the best cell size for this font based on the advances for the ASCII chars from 32 to 127"
#define count (128 - 32)
unichar chars[count+1] = {0};
CGGlyph glyphs[count+1] = {0};
for (int i = 0; i < count; i++) chars[i] = 32 + i;
CTFontGetGlyphsForCharacters(self->font, chars, glyphs, count);
CGSize advances[1] = {0};
unsigned int width = 0, w;
for (int i = 0; i < count; i++) {
if (glyphs[i]) {
CTFontGetAdvancesForGlyphs(self->font, kCTFontHorizontalOrientation, glyphs+1, advances, 1);
w = (unsigned int)(ceilf(advances[0].width));
if (w > width) width = w;
}
}
return Py_BuildValue("I", width + 2); // + 2 for antialiasing which needs pixels on either side
#undef count
}
static PyObject*
render_char(Face *self, PyObject *args) {
#define render_char_doc ""
char *s;
unsigned int width, height;
PyObject *pbuf;
CGColorSpaceRef color_space = NULL;
CGContextRef ctx = NULL;
CTFontRef font = NULL;
if (!PyArg_ParseTuple(args, "esIIO!", "UTF-8", &s, &width, &height, &PyLong_Type, &pbuf)) return NULL;
uint8_t *buf = (uint8_t*)PyLong_AsVoidPtr(pbuf);
CFStringRef str = CFStringCreateWithCString(NULL, s, kCFStringEncodingUTF8);
if (!str) return PyErr_NoMemory();
CGGlyph glyphs[10] = {0};
unichar chars[10] = {0};
CFRange range = CFRangeMake(0, CFStringGetLength(str));
CFStringGetCharacters(str, range, chars);
font = CTFontCreateForString(self->font, str, range);
if (font == NULL) { PyErr_SetString(PyExc_ValueError, "Failed to find fallback font"); goto end; }
CTFontGetGlyphsForCharacters(font, chars, glyphs, range.length);
color_space = CGColorSpaceCreateDeviceGray();
if (color_space == NULL) { PyErr_NoMemory(); goto end; }
ctx = CGBitmapContextCreate(buf, width, height, 8, width, color_space, (kCGBitmapAlphaInfoMask & kCGImageAlphaNone));
if (ctx == NULL) { PyErr_SetString(PyExc_ValueError, "Failed to create bitmap context"); goto end; }
CGContextSetShouldAntialias(ctx, true);
CGContextSetShouldSmoothFonts(ctx, true); // sub-pixel antialias
CGContextSetRGBFillColor(ctx, 1, 1, 1, 1); // white glyphs
CGAffineTransform transform = CGAffineTransformIdentity;
CGContextSetTextDrawingMode(ctx, kCGTextFill);
CGGlyph glyph = glyphs[0];
if (glyph) {
CGRect rect = CTFontGetBoundingRectsForGlyphs(font, kCTFontHorizontalOrientation, glyphs, 0, 1);
// TODO: Scale the glyph if its bbox is larger than the image by using a non-identity transform
CGContextSetTextMatrix(ctx, transform);
CGFloat pos_x = -rect.origin.x + 1, pos_y = height - rect.origin.y - rect.size.height;
CGContextSetTextPosition(ctx, pos_x, pos_y);
CTFontDrawGlyphs(font, &glyph, &CGPointZero, 1, ctx);
}
end:
CFRelease(str);
if (ctx) CGContextRelease(ctx);
if (color_space) CGColorSpaceRelease(color_space);
if (font && font != self->font) CFRelease(font);
if (PyErr_Occurred()) return NULL;
Py_RETURN_NONE;
}
// Boilerplate {{{
static PyMemberDef members[] = {
@@ -123,6 +204,9 @@ static PyMemberDef members[] = {
static PyMethodDef methods[] = {
METHOD(has_char, METH_VARARGS)
METHOD(cell_size, METH_NOARGS)
METHOD(font_units_to_pixels, METH_VARARGS)
METHOD(render_char, METH_VARARGS)
{NULL} /* Sentinel */
};