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x.ttf: add missing doc strings to the module's public symbols (#23205)

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larpon 2024-12-19 13:32:41 +01:00 committed by GitHub
parent 570f84933c
commit 05cbbfbabc
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5 changed files with 81 additions and 29 deletions
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47
vlib/x/ttf/common.v
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@ -49,7 +49,7 @@ fn dprintln(txt string) {
* Utility
*
******************************************************************************/
// transform the bitmap from one layer to color layers
// format_texture transforms the bitmap from one layer to color layers
fn (mut bmp BitMap) format_texture() {
r := u8(bmp.color >> 24)
g := u8((bmp.color >> 16) & 0xFF)
@ -84,7 +84,7 @@ fn (mut bmp BitMap) format_texture() {
}
}
// write out a .ppm file
// save_as_ppm saves the `BitMap` data in .ppm file format to `file_name`.
pub fn (mut bmp BitMap) save_as_ppm(file_name string) {
tmp_buf := bmp.buf
mut buf := unsafe { malloc_noscan(bmp.buf_size) }
@ -114,6 +114,7 @@ pub fn (mut bmp BitMap) save_as_ppm(file_name string) {
bmp.buf = tmp_buf
}
// get_raw_bytes returns the raw bytes of the bitmap.
pub fn (mut bmp BitMap) get_raw_bytes() []u8 {
mut f_buf := []u8{len: bmp.buf_size / 4}
mut i := 0
@ -126,6 +127,7 @@ pub fn (mut bmp BitMap) get_raw_bytes() []u8 {
return f_buf
}
// save_raw_data saves the raw data to `file_name`.
pub fn (mut bmp BitMap) save_raw_data(file_name string) {
os.write_file_array(file_name, bmp.get_raw_bytes()) or { panic(err) }
}
@ -160,36 +162,39 @@ fn rfpart(x f32) f32 {
* Colors
*
******************************************************************************/
/*
@[inline]
pub fn (mut dev BitMap) get_color(x int, y int) (int, int, int, int){
if x < 0 || x >= dev.width || y < 0 || y >= dev.height {
return 0,0,0,0
}
mut i := (x + y * dev.width)*dev.bp
unsafe{
return dev.buf[i], dev.buf[i+1], dev.buf[i+2], dev.buf[i+3]
}
}
@[inline]
pub fn (mut dev BitMap) get_color_u32(x int, y int) u32{
r, g, b, a := dev.get_color(x, y)
unsafe{
return u32(r<<24) | u32(g<<16) | u32(b<<8) | u32(a)
}
}
*/
// @[inline]
// pub fn (mut dev BitMap) get_color(x int, y int) (int, int, int, int){
// if x < 0 || x >= dev.width || y < 0 || y >= dev.height {
// return 0,0,0,0
// }
// mut i := (x + y * dev.width)*dev.bp
// unsafe{
// return dev.buf[i], dev.buf[i+1], dev.buf[i+2], dev.buf[i+3]
// }
// }
// @[inline]
// pub fn (mut dev BitMap) get_color_u32(x int, y int) u32{
// r, g, b, a := dev.get_color(x, y)
// unsafe{
// return u32(r<<24) | u32(g<<16) | u32(b<<8) | u32(a)
// }
// }
/******************************************************************************
*
* Drawing
*
******************************************************************************/
// color_multiply_alpha multiplies color `c`'s alpha channel with the `level` value.
@[inline]
pub fn color_multiply_alpha(c u32, level f32) u32 {
return u32(f32(c & 0xFF) * level)
}
// color_multiply multiplies R,G,B channels of color `c` with the `level` value.
