daniel/MontaukOS
1
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

feat: revamp image viewer

Browse Source
This commit is contained in:
Daniel Hammer
2026-03-06 17:04:16 +01:00
parent 729c227b35
commit d682a49c77
1 changed files with 419 additions and 161 deletions
Download Patch File Download Diff File Expand all files Collapse all files
programs/src/imageviewer/main.cpp
+419 -161
View File
@@ -1,7 +1,7 @@
/*
* main.cpp
* MontaukOS Image Viewer - standalone Window Server process
* Displays JPEG images with pan via mouse drag, scroll wheel, and arrow keys
* Displays images with zoom, pan, fit-to-window, and 1:1 modes
* Copyright (c) 2026 Daniel Hammer
*/
@@ -14,6 +14,7 @@
extern "C" {
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <gui/stb_image.h>
}
@@ -23,13 +24,32 @@ using namespace gui;
// Constants
// ============================================================================
static constexpr int INIT_W = 800;
static constexpr int INIT_H = 600;
static constexpr int PAN_STEP = 40;
static constexpr int FONT_SIZE = 13;
static constexpr int INIT_W = 800;
static constexpr int INIT_H = 600;
static constexpr int TOOLBAR_H = 36;
static constexpr int STATUS_BAR_H = 24;
static constexpr int PAN_STEP = 40;
static constexpr int TB_BTN_SIZE = 24;
static constexpr int TB_BTN_Y = 6;
static constexpr int TB_BTN_RAD = 3;
static constexpr int HEADER_FONT = 16;
static constexpr Color BG_COLOR = Color::from_rgb(0x30, 0x30, 0x30);
static constexpr Color ERR_COLOR = Color::from_rgb(0xCC, 0x33, 0x33);
static constexpr Color BG_COLOR = Color::from_rgb(0x30, 0x30, 0x30);
static constexpr Color TOOLBAR_BG = Color::from_rgb(0xF5, 0xF5, 0xF5);
static constexpr Color TB_BTN_BG = Color::from_rgb(0xE8, 0xE8, 0xE8);
static constexpr Color TB_BTN_ACTIVE = Color::from_rgb(0xC0, 0xD0, 0xE8);
static constexpr Color TB_SEP_COLOR = Color::from_rgb(0xCC, 0xCC, 0xCC);
static constexpr Color GRID_COLOR = Color::from_rgb(0xD0, 0xD0, 0xD0);
static constexpr Color HEADER_TEXT = Color::from_rgb(0x55, 0x55, 0x55);
static constexpr Color STATUS_BG = Color::from_rgb(0x2B, 0x3E, 0x50);
static constexpr Color STATUS_TEXT = Color::from_rgb(0xFF, 0xFF, 0xFF);
static constexpr Color ERR_COLOR = Color::from_rgb(0xCC, 0x33, 0x33);
static constexpr Color CHECK_LIGHT = Color::from_rgb(0xCC, 0xCC, 0xCC);
static constexpr Color CHECK_DARK = Color::from_rgb(0x99, 0x99, 0x99);
// Zoom levels (percentage values / 100)
static constexpr float ZOOM_MIN = 0.05f;
static constexpr float ZOOM_MAX = 16.0f;
// ============================================================================
// App state
@@ -38,28 +58,38 @@ static constexpr Color ERR_COLOR = Color::from_rgb(0xCC, 0x33, 0x33);
static int g_win_w = INIT_W;
static int g_win_h = INIT_H;
// Image data
static uint32_t* g_image = nullptr; // ARGB pixel buffer
// Image data (original, unscaled)
static uint32_t* g_image = nullptr;
static int g_img_w = 0;
static int g_img_h = 0;
static bool g_has_alpha = false;
// Pan offset (image position relative to viewport)
// Zoom and pan
static float g_zoom = 1.0f;
static int g_pan_x = 0;
static int g_pan_y = 0;
// Mouse drag state
static bool g_dragging = false;
static int g_drag_start_x = 0;
static int g_drag_start_y = 0;
static int g_drag_pan_x = 0;
static int g_drag_pan_y = 0;
static bool g_dragging = false;
static int g_drag_start_x = 0;
static int g_drag_start_y = 0;
static int g_drag_pan_x = 0;
static int g_drag_pan_y = 0;
// File info
static char g_status[256] = {};
static bool g_load_ok = false;
static char g_filepath[512] = {};
static char g_status[256] = {};
static bool g_load_ok = false;
// Font
