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Fix bug causing abort when glyph count was zero 

Solve github's issue https://github.com/franko/lite-xl/issues/75
This commit is contained in:
Francesco Abbate 2021-03-03 18:00:19 +01:00
parent de13762085
commit bdc473435b
1 changed files with 26 additions and 8 deletions
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34
lib/font_renderer/font_renderer.cpp
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@ -188,8 +188,14 @@ FR_Bitmap *FR_Bake_Font_Bitmap(FR_Renderer *font_renderer, int font_height,
#endif
renderer_alpha.set_font_height(font_height_reduced);
int *index = new int[num_chars];
agg::rect_i *bounds = new agg::rect_i[num_chars];
int *index = (int *) malloc(num_chars * sizeof(int));
agg::rect_i *bounds = (agg::rect_i *) malloc(num_chars * sizeof(agg::rect_i));
if (!index || !bounds) {
free(index);
free(bounds);
return NULL;
}
int x_size_sum = 0, glyph_count = 0;
for (int i = 0; i < num_chars; i++) {
int codepoint = first_char + i;
@ -221,8 +227,7 @@ FR_Bitmap *FR_Bake_Font_Bitmap(FR_Renderer *font_renderer, int font_height,
i = i + 1;
}
if (glyph_count == 0) return NULL;
const int pixels_width = (x_size_sum / glyph_count) * 16;
const int pixels_width = glyph_count > 0 ? (x_size_sum / glyph_count) * 16 : 12;
// dry run simulating pixel position to estimate required image's height
int x = x_start, y = 0, y_bottom = y;
@ -238,15 +243,27 @@ FR_Bitmap *FR_Bake_Font_Bitmap(FR_Renderer *font_renderer, int font_height,
x = x + gbounds.x2 + 2 * subpixel_scale;
}
agg::int8u *cover_swap_buffer = (agg::int8u *) malloc(sizeof(agg::int8u) * (pixels_width * subpixel_scale));
if (!cover_swap_buffer) {
free(index);
free(bounds);
return NULL;
}
const int pixels_height = -y_bottom + 1;
const int pixel_size = 1;
FR_Bitmap *image = FR_Bitmap_New(font_renderer, pixels_width, pixels_height);
if (!image) {
free(index);
free(bounds);
free(cover_swap_buffer);
return NULL;
}
agg::int8u *pixels = image->pixels;
memset(pixels, 0x00, pixels_width * pixels_height * subpixel_scale * pixel_size);
agg::rendering_buffer ren_buf(pixels, pixels_width * subpixel_scale, pixels_height, -pixels_width * subpixel_scale * pixel_size);
agg::int8u *cover_swap_buffer = new agg::int8u[pixels_width * subpixel_scale];
// The variable y_bottom will be used to go down to the next row by taking into
// account the space occupied by each glyph of the current row along the y direction.
x = x_start;
@ -293,9 +310,10 @@ FR_Bitmap *FR_Bake_Font_Bitmap(FR_Renderer *font_renderer, int font_height,
// When subpixel is activated we need one padding pixel on the left and on the right.
x = x + gbounds.x2 + 2 * subpixel_scale;
}
delete [] index;
delete [] bounds;
delete [] cover_swap_buffer;
free(index);
free(bounds);
free(cover_swap_buffer);
return image;
}