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#include "window.h"
#include <SDL2/SDL.h>
#include "buffer.h"
#include "editor.h"
#include "error.h"
#include "font.h"
#include "input.h"
#include "syntax.h"
static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
static SDL_Texture *font_texture = NULL;
static int window_width;
static int window_height;
static PSFFont font;
void window_init(const char *title, int rows, int cols)
{
if (SDL_Init(SDL_INIT_VIDEO) != 0)
fatal_error("Failed to init SDL: %s\n", SDL_GetError());
font = font_load("terminus/ter-u24n.psf");
window_width = cols * font.width;
window_height = rows * font.height;
window = SDL_CreateWindow(title, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, window_width, window_height, SDL_WINDOW_RESIZABLE);
if (window == NULL)
fatal_error("Failed to create window: %s\n", SDL_GetError());
renderer = SDL_CreateRenderer(window, -1, 0);
if (renderer == NULL)
fatal_error("Failed to create renderer: %s\n", SDL_GetError());
font_texture = font_create_texture(renderer, &font);
SDL_ShowWindow(window);
}
int window_handle_event(struct editor_state *editor)
{
static SDL_Event e;
SDL_WaitEvent(&e);
switch (e.type) {
case SDL_QUIT:
return 0;
case SDL_KEYDOWN:
editor_process_keypress(editor, &e.key.keysym);
break;
case SDL_TEXTINPUT:
if (editor->mode == EDITOR_MODE_NORMAL)
break;
/*
* Ignore the first letter after entering insert mode, because it
* usually is just 'i'.
*/
if (editor->pressed_insert_key) {
editor->pressed_insert_key = 0;
break;
}
editor_insert_char(editor, *e.text.text);
break;
case SDL_WINDOWEVENT:
if (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
SDL_GetWindowSize(window, &window_width, &window_height);
editor_update_screen_size(editor);
}
break;
}
return 1;
}
static void draw_string(const char *str, const uint8_t *highlight, size_t len, int x, int y)
{
SDL_Rect dstrect = { x, y, font.width, font.height };
SDL_Rect srcrect = { 0, 0, font.width, font.height };
int current_colour = 0xffffff;
for (int i = 0; i < len; i++) {
const char letter = str[i];
if (letter == '\n') {
dstrect.x = x;
dstrect.y += font.height;
continue;
}
if (isspace(letter)) {
dstrect.x += font.width;
continue;
}
if (letter == '\0')
break;
int glyph_index = letter;
if (font.unicode_desc != NULL)
glyph_index = font.unicode_desc[glyph_index];
srcrect.x = glyph_index * font.width;
int colour = current_colour;
if (highlight != NULL)
colour = editor_syntax_to_colour(highlight[i]);
if (colour != current_colour) {
current_colour = colour;
unsigned char r = (colour >> 16) & 0xff;
unsigned char g = (colour >> 8) & 0xff;
unsigned char b = colour & 0xff;
SDL_SetTextureColorMod(font_texture, r, g, b);
}
SDL_RenderCopy(renderer, font_texture, &srcrect, &dstrect);
dstrect.x += font.width;
}
}
static void draw_editor(struct editor_state *editor)
{
int line_y;
/* Draw each line of text. */
for (int i = 0; i < editor->screen_rows; i++) {
line_y = i * font.height;
if (i + editor->line_offset >= editor->num_lines) {
SDL_SetTextureColorMod(font_texture, 0xcc, 0x00, 0xcc);
draw_string("~", NULL, 1, 0, line_y);
continue;
}
line_t *line = &editor->lines[i + editor->line_offset];
/* Size and length of the text including the scroll offset. */
char *printed_text = &line->render[editor->col_offset];
unsigned char *printed_highlight = &line->highlight[editor->col_offset];
size_t printed_size = line->render_size - editor->col_offset;
if (line->render_size >= printed_size)
draw_string(printed_text, printed_highlight, printed_size, 0, line_y);
}
/* Draw the statusline containing file information */
struct append_buffer statusbuf = ABUF_INIT;
editor_draw_status_bar(editor, &statusbuf);
editor_draw_message_bar(editor, &statusbuf);
line_y = window_height - (font.height * 2);
SDL_SetTextureColorMod(font_texture, 0xff, 0xff, 0xff);
draw_string(statusbuf.buffer, NULL, statusbuf.length, 0, line_y);
ab_free(&statusbuf);
}
void window_redraw(struct editor_state *editor)
{
SDL_RenderClear(renderer);
editor_scroll(editor);
draw_editor(editor);
SDL_Rect cursor_rect;
cursor_rect.x = (editor->cursor_display_x - editor->col_offset) * font.width;
cursor_rect.y = (editor->cursor_y - editor->line_offset) * font.height;
cursor_rect.w = font.width;
cursor_rect.h = font.height;
SDL_SetRenderDrawColor(renderer, 0x7f, 0x7f, 0x7f, 0xff);
SDL_RenderFillRect(renderer, &cursor_rect);
SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xff);
SDL_RenderPresent(renderer);
SDL_UpdateWindowSurface(window);
}
void window_get_size(int *rows, int *cols)
{
*cols = window_width / font.width;
*rows = window_height / font.height;
}
void window_destroy()
{
font_destroy(&font);
SDL_DestroyTexture(font_texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
}
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