From 8e25f05bad59323d55dd80ce9c753322d2ac73e5 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Fri, 31 Aug 2018 14:19:11 +0200
Subject: gl: Allow varying font sizes in text rendering.

---
 platform/gl/gl-app.h  |  2 +-
 platform/gl/gl-font.c | 20 ++++++++++----------
 platform/gl/gl-ui.c   |  2 +-
 3 files changed, 12 insertions(+), 12 deletions(-)

(limited to 'platform')

diff --git a/platform/gl/gl-app.h b/platform/gl/gl-app.h
index 8b4cbe74..0faa35b0 100644
--- a/platform/gl/gl-app.h
+++ b/platform/gl/gl-app.h
@@ -109,7 +109,7 @@ void ui_finish(void);
 void ui_set_clipboard(const char *buf);
 const char *ui_get_clipboard(void);
 
-void ui_init_fonts(float pixelsize);
+void ui_init_fonts(void);
 void ui_finish_fonts(void);
 float ui_measure_character(int ucs);
 void ui_begin_text(void);
diff --git a/platform/gl/gl-font.c b/platform/gl/gl-font.c
index 3b7c3e77..b286d8a6 100644
--- a/platform/gl/gl-font.c
+++ b/platform/gl/gl-font.c
@@ -29,6 +29,7 @@
 struct key
 {
 	fz_font *font;
+	float size;
 	short gid;
 	unsigned char subx;
 	unsigned char suby;
@@ -56,7 +57,6 @@ static int g_cache_row_x = 0;
 static int g_cache_row_h = 0;
 
 static fz_font *g_font = NULL;
-static float g_font_size = 16;
 
 static void clear_font_cache(void)
 {
@@ -76,7 +76,7 @@ static void clear_font_cache(void)
 	g_cache_row_h = 0;
 }
 
-void ui_init_fonts(float pixelsize)
+void ui_init_fonts(void)
 {
 	const unsigned char *data;
 	int size;
@@ -95,7 +95,6 @@ void ui_init_fonts(float pixelsize)
 	if (!data)
 		data = fz_lookup_builtin_font(ctx, "Times", 0, 0, &size);
 	g_font = fz_new_font_from_memory(ctx, NULL, data, size, 0, 0);
-	g_font_size = pixelsize;
 }
 
 void ui_finish_fonts(void)
@@ -127,7 +126,7 @@ static unsigned int lookup_table(struct key *key)
 	}
 }
 
-static struct glyph *lookup_glyph(fz_font *font, int gid, float *xp, float *yp)
+static struct glyph *lookup_glyph(fz_font *font, float size, int gid, float *xp, float *yp)
 {
 	fz_matrix trm, subpix_trm;
 	unsigned char subx, suby;
@@ -137,7 +136,7 @@ static struct glyph *lookup_glyph(fz_font *font, int gid, float *xp, float *yp)
 	int w, h;
 
 	/* match fitz's glyph cache quantization */
-	trm = fz_scale(g_font_size, -g_font_size);
+	trm = fz_scale(size, -size);
 	trm.e = *xp;
 	trm.f = *yp;
 	fz_subpixel_adjust(ctx, &trm, &subpix_trm, &subx, &suby);
@@ -150,6 +149,7 @@ static struct glyph *lookup_glyph(fz_font *font, int gid, float *xp, float *yp)
 
 	memset(&key, 0, sizeof key);
 	key.font = font;
+	key.size = size;
 	key.gid = gid;
 	key.subx = subx;
 	key.suby = suby;
@@ -225,12 +225,12 @@ static struct glyph *lookup_glyph(fz_font *font, int gid, float *xp, float *yp)
 	return &g_table[pos].glyph;
 }
 
-static float ui_draw_glyph(fz_font *font, int gid, float x, float y)
+static float ui_draw_glyph(fz_font *font, float size, int gid, float x, float y)
 {
 	struct glyph *glyph;
 	float s0, t0, s1, t1, xc, yc;
 
-	glyph = lookup_glyph(font, gid, &x, &y);
+	glyph = lookup_glyph(font, size, gid, &x, &y);
 	if (!glyph)
 		return 0;
 
@@ -246,21 +246,21 @@ static float ui_draw_glyph(fz_font *font, int gid, float x, float y)
 	glTexCoord2f(s1, t1); glVertex2f(xc + glyph->w, yc);
 	glTexCoord2f(s0, t1); glVertex2f(xc, yc);
 
-	return fz_advance_glyph(ctx, font, gid, 0) * g_font_size;
+	return fz_advance_glyph(ctx, font, gid, 0) * size;
 }
 
 float ui_measure_character(int ucs)
 {
 	fz_font *font;
 	int gid = fz_encode_character_with_fallback(ctx, g_font, ucs, 0, 0, &font);
-	return fz_advance_glyph(ctx, font, gid, 0) * g_font_size;
+	return fz_advance_glyph(ctx, font, gid, 0) * ui.fontsize;
 }
 
 float ui_draw_character(int ucs, float x, float y)
 {
 	fz_font *font;
 	int gid = fz_encode_character_with_fallback(ctx, g_font, ucs, 0, 0, &font);
-	return ui_draw_glyph(font, gid, x, y);
+	return ui_draw_glyph(font, ui.fontsize, gid, x, y);
 }
 
 void ui_begin_text(void)
diff --git a/platform/gl/gl-ui.c b/platform/gl/gl-ui.c
index 7ce94500..4e8a4325 100644
--- a/platform/gl/gl-ui.c
+++ b/platform/gl/gl-ui.c
@@ -422,7 +422,7 @@ void ui_init(int w, int h, const char *title)
 	ui.lineheight = DEFAULT_UI_LINEHEIGHT * ui_scale;
 	ui.gridsize = DEFAULT_UI_GRIDSIZE * ui_scale;
 
-	ui_init_fonts(ui.fontsize);
+	ui_init_fonts();
 
 	ui.overlay_list = glGenLists(1);
 }
-- 
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