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#include "paging.h"
#include "window.h"
#include "drive.h"
#include "task.h"
#include "util.h"
#include "pmap.h"
#include "log.h"
#define MAX_WINDOWS 64
#define ACTION_BUFFER_PAGES 1
#define AB_END(buf) (buf + (ACTION_BUFFER_PAGES * 4096) / sizeof(struct window_action))
#define BACKGROUND(x, y) ((x / 16 + y / 16) % 2 ? 0x14 : 0x07)
static struct window {
const volatile void *pixel_buffer_pma;
uint16_t width;
uint16_t height;
uint16_t xpos;
uint16_t ypos;
struct window_action *action_buffer;
struct window_action *next_action_read;
struct window_action *next_action_write;
struct window *above;
struct window *below;
struct task_state *from_task;
} windows[MAX_WINDOWS];
static struct window *bottom_window = 0;
static struct window *top_window = 0;
static inline void set_pix(uint16_t x, uint16_t y, uint8_t value) {
if ((x < 320) && (y < 200))
*(uint8_t *)(0xa0000 + y * 320 + x) = value;
}
static void paint_and_above(const struct window *w) {
switch_to_kernel_cr3();
for (const struct window *i = w; i; i = i->above)
for (uint16_t y = 0; y < i->height; ++y)
for (uint16_t x = 0; x < i->width; ++x) {
const uint8_t pixel = ((uint8_t *)i->pixel_buffer_pma)[y * i->width + x];
if (pixel)
set_pix(x + i->xpos, y + i->ypos, pixel);
}
switch_to_task_cr3();
}
void paint_bg() {
for (uint16_t y = 0; y < 200; ++y)
for (uint16_t x = 0; x < 320; ++x)
set_pix(x, y, BACKGROUND(x, y));
}
static void paint_all() {
paint_bg();
paint_and_above(bottom_window);
}
struct window *new_window(uint16_t width, uint16_t height, const void *pixel_buffer) {
if (!pixel_buffer) {
logf(LOG_WARN, "Refusing to create window with null pixel buffer for task %s.", active_task->name);
return 0;
}
struct window *w;
for (uint8_t i = 0; i < MAX_WINDOWS; ++i)
if (!windows[i].pixel_buffer_pma) {
w = &windows[i];
goto got_window;
}
return 0;
got_window:
w->pixel_buffer_pma = vma_to_pma(active_task->page_directory, pixel_buffer);
w->width = width;
w->height = height;
struct window_action *const ab = allocate_kernel_pages(ACTION_BUFFER_PAGES);
w->action_buffer = ab;
w->next_action_read = ab;
w->next_action_write = ab;
if (top_window)
top_window->above = w;
else
bottom_window = w;
w->above = 0;
w->below = top_window;
top_window = w;
w->from_task = active_task;
paint_and_above(w);
return w;
}
void del_window(struct window *w) {
if (w == top_window)
top_window = w->below;
if (w == bottom_window)
bottom_window = w->above;
if (w->below)
w->below->above = w->above;
if (w->above)
w->above->below = w->below;
free_pages(w->action_buffer, ACTION_BUFFER_PAGES);
w->pixel_buffer_pma = 0;
paint_all();
}
void resize_window(struct window *w, uint16_t width, uint16_t height) {
const bool smaller = (width < w->width) || (height < w->height);
w->width = width;
w->height = height;
if (smaller)
paint_all();
else
paint_and_above(w);
}
void reassign_pixel_buffer(struct window *w, const void *pixel_buffer) {
w->pixel_buffer_pma = vma_to_pma(active_task->page_directory, pixel_buffer);
}
void push_window_paint(const struct window *w) {
paint_and_above(w);
}
struct window_action next_window_action(struct window *w) {
if (w->next_action_write == w->next_action_read)
return (struct window_action){.action_type = NONE};
const struct window_action *const action = w->next_action_read;
if (++(w->next_action_read) >= AB_END(w->action_buffer))
w->next_action_read = w->action_buffer;
return *action;
}
static void send_action(struct window *w, struct window_action packet) {
struct window_action *next_next = w->next_action_write + 1;
if (next_next >= AB_END(w->action_buffer))
next_next = w->action_buffer;
if (next_next != w->next_action_read) {
*(w->next_action_write) = packet;
w->next_action_write = next_next;
unwait(w->from_task, (struct wait){.mode = WINDOW_ACTION});
}
}
enum wm_action {
WM_SHUFFLE_UP,
WM_SHUFFLE_DOWN,
WM_MOVE_LEFT,
WM_MOVE_RIGHT,
WM_MOVE_UP,
WM_MOVE_DOWN,
N_WM_ACTIONS
};
static struct key_packet keybinds[] = {
{.key_id = KEY_PAGE_DOWN, .modifiers = WINS},
{.key_id = KEY_PAGE_UP, .modifiers = WINS},
{.key_id = KEY_LEFT_ARROW, .modifiers = WINS},
{.key_id = KEY_RIGHT_ARROW, .modifiers = WINS},
{.key_id = KEY_UP_ARROW, .modifiers = WINS},
{.key_id = KEY_DOWN_ARROW, .modifiers = WINS}
};
static inline bool fuzzy_key_match(struct key_packet t, struct key_packet a) {
if (t.key_id != a.key_id)
return false;
if (((t.modifiers & SHIFTS) == SHIFTS) && (a.modifiers & SHIFTS))
a.modifiers |= SHIFTS;
if (((t.modifiers & CTRLS) == CTRLS) && (a.modifiers & CTRLS))
a.modifiers |= CTRLS;
if (((t.modifiers & ALTS) == ALTS) && (a.modifiers & ALTS))
a.modifiers |= ALTS;
if (((t.modifiers & WINS) == WINS) && (a.modifiers & WINS))
a.modifiers |= WINS;
return a.modifiers == t.modifiers;
}
#include "log.h"
void on_action(struct window_action packet) {
//logf(LOG_INFO, "Window action, top window = 0x%d from %s.", top_window, top_window->from_task->name);
if (packet.action_type == NOT_READY)
return;
if (top_window) {
if (packet.action_type == KEY_DOWN)
for (uint8_t i = 0; i < N_WM_ACTIONS; ++i)
if (fuzzy_key_match(keybinds[i], packet.as_key)) {
switch_to_kernel_cr3();
struct window *old_top, *old_bottom;
switch (i) {
case WM_SHUFFLE_UP:
old_top = top_window;
old_bottom = bottom_window;
top_window = old_top->below;
top_window->above = 0;
old_top->below = 0;
old_top->above = old_bottom;
old_bottom->below = old_top;
bottom_window = old_top;
paint_and_above(bottom_window->above);
break;
case WM_SHUFFLE_DOWN:
old_top = top_window;
old_bottom = bottom_window;
bottom_window = old_bottom->above;
bottom_window->below = 0;
old_bottom->above = 0;
old_bottom->below = old_top;
old_top->above = old_bottom;
top_window = old_bottom;
paint_and_above(top_window);
break;
case WM_MOVE_LEFT:
--top_window->xpos;
paint_all();
break;
case WM_MOVE_RIGHT:
++top_window->xpos;
paint_all();
break;
case WM_MOVE_UP:
--top_window->ypos;
paint_all();
break;
case WM_MOVE_DOWN:
++top_window->ypos;
paint_all();
}
switch_to_task_cr3();
return;
}
send_action(top_window, packet);
}
}
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