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Cleanup: split BLF glyph rendering into a function 

This makes the drawing loop easier to follow.
This commit is contained in:
Campbell Barton 2022-10-06 16:20:43 +11:00
parent 6fac4bb8b0
commit c2c31afa92
1 changed files with 110 additions and 99 deletions
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209
source/blender/blenfont/intern/blf_font.c
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@ -498,6 +498,115 @@ int blf_font_draw_mono(FontBLF *font, const char *str, const size_t str_len, int
/** \name Text Drawing: Buffer
* \{ */
/**
* Draw glyph `g` into `buf_info` pixels.
*/
static void blf_glyph_draw_buffer(FontBufInfoBLF *buf_info,
GlyphBLF *g,
const ft_pix pen_x,
const ft_pix pen_y_basis)
{
const int chx = ft_pix_to_int(pen_x + ft_pix_from_int(g->pos[0]));
const int chy = ft_pix_to_int(pen_y_basis + ft_pix_from_int(g->dims[1]));
ft_pix pen_y = (g->pitch < 0) ? (pen_y_basis + ft_pix_from_int(g->dims[1] - g->pos[1])) :
(pen_y_basis - ft_pix_from_int(g->dims[1] - g->pos[1]));
if ((chx + g->dims[0]) < 0 || /* Out of bounds: left. */
chx >= buf_info->dims[0] || /* Out of bounds: right. */
(ft_pix_to_int(pen_y) + g->dims[1]) < 0 || /* Out of bounds: bottom. */
ft_pix_to_int(pen_y) >= buf_info->dims[1] /* Out of bounds: top. */
) {
return;
}
/* Don't draw beyond the buffer bounds. */
int width_clip = g->dims[0];
int height_clip = g->dims[1];
int yb_start = g->pitch < 0 ? 0 : g->dims[1] - 1;
if (width_clip + chx > buf_info->dims[0]) {
width_clip -= chx + width_clip - buf_info->dims[0];
}
if (height_clip + ft_pix_to_int(pen_y) > buf_info->dims[1]) {
height_clip -= ft_pix_to_int(pen_y) + height_clip - buf_info->dims[1];
}
/* Clip drawing below the image. */
if (pen_y < 0) {
yb_start += (g->pitch < 0) ? -ft_pix_to_int(pen_y) : ft_pix_to_int(pen_y);
height_clip += ft_pix_to_int(pen_y);
pen_y = 0;
}
/* Avoid conversions in the pixel writing loop. */
const int pen_y_px = ft_pix_to_int(pen_y);
const float *b_col_float = buf_info->col_float;
const uchar *b_col_char = buf_info->col_char;
if (buf_info->fbuf) {
int yb = yb_start;
for (int y = ((chy >= 0) ? 0 : -chy); y < height_clip; y++) {
for (int x = ((chx >= 0) ? 0 : -chx); x < width_clip; x++) {
const char a_byte = *(g->bitmap + x + (yb * g->pitch));
if (a_byte) {
const float a = (a_byte / 255.0f) * b_col_float[3];
const size_t buf_ofs = (((size_t)(chx + x) +
((size_t)(pen_y_px + y) * (size_t)buf_info->dims[0])) *
(size_t)buf_info->ch);
float *fbuf = buf_info->fbuf + buf_ofs;
float font_pixel[4];
font_pixel[0] = b_col_float[0] * a;
font_pixel[1] = b_col_float[1] * a;
font_pixel[2] = b_col_float[2] * a;
font_pixel[3] = a;
blend_color_mix_float(fbuf, fbuf, font_pixel);
}
}
if (g->pitch < 0) {
yb++;
}
else {
yb--;
}
}
}
if (buf_info->cbuf) {
int yb = yb_start;
for (int y = ((chy >= 0) ? 0 : -chy); y < height_clip; y++) {
for (int x = ((chx >= 0) ? 0 : -chx); x < width_clip; x++) {
const char a_byte = *(g->bitmap + x + (yb * g->pitch));
if (a_byte) {
const float a = (a_byte / 255.0f) * b_col_float[3];
const size_t buf_ofs = (((size_t)(chx + x) +
((size_t)(pen_y_px + y) * (size_t)buf_info->dims[0])) *
(size_t)buf_info->ch);
uchar *cbuf = buf_info->cbuf + buf_ofs;
uchar font_pixel[4];
font_pixel[0] = b_col_char[0];
font_pixel[1] = b_col_char[1];
