gg: some stuff required to have svg and png screenshots working on v ui (#14180)

vlib/gg/gg_ui.c.v

@@ -0,0 +1,24 @@
+module gg
+
+import gx
+import sokol.sgl
+
+// Stuff for ui from now for screenshot (that would be interesting for gg if screenshot is implemented also for gg)
+
+// required for ui.DrawDevice interface (with &gg.Context as an instance)
+pub fn (ctx &Context) scissor_rect(x int, y int, w int, h int) {
+	sgl.scissor_rect(int(dpi_scale() * x), int(dpi_scale() * y), int(dpi_scale() * w),
+		int(dpi_scale() * h), true)
+}
+
+pub fn (ctx &Context) has_text_style() bool {
+	return false
+}
+
+pub fn (ctx &Context) set_text_style(font_name string, font_path string, size int, color gx.Color, align int, vertical_align int) {}
+
+// default draw_text (draw_text_def but without set_cfg)
+pub fn (ctx &Context) draw_text_default(x int, y int, text string) {
+	scale := if ctx.ft.scale == 0 { f32(1) } else { ctx.ft.scale }
+	ctx.ft.fons.draw_text(x * scale, y * scale, text) // TODO: check offsets/alignment
+}

vlib/x/ttf/render_bmp.v

@@ -59,13 +59,13 @@ pub fn (mut bmp BitMap) clear() {
 }
 
 // transform matrix applied to the text
-fn (bmp &BitMap) trf_txt(p &Point) (int, int) {
+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
-fn (bmp &BitMap) trf_ch(p &Point) (int, int) {
+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])
 }

vlib/x/ttf/text_block.v

@@ -20,7 +20,7 @@ pub struct Text_block {
 	cut_lines bool = true // force to cut the line if the length is over the text block width
 }
 
-fn (mut dev BitMap) get_justify_space_cw(txt string, w int, block_w int, space_cw int) f32 {
+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 {
 		return 0

vlib/x/ttf/ttf.v

@@ -771,7 +771,7 @@ fn (mut tf TTF_File) read_cmap(offset u32) {
 * CMAPS 0/4
 *
 ******************************************************************************/
-fn (mut tf TTF_File) map_code(char_code int) u16 {
+pub fn (mut tf TTF_File) map_code(char_code int) u16 {
 	mut index := 0
 	for i in 0 .. tf.cmaps.len {
 		mut cmap := tf.cmaps[i]
@@ -1006,13 +1006,13 @@ fn (mut tf TTF_File) read_kern_table() {
 	}
 }
 
-fn (mut tf TTF_File) reset_kern() {
+pub fn (mut tf TTF_File) reset_kern() {
 	for i in 0 .. tf.kern.len {
 		tf.kern[i].reset()
 	}
 }
 
-fn (mut tf TTF_File) next_kern(glyph_index int) (int, int) {
+pub fn (mut tf TTF_File) next_kern(glyph_index int) (int, int) {
 	mut x := 0
 	mut y := 0
 	for i in 0 .. tf.kern.len {