@[inline]
pub fn color_multiply(c u32, level f32) u32 {
mut r := (f32((c >> 24) & 0xFF) / 255.0) * level

29
vlib/x/ttf/render_bmp.v
View File

@ -16,6 +16,8 @@ module ttf
import encoding.utf8
import math
// BitMap represents a bitmap image of text rendered with the font supplied via
// the `tf` field.
pub struct BitMap {
pub mut:
tf &TTF_File = unsafe { nil }
@ -50,7 +52,7 @@ pub mut:
* Utility
*
******************************************************************************/
// clear clear the bitmap with 0 bytes
// clear clears the bitmap with 0 bytes.
pub fn (mut bmp BitMap) clear() {
mut sz := bmp.width * bmp.height * bmp.bp
unsafe {
@ -58,25 +60,25 @@ pub fn (mut bmp BitMap) clear() {
}
}
// transform matrix applied to the text
// trf_txt returns the transform matrix applied to the text.
pub fn (bmp &BitMap) trf_txt(p &Point) (int, int) {
return int(p.x * bmp.tr_matrix[0] + p.y * bmp.tr_matrix[3] + bmp.tr_matrix[6]), int(
p.x * bmp.tr_matrix[1] + p.y * bmp.tr_matrix[4] + bmp.tr_matrix[7])
}
// transform matrix applied to the char
// trf_ch returns the transform matrix applied to the char.
pub fn (bmp &BitMap) trf_ch(p &Point) (int, int) {
return int(p.x * bmp.ch_matrix[0] + p.y * bmp.ch_matrix[3] + bmp.ch_matrix[6]), int(
p.x * bmp.ch_matrix[1] + p.y * bmp.ch_matrix[4] + bmp.ch_matrix[7])
}
// set draw position in the buffer
// set_pos sets the draw position in the buffer
pub fn (mut bmp BitMap) set_pos(x f32, y f32) {
bmp.tr_matrix[6] = x
bmp.tr_matrix[7] = y
}
// set the rotation angle in radiants
// set_rotation sets the rotation angle in radians `a`
pub fn (mut bmp BitMap) set_rotation(a f32) {
bmp.tr_matrix[0] = f32(math.cos(a)) // 1
bmp.tr_matrix[1] = f32(-math.sin(a)) // 0
@ -89,6 +91,7 @@ pub fn (mut bmp BitMap) set_rotation(a f32) {
* Filler functions
*
******************************************************************************/
// init_filler initializes the internal `filler` buffer.
pub fn (mut bmp BitMap) init_filler() {
h := bmp.height - bmp.filler.len
if h < 1 {
@ -100,12 +103,14 @@ pub fn (mut bmp BitMap) init_filler() {
// dprintln("Init filler: ${bmp.filler.len} rows")
}
// clear_filler clears the internal `filler` buffer
pub fn (mut bmp BitMap) clear_filler() {
for i in 0 .. bmp.height {
bmp.filler[i].clear()
}
}
// exec_filler plots the pixels of the `BitMap` to the internal buffer.
pub fn (mut bmp BitMap) exec_filler() {
for y in 0 .. bmp.height {
if bmp.filler[y].len > 0 {
@ -131,6 +136,7 @@ pub fn (mut bmp BitMap) exec_filler() {
}
}
// fline populates the internal `filler` buffer with a line segment from `in_x0`,`in_y0` to `in_x1`,`in_y1`.
pub fn (mut bmp BitMap) fline(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32) {
mut x0 := f32(in_x0)
mut x1 := f32(in_x1)
@ -187,6 +193,8 @@ pub fn (mut bmp BitMap) fline(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32)
* Draw functions
*
******************************************************************************/
// plot plots a pixel at `x`,`y` in color `c` in the internal bitmap buffer.
