forked from Lephenixnoir/gint
127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
#define GINT_NEED_VRAM
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#include <gint/defs/types.h>
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#include <gint/defs/attributes.h>
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#include <gint/display.h>
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#include <gint/std/string.h>
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#include <display/common.h>
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#include "topti-asm.h"
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/* Default font */
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extern font_t gint_font8x9;
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font_t const * gint_default_font = &gint_font8x9;
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font_t const * topti_font = &gint_font8x9;
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/* topti_glyph(): Render a glyph on the VRAM
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Prints a glyph naively using word accesses, because for most fonts with a
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small size (including gint's 8x9 font) this will be more efficient than the
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complex logic for longword accesses.
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This function assumes that at least one of [fg] and [bg] is not transparent.
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@vram Target position on VRAM, adjusted to [top], not adjusted to [left]
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@data Glyph data
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@left Left-position of subglyph
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@top Top-Position of subglyph
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@width Subglyph width
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@height Subglyph height
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@dataw Glyph width
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@fg @bg Foreground and background colors */
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GSECTION(".pretext")
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static void topti_glyph(uint16_t *vram, uint32_t const * data, int left,
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int top, int width, int height, int dataw, int fg, int bg)
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{
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int index = top * dataw + left;
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/* Most common situation: opaque text on transparent background */
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if(bg < 0) topti_glyph_fg(vram + left, data, fg, height, width,
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dataw - width, index);
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/* Full text on opaque background */
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else if(fg >= 0) topti_glyph_fg_bg(vram + left, data, (fg << 16) | bg,
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height, width, dataw - width, index);
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/* Draw background but not text */
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else topti_glyph_bg(vram + left, data, bg, height, width,
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dataw - width, index);
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}
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GSECTION(".pretext")
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void topti_render(int x, int y, char const *str, size_t size, font_t const *f,
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int fg, int bg)
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{
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/* Raw glyph data */
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uint32_t const * data;
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if(!f->prop) data = f->data;
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else
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{
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int cs = charset_size(f->charset);
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/* 4-align the result */
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cs += (4 - cs) & 3;
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data = (void *)(f->sized_data + cs);
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}
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/* Storage height, top position within glyph */
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int height = f->data_height, top = 0;
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/* Vertical clipping */
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if(x > 395 || y > 223 || y + height <= 0) return;
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if(y + height > 224) height = 224 - y;
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if(y < 0) top = -y, height += y, y = 0;
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/* Move to top row */
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uint16_t *target = vram + 396 * y;
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/* Character spacing and space waiting to be drawn */
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int space = 1;
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int active_space = 0;
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/* Read each character from the input string */
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while(size--)
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{
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int c = *str++;
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int glyph = charset_decode(f->charset, c);
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if(glyph < 0) continue;
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/* Draw the space if background is opaque */
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int prop_space = (c == ' ' && f->prop) ? 5 : 0;
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if((active_space && bg >= 0) || prop_space)
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{
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active_space += prop_space;
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drect(x, y, x + active_space - 1, y + height - 1, bg);
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}
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x += active_space;
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if(prop_space) { active_space = space; continue; }
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if(x >= 396) break;
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int index = topti_offset(f, glyph);
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/* Compute horizontal intersection between glyph and screen */
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int dataw = f->prop ? f->sized_data[glyph] : f->width;
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int width = dataw, left = 0;
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if(x + dataw <= 0)
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{
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x += dataw;
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active_space = space;
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continue;
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}
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if(x < 0) left = -x, width += x;
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if(x + width > 396) width = 396 - x;
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/* Render glyph */
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topti_glyph(target + x, data + index, left, top, width, height,
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dataw, fg, bg);
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x += dataw;
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active_space = space;
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}
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}
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/* dtext() - display a string of text */
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GSECTION(".pretext")
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void dtext(int x, int y, char const *str, int fg, int bg)
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{
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topti_render(x, y, str, strlen(str), topti_font, fg, bg);
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}
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