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// MIT License, Copyright (c) 2020 Marvin Borner
// Some GFX functions
// TODO: Better support for bpp < 32
#include <assert.h>
#include <bmp.h>
#include <gfx.h>
#include <mem.h>
#include <psf.h>
#include <str.h>
#include <sys.h>
#include <vesa.h>
struct font *font;
static void write_char(struct context *ctx, int x, int y, u32 c, char ch)
{
int bypp = ctx->bpp >> 3;
int pos = x * bypp + y * ctx->pitch;
char *draw = (char *)&ctx->fb[pos];
u32 stride = font->char_size / font->height;
for (int cy = 0; cy < font->height; cy++) {
for (int cx = 0; cx < font->width; cx++) {
u8 bits = font->chars[ch * font->char_size + cy * stride + cx / 8];
u8 bit = bits >> (7 - cx % 8) & 1;
if (bit) {
draw[bypp * cx] = GET_BLUE(c);
draw[bypp * cx + 1] = GET_GREEN(c);
draw[bypp * cx + 2] = GET_RED(c);
draw[bypp * cx + 3] = GET_ALPHA(c);
}
}
draw += ctx->pitch;
}
}
static void draw_rectangle(struct context *ctx, int x1, int y1, int x2, int y2, u32 c)
{
int bypp = ctx->bpp >> 3;
u8 *draw = &ctx->fb[x1 * bypp + y1 * ctx->pitch];
for (int i = 0; i < y2 - y1; i++) {
for (int j = 0; j < x2 - x1; j++) {
draw[bypp * j] = GET_BLUE(c);
draw[bypp * j + 1] = GET_GREEN(c);
draw[bypp * j + 2] = GET_RED(c);
draw[bypp * j + 3] = GET_ALPHA(c);
}
draw += ctx->pitch;
}
}
void gfx_write_char(struct context *ctx, int x, int y, u32 c, char ch)
{
write_char(ctx, x, y, c, ch);
gfx_redraw();
}
void gfx_write(struct context *ctx, int x, int y, u32 c, char *text)
{
for (u32 i = 0; i < strlen(text); i++) {
write_char(ctx, x + i * font->width, y, c, text[i]);
}
gfx_redraw();
}
void gfx_load_image(struct context *ctx, char *path, int x, int y)
{
// TODO: Support x, y
struct bmp *bmp = bmp_load(path);
assert(bmp && bmp->width + x <= ctx->width);
assert(bmp && bmp->height + y <= ctx->height);
// TODO: Support padding with odd widths
int bypp = bmp->bpp >> 3;
u8 *srcfb = &bmp->data[bypp + (bmp->height - 1) * bmp->pitch];
u8 *destfb = &ctx->fb[bypp];
for (u32 cy = 0; cy < bmp->height; cy++) {
memcpy(destfb, srcfb, bmp->pitch);
srcfb -= bmp->pitch;
destfb += ctx->pitch;
}
gfx_redraw();
}
void gfx_load_wallpaper(struct context *ctx, char *path)
{
gfx_load_image(ctx, path, 0, 0);
}
void gfx_copy(struct context *dest, struct context *src, int x, int y, u32 width, u32 height)
{
int bypp = dest->bpp >> 3;
u8 *srcfb = &src->fb[x * bypp + y * src->pitch];
u8 *destfb = &dest->fb[x * bypp + y * dest->pitch];
for (u32 cy = 0; cy < height; cy++) {
memcpy(destfb, srcfb, width * (dest->bpp >> 3));
srcfb += src->pitch;
destfb += dest->pitch;
}
}
// TODO: Support alpha values other than 0x0 and 0xff (blending)
// TODO: Optimize!
void gfx_ctx_on_ctx(struct context *dest, struct context *src, int x, int y)
{
if (src->width == dest->width && src->height == dest->height && src->x == 0 &&
dest->y == 0) {
memcpy(dest->fb, src->fb, dest->pitch * dest->height);
return;
}
if (src->width > dest->width || src->height > dest->height)
return;
// TODO: Negative x and y
int bypp = dest->bpp >> 3;
u8 *srcfb = src->fb;
u8 *destfb = &dest->fb[x * bypp + y * dest->pitch];
for (u32 cy = 0; cy < src->height && cy + y < dest->height; cy++) {
for (u32 cx = 0; cx < src->width && cx + x < dest->width; cx++) {
if (srcfb[bypp * cx + 3]) {
destfb[bypp * cx + 0] = srcfb[bypp * cx + 0];
destfb[bypp * cx + 1] = srcfb[bypp * cx + 1];
destfb[bypp * cx + 2] = srcfb[bypp * cx + 2];
destfb[bypp * cx + 3] = srcfb[bypp * cx + 3];
}
}
srcfb += src->pitch;
destfb += dest->pitch;
}
}
void gfx_draw_rectangle(struct context *ctx, int x1, int y1, int x2, int y2, u32 c)
{
draw_rectangle(ctx, x1, y1, x2, y2, c);
gfx_redraw();
}
void gfx_fill(struct context *ctx, u32 c)
{
draw_rectangle(ctx, 0, 0, ctx->width, ctx->height, c);
gfx_redraw();
}
void gfx_border(struct context *ctx, u32 c, u32 width)
{
if (width <= 0)
return;
int bypp = ctx->bpp >> 3;
u8 *draw = ctx->fb;
for (u32 i = 0; i < ctx->height; i++) {
for (u32 j = 0; j < ctx->width; j++) {
if (j <= width - 1 || i <= width - 1 ||
j - ctx->width + width + 1 <= width ||
i - ctx->height + width <= width) {
draw[bypp * j + 0] = GET_BLUE(c);
draw[bypp * j + 1] = GET_GREEN(c);
draw[bypp * j + 2] = GET_RED(c);
draw[bypp * j + 3] = GET_ALPHA(c);
}
}
draw += ctx->pitch;
}
gfx_redraw();
}
int gfx_font_height()
{
return font->height;
}
int gfx_font_width()
{
return font->width;
}
void gfx_init(char *font_path)
{
font = psf_parse(read(font_path));
assert(font);
}
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