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Found a working condition but some details needs attention

This commit is contained in:
Francesco Abbate 2020-06-05 17:32:36 +02:00
parent 2e2db2d690
commit ad8cdf2b92
1 changed files with 45 additions and 19 deletions
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64
lib/font_renderer/font_renderer.cpp
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@ -123,24 +123,56 @@ static void glyph_trim_rect(agg::rendering_buffer& ren_buf, GlyphBitmapInfo& gli
gli.y1 = y1;
}
static void glyph_lut_convolution(agg::rendering_buffer ren_buf, agg::lcd_distribution_lut& lcd_lut, GlyphBitmapInfo& gli) {
static void debug_print_covers(const char *msg, agg::int8u *b, int n_pre, int n, int n_post) {
fprintf(stderr, "%s", msg);
for (int i = 0; i < n_pre; i++) {
if (i % 3 == 0) fprintf(stderr, "|");
fprintf(stderr, " ");
}
for (int i = 0; i < n; i++) {
if (i % 3 == 0) fprintf(stderr, "|");
fprintf(stderr, " %02x", b[i]);
}
for (int i = 0; i < n_post; i++) {
if (i % 3 == 0) fprintf(stderr, "|");
fprintf(stderr, " ");
}
fprintf(stderr, "\n");
}
static void glyph_lut_convolution(agg::rendering_buffer ren_buf, agg::lcd_distribution_lut& lcd_lut, agg::int8u *covers_buf, GlyphBitmapInfo& gli) {
const int subpixel = 3;
const int x0 = gli.x0, y0 = gli.y0, x1 = gli.x1, y1 = gli.y1;
const int len = (x1 - x0) * subpixel;
const int height = ren_buf.height();
agg::int8u *covers_buf = new agg::int8u[len + 2 * subpixel];
memset(covers_buf, 0, len + 2 * subpixel);
for (int y = y0; y < y1; y++) {
agg::int8u *covers = ren_buf.row_ptr(height - 1 - y) + x0 * subpixel;
// FIXME: clarify why we do not use height - 1 below.
agg::int8u *covers = ren_buf.row_ptr(height - y) + x0 * subpixel;
memcpy(covers_buf + subpixel, covers, len);
#if 0
if (len >= 24) {
debug_print_covers("BUF ", covers_buf, 0, len + 2 * subpixel, 0);
debug_print_covers("BEFORE", covers - subpixel, 0, len + 2 * subpixel, 0);
}
#endif
for (int x = x0 - 1; x < x1 + 1; x++) {
for (int i = 0; i < subpixel; i++) {
const int cx = (x - x0) * subpixel + i;
covers[cx] = lcd_lut.convolution(covers_buf + subpixel, cx, -2, len + 2 - 1);
covers[cx] = lcd_lut.convolution(covers_buf + subpixel, cx, 0, len - 1);
}
}
#if 0
if (len >= 24) {
debug_print_covers("AFTER ", covers - subpixel, 0, len + 2 * subpixel, 0);
char c;
scanf("%c", &c);
}
#endif
}
delete [] covers_buf;
gli.x0 -= 1;
gli.x1 += 1;
gli.xoff -= 1;
}
static int ceil_to_multiple(int n, int p) {
@ -197,20 +229,22 @@ int FontRendererBakeFontBitmap(FontRenderer *font_renderer, int font_height,
// Below x and x_next_i will always be integer multiples of subpixel_scale.
GlyphBitmapInfo& glyph_info = glyphs[i];
glyph_info.x0 = x / subpixel_scale;
glyph_info.y0 = pixels_height - 1 - (y_baseline + ascender_px + pad_y); // FIXME: add -1 ?
glyph_info.y0 = pixels_height - (y_baseline + ascender_px + pad_y); // FIXME: add -1 ?
glyph_info.x1 = x_next_i / subpixel_scale;
glyph_info.y1 = pixels_height - 1 - (y_baseline + descender_px - pad_y); // FIXME: add -1 ?
glyph_info.y1 = pixels_height - (y_baseline + descender_px - pad_y); // FIXME: add -1 ?
glyph_info.xoff = 0;
glyph_info.yoff = -pad_y;
glyph_info.xadvance = (x_next - x) / subpixel_scale;
glyph_lut_convolution(ren_buf, lcd_lut, glyph_info);
if (glyph_info.x1 > glyph_info.x0) {
agg::int8u *covers_buf = ren_buf.row_ptr(0);
glyph_lut_convolution(ren_buf, lcd_lut, covers_buf, glyph_info);
}
glyph_trim_rect(ren_buf, glyph_info, subpixel_scale);
// FIXME: check if we don't need to add to x.
// When subpixel is activated we need at least two more subpixels on the right.
x = x_next_i;
x = x_next_i + 2 * subpixel_scale;
}
return res;
}
@ -246,14 +280,7 @@ void blend_solid_hspan(agg::rendering_buffer& rbuf, blender_gamma_type& blender,
while(--len);
}
}
#if 0
static int floor_div(int a, int b) {
if (a < 0) {
return -((-a + b - 1) / b);
}
return a / b;
}
#endif
void blend_solid_hspan_rgb_subpixel(agg::rendering_buffer& rbuf, agg::gamma_lut<>& gamma, agg::lcd_distribution_lut& lcd_lut,
int x, int y, unsigned len,
const agg::rgba8& c,
@ -272,7 +299,6 @@ void blend_solid_hspan_rgb_subpixel(agg::rendering_buffer& rbuf, agg::gamma_lut<
{
for (int i = 0; i < 3; i++) {
int cx = xp * 3 - x + i;
// unsigned c_conv = lcd_lut.convolution(covers, new_cx, 0, len - 1);
unsigned cover_value = covers[cx];
unsigned alpha = (cover_value + 1) * (c.a + 1);
unsigned dst_col = gamma.dir(rgb[i]);