@[inline]
pub fn (mut bmp BitMap) plot(x int, y int, c u32) bool {
if x < 0 || x >= bmp.width || y < 0 || y >= bmp.height {
@ -212,7 +220,7 @@ pub fn (mut bmp BitMap) plot(x int, y int, c u32) bool {
* smooth draw functions
*
******************************************************************************/
// aline draw an aliased line on the bitmap
// aline draws an aliased line on the bitmap
pub fn (mut bmp BitMap) aline(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32) {
// mut c1 := c
mut x0 := f32(in_x0)
@ -307,6 +315,7 @@ pub fn (mut bmp BitMap) aline(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32)
* draw functions
*
******************************************************************************/
// line plots a line segment to the internal buffer from `in_x0`,`in_y0` to `in_x1`,`in_y1` in the color `c`.
pub fn (mut bmp BitMap) line(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32) {
// outline with aliased borders
if bmp.style == .outline_aliased {
@ -387,6 +396,7 @@ pub fn (mut bmp BitMap) line(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32)
}
}
// box plots a (hollow) box to the internal buffer from top-left `in_x0`, `in_y0` to bottom right `in_x1`, `in_y1` in color `c`.
pub fn (mut bmp BitMap) box(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32) {
bmp.line(in_x0, in_y0, in_x1, in_y0, c)
bmp.line(in_x1, in_y0, in_x1, in_y1, c)
@ -394,6 +404,7 @@ pub fn (mut bmp BitMap) box(in_x0 int, in_y0 int, in_x1 int, in_y1 int, c u32) {
bmp.line(in_x0, in_y0, in_x0, in_y1, c)
}
// quadratic plots a quadratic Bezier curve in color `c`.
pub fn (mut bmp BitMap) quadratic(in_x0 int, in_y0 int, in_x1 int, in_y1 int, in_cx int, in_cy int, c u32) {
/*
x0 := int(in_x0 * bmp.scale)
@ -460,6 +471,7 @@ pub fn (mut bmp BitMap) quadratic(in_x0 int, in_y0 int, in_x1 int, in_y1 int, in
* TTF Query functions
*
******************************************************************************/
// get_chars_bbox returns all characters found in bounding box of string `in_string`.
pub fn (mut bmp BitMap) get_chars_bbox(in_string string) []int {
mut res := []int{}
mut w := 0
@ -532,6 +544,7 @@ pub fn (mut bmp BitMap) get_chars_bbox(in_string string) []int {
return res
}
// get_bbox returns the bounding box (width and height) of text `in_string`.
pub fn (mut bmp BitMap) get_bbox(in_string string) (int, int) {
mut w := 0
@ -627,6 +640,8 @@ fn (mut bmp BitMap) draw_notdef_glyph(in_x int, in_w int) {
bmp.line(int(x - in_w), int(y), int(x), int(y - y_h), bmp.color)
}
// draw_text plots the pixels of the text `in_string` to the internal buffer and
// returns the text bounding box.
pub fn (mut bmp BitMap) draw_text(in_string string) (int, int) {
mut w := 0
@ -702,6 +717,8 @@ pub fn (mut bmp BitMap) draw_text(in_string string) (int, int) {
return w, int(math.abs(int(bmp.tf.y_max - bmp.tf.y_min)) * bmp.scale)
}
// draw_glyph plots the pixels of the glyph at `index` to the internal buffer and
// returns the `x_max` and `x_min` values.
pub fn (mut bmp BitMap) draw_glyph(index u16) (int, int) {
glyph := bmp.tf.read_glyph(index)

11
vlib/x/ttf/render_sokol_cpu.v
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@ -17,6 +17,8 @@ import gg
import sokol.sgl
import sokol.gfx
// TTF_render_Sokol is a structure containing data for rendering a TTF font
// as a sokol texture
pub struct TTF_render_Sokol {
pub mut:
bmp &BitMap = unsafe { nil } // Base bitmap render
@ -32,10 +34,12 @@ pub mut:
* Render functions
*
******************************************************************************/
// format_texture formats the BMP (bitmap).
pub fn (mut tf_skl TTF_render_Sokol) format_texture() {
tf_skl.bmp.format_texture()
}
// create_text prepares the text `in_txt` in size `in_font_size` as a sokol texture.