font_pixel[2] = b_col_char[2];
font_pixel[3] = unit_float_to_uchar_clamp(a);
blend_color_mix_byte(cbuf, cbuf, font_pixel);
}
}
if (g->pitch < 0) {
yb++;
}
else {
yb--;
}
}
}
}
/* Sanity checks are done by BLF_draw_buffer() */
static void blf_font_draw_buffer_ex(FontBLF *font,
GlyphCacheBLF *gc,
@ -513,10 +622,6 @@ static void blf_font_draw_buffer_ex(FontBLF *font,
/* buffer specific vars */
FontBufInfoBLF *buf_info = &font->buf_info;
const float *b_col_float = buf_info->col_float;
const uchar *b_col_char = buf_info->col_char;
int chx, chy;
int y, x;
/* another buffer specific call for color conversion */
@ -528,101 +633,7 @@ static void blf_font_draw_buffer_ex(FontBLF *font,
}
pen_x += blf_kerning(font, g_prev, g);
chx = ft_pix_to_int(pen_x + ft_pix_from_int(g->pos[0]));
chy = ft_pix_to_int(pen_y_basis + ft_pix_from_int(g->dims[1]));
if (g->pitch < 0) {
pen_y = pen_y_basis + ft_pix_from_int(g->dims[1] - g->pos[1]);
}
else {
pen_y = pen_y_basis - ft_pix_from_int(g->dims[1] - g->pos[1]);
}
if ((chx + g->dims[0]) >= 0 && chx < buf_info->dims[0] &&
(ft_pix_to_int(pen_y) + g->dims[1]) >= 0 && ft_pix_to_int(pen_y) < buf_info->dims[1]) {
/* don't draw beyond the buffer bounds */
int width_clip = g->dims[0];
int height_clip = g->dims[1];
int yb_start = g->pitch < 0 ? 0 : g->dims[1] - 1;
if (width_clip + chx > buf_info->dims[0]) {
width_clip -= chx + width_clip - buf_info->dims[0];
}
if (height_clip + ft_pix_to_int(pen_y) > buf_info->dims[1]) {
height_clip -= ft_pix_to_int(pen_y) + height_clip - buf_info->dims[1];
}
/* drawing below the image? */
if (pen_y < 0) {
yb_start += (g->pitch < 0) ? -ft_pix_to_int(pen_y) : ft_pix_to_int(pen_y);
height_clip += ft_pix_to_int(pen_y);
pen_y = 0;
}
/* Avoid conversions in the pixel writing loop. */
const int pen_y_px = ft_pix_to_int(pen_y);
if (buf_info->fbuf) {
int yb = yb_start;
for (y = ((chy >= 0) ? 0 : -chy); y < height_clip; y++) {
for (x = ((chx >= 0) ? 0 : -chx); x < width_clip; x++) {
const char a_byte = *(g->bitmap + x + (yb * g->pitch));
if (a_byte) {
const float a = (a_byte / 255.0f) * b_col_float[3];
const size_t buf_ofs = (((size_t)(chx + x) +
((size_t)(pen_y_px + y) * (size_t)buf_info->dims[0])) *
(size_t)buf_info->ch);
float *fbuf = buf_info->fbuf + buf_ofs;
float font_pixel[4];
font_pixel[0] = b_col_float[0] * a;
font_pixel[1] = b_col_float[1] * a;
font_pixel[2] = b_col_float[2] * a;
font_pixel[3] = a;
blend_color_mix_float(fbuf, fbuf, font_pixel);
}
}
if (g->pitch < 0) {
yb++;
}
else {
yb--;
}
}
}
if (buf_info->cbuf) {
int yb = yb_start;
for (y = ((chy >= 0) ? 0 : -chy); y < height_clip; y++) {
for (x = ((chx >= 0) ? 0 : -chx); x < width_clip; x++) {
const char a_byte = *(g->bitmap + x + (yb * g->pitch));
if (a_byte) {
const float a = (a_byte / 255.0f) * b_col_float[3];
const size_t buf_ofs = (((size_t)(chx + x) +
((size_t)(pen_y_px + y) * (size_t)buf_info->dims[0])) *
(size_t)buf_info->ch);
uchar *cbuf = buf_info->cbuf + buf_ofs;
uchar font_pixel[4];
font_pixel[0] = b_col_char[0];
font_pixel[1] = b_col_char[1];
font_pixel[2] = b_col_char[2];
font_pixel[3] = unit_float_to_uchar_clamp(a);
blend_color_mix_byte(cbuf, cbuf, font_pixel);
}
}
if (g->pitch < 0) {
yb++;
}
else {
yb--;
}
}
}
}
blf_glyph_draw_buffer(buf_info, g, pen_x, pen_y_basis);
pen_x = ft_pix_round_advance(pen_x, g->advance_x);
g_prev = g;