pub fn (mut tf_skl TTF_render_Sokol) create_text(in_txt string, in_font_size f32) {
scale_reduct := tf_skl.scale_reduct
device_dpi := tf_skl.device_dpi
@ -72,6 +76,7 @@ pub fn (mut tf_skl TTF_render_Sokol) create_text(in_txt string, in_font_size f32
tf_skl.format_texture()
}
// create_text_block prepares a block of text as a sokol texture.
pub fn (mut tf_skl TTF_render_Sokol) create_text_block(in_txt string, in_w int, in_h int, in_font_size f32) {
scale_reduct := tf_skl.scale_reduct
device_dpi := tf_skl.device_dpi
@ -116,6 +121,7 @@ pub fn (mut tf_skl TTF_render_Sokol) create_text_block(in_txt string, in_w int,
* Sokol Render functions
*
******************************************************************************/
// create_texture creates the sokol texture from the internal buffer state.
pub fn (mut tf_skl TTF_render_Sokol) create_texture() {
w := tf_skl.bmp.width
h := tf_skl.bmp.height
@ -150,12 +156,14 @@ pub fn (mut tf_skl TTF_render_Sokol) create_texture() {
tf_skl.sg_smp = ssmp
}
// destroy_texture detroys the internal sokol texture.
pub fn (tf_skl TTF_render_Sokol) destroy_texture() {
gfx.destroy_image(tf_skl.sg_img)
gfx.destroy_sampler(tf_skl.sg_smp)
}
// Use only if usage: .dynamic
// update_text_texture updates the sokol texture with current internal state.
// NOTE: Only use if `.dynamic` is set.
pub fn (mut tf_skl TTF_render_Sokol) update_text_texture() {
sz := tf_skl.bmp.width * tf_skl.bmp.height * tf_skl.bmp.bp
mut tmp_sbc := gfx.ImageData{}
@ -166,6 +174,7 @@ pub fn (mut tf_skl TTF_render_Sokol) update_text_texture() {
gfx.update_image(tf_skl.sg_img, &tmp_sbc)
}
// draw_text_bmp renders the internal state to the current sokol pipeline.
pub fn (tf_skl TTF_render_Sokol) draw_text_bmp(ctx &gg.Context, x f32, y f32) {
// width := tf_skl.bmp.width >> 1
// height := tf_skl.bmp.height >> 1

4
vlib/x/ttf/text_block.v
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@ -12,6 +12,7 @@ module ttf
*
* TODO:
**********************************************************************/
// Text_block represents a visual block of TTF text.
pub struct Text_block {
x int // x position of the left high corner
y int // y position of the left high corner
@ -20,6 +21,7 @@ pub struct Text_block {
cut_lines bool = true // force to cut the line if the length is over the text block width
}
// get_justify_space_cw returns the space needed to justify `txt`.
pub fn (mut dev BitMap) get_justify_space_cw(txt string, w int, block_w int, space_cw int) f32 {
num_spaces := txt.count(' ')
if num_spaces < 1 {
@ -33,7 +35,7 @@ pub fn (mut dev BitMap) get_justify_space_cw(txt string, w int, block_w int, spa
return res
}
// write out a text
// draw_text_block renders out `text` in the `Text_block` `block`.
pub fn (mut bmp BitMap) draw_text_block(text string, block Text_block) {
mut x := block.x
mut y := block.y

19
vlib/x/ttf/ttf.v
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@ -43,6 +43,11 @@ mut:
* TTF_File structs
*
******************************************************************************/
// TTF_File represents the data contents of a complete `*.ttf` file.
// The struct is usually initialized by reading raw TTF data into the `buf` member field
// for example by doing: `ttf_font.buf = os.read_bytes("arial.ttf") or { panic(err) }`,
// and then run the `init/0` method, for example: `ttf_font.init()`
pub struct TTF_File {
pub mut:
buf []u8
@ -96,6 +101,7 @@ pub mut:
width_scale f32 = 1.0
}
// init initializes essential `TTF_File` fields from the contents of `buf`.
pub fn (mut tf TTF_File) init() {
tf.read_offset_tables()
tf.read_head_table()
@ -117,6 +123,7 @@ pub fn (mut tf TTF_File) init() {
* TTF_File Glyph Structs
*
******************************************************************************/
// Point represents a 2D point
pub struct Point {
pub mut:
x int
@ -134,6 +141,7 @@ const g_type_simple = u16(1) // simple type
const g_type_complex = u16(2)
// Glyph represents a single renderable unit ("a character") of the TTF.
pub struct Glyph {
pub mut:
g_type u16 = g_type_simple
@ -153,6 +161,8 @@ pub mut:
* TTF_File metrics and glyph
*
******************************************************************************/
// get_horizontal_metrics returns the horizontal metrics `advance_width` and `left_side_bearing`
// for the glyph at index `glyph_index`.
pub fn (mut tf TTF_File) get_horizontal_metrics(glyph_index u16) (int, int) {
assert 'hmtx' in tf.tables
old_pos := tf.pos
@ -206,6 +216,7 @@ fn (mut tf TTF_File) get_glyph_offset(index u32) u32 {
return offset + tf.tables['glyf'].offset
}
// glyph_count returns the number of glyphs available in the TTF.
pub fn (mut tf TTF_File) glyph_count() u16 {
assert 'maxp' in tf.tables
old_pos := tf.pos
@ -215,6 +226,7 @@ pub fn (mut tf TTF_File) glyph_count() u16 {
return count
}
// read_glyph_dim returns glyph dimension data in the form `x_min`, `x_max`, `y_min` and `y_max`.
pub fn (mut tf TTF_File) read_glyph_dim(index u16) (int, int, int, int) {
offset := tf.get_glyph_offset(index)
// dprintln("offset: $offset")
@ -239,6 +251,7 @@ pub fn (mut tf TTF_File) read_glyph_dim(index u16) (int, int, int, int) {
return x_min, x_max, y_min, y_max
}
// get_ttf_widths returns all possible widths of the TTF.
pub fn (mut tf TTF_File) get_ttf_widths() ([]int, int, int) {
mut space_cw, _ := tf.get_horizontal_metrics(u16(` `))
// div_space_cw := int((f32(space_cw) * 0.3))
@ -291,6 +304,7 @@ pub fn (mut tf TTF_File) get_ttf_widths() ([]int, int, int) {
return widths, min_code, max_code
}
// read_glyph returns `Glyph` data for the glyph at `index`.
pub fn (mut tf TTF_File) read_glyph(index u16) Glyph {
index_int := int(index) // index.str()
if index_int in tf.glyph_cache {
@ -834,6 +848,8 @@ fn (mut tf TTF_File) read_cmap(offset u32) {
* CMAPS 0/4
*
******************************************************************************/
// map_code returns the glyph index for the `char_code` character code.
// map_code returns `0` if the character code could not be found.
pub fn (mut tf TTF_File) map_code(char_code int) u16 {
mut index := 0
for i in 0 .. tf.cmaps.len {
@ -1069,12 +1085,14 @@ fn (mut tf TTF_File) read_kern_table() {
}
}
// reset_kern resets the internal kerning table data.
pub fn (mut tf TTF_File) reset_kern() {
for i in 0 .. tf.kern.len {
tf.kern[i].reset()
}
}
// next_kern returns the next `x`, `y` kerning for the glyph at index `glyph_index`.
pub fn (mut tf TTF_File) next_kern(glyph_index int) (int, int) {
mut x := 0
mut y := 0
@ -1128,6 +1146,7 @@ fn (mut tf TTF_File) read_panose_table() {
* TTF_File Utility
*
******************************************************************************/
// get_info_string returns a string with various information about the TTF.
pub fn (tf TTF_File) get_info_string() string {
txt := '----- Font Info -----
font_family : ${tf.font_family}