static TrueTypeFont* g_font = nullptr;
static TrueTypeFont* g_font = nullptr;
// Toolbar button X positions (computed during render)
static int tb_zoom_out_x0, tb_zoom_out_x1;
static int tb_zoom_in_x0, tb_zoom_in_x1;
static int tb_fit_x0, tb_fit_x1;
static int tb_actual_x0, tb_actual_x1;
static int tb_open_x0, tb_open_x1;
// ============================================================================
// Helpers
@@ -76,7 +106,45 @@ static void px_fill(uint32_t* px, int bw, int bh,
px[row * bw + col] = v;
}
// Extract basename from a VFS path (e.g. "0:/photos/cat.jpg" -> "cat.jpg")
static void px_hline(uint32_t* px, int bw, int bh, int x, int y, int w, Color c) {
if (y < 0 || y >= bh) return;
uint32_t v = c.to_pixel();
int x0 = x < 0 ? 0 : x;
int x1 = x + w > bw ? bw : x + w;
for (int col = x0; col < x1; col++)
px[y * bw + col] = v;
}
static void px_vline(uint32_t* px, int bw, int bh, int x, int y, int h, Color c) {
if (x < 0 || x >= bw) return;
uint32_t v = c.to_pixel();
int y0 = y < 0 ? 0 : y;
int y1 = y + h > bh ? bh : y + h;
for (int row = y0; row < y1; row++)
px[row * bw + x] = v;
}
static void px_fill_rounded(uint32_t* px, int bw, int bh,
int x, int y, int w, int h, int r, Color c) {
uint32_t v = c.to_pixel();
for (int row = 0; row < h; row++) {
int dy = y + row;
if (dy < 0 || dy >= bh) continue;
for (int col = 0; col < w; col++) {
int dx = x + col;
if (dx < 0 || dx >= bw) continue;
// Check corners
bool skip = false;
int cx, cy;
if (col < r && row < r) { cx = r - col - 1; cy = r - row - 1; if (cx*cx + cy*cy >= r*r) skip = true; }
else if (col >= w - r && row < r) { cx = col - (w - r); cy = r - row - 1; if (cx*cx + cy*cy >= r*r) skip = true; }
else if (col < r && row >= h - r) { cx = r - col - 1; cy = row - (h - r); if (cx*cx + cy*cy >= r*r) skip = true; }
else if (col >= w - r && row >= h - r) { cx = col - (w - r); cy = row - (h - r); if (cx*cx + cy*cy >= r*r) skip = true; }
if (!skip) px[dy * bw + dx] = v;
}
}
}
static const char* basename(const char* path) {
const char* last = path;
for (const char* p = path; *p; p++) {
@@ -85,38 +153,13 @@ static const char* basename(const char* path) {
return last;
}
// Format an integer into a decimal string
static void int_to_str(char* buf, int val) {
if (val == 0) { buf[0] = '0'; buf[1] = '\0'; return; }
bool neg = val < 0;
if (neg) val = -val;
char tmp[16];
int i = 0;
while (val > 0 && i < 15) {
tmp[i++] = '0' + (val % 10);
val /= 10;
}
int j = 0;
if (neg) buf[j++] = '-';
while (i > 0) buf[j++] = tmp[--i];
buf[j] = '\0';
}
static void str_append(char* dst, const char* src, int maxlen) {
int len = montauk::slen(dst);
int i = 0;
while (src[i] && len + i < maxlen - 1) {
dst[len + i] = src[i];
i++;
}
dst[len + i] = '\0';
}
// ============================================================================
// Image loading
// ============================================================================
static bool load_image(const char* path) {
if (g_image) { montauk::mfree(g_image); g_image = nullptr; }
int fd = montauk::open(path);
if (fd < 0) {
montauk::strcpy(g_status, "Error: could not open file");
@@ -124,7 +167,7 @@ static bool load_image(const char* path) {
}
uint64_t size = montauk::getsize(fd);
if (size == 0 || size > 16 * 1024 * 1024) {
if (size == 0 || size > 32 * 1024 * 1024) {
montauk::close(fd);
montauk::strcpy(g_status, "Error: file too large or empty");
return false;
@@ -147,92 +190,307 @@ static bool load_image(const char* path) {
}
int w, h, channels;
unsigned char* rgb = stbi_load_from_memory(filedata, bytes_read, &w, &h, &channels, 3);
unsigned char* rgba = stbi_load_from_memory(filedata, bytes_read, &w, &h, &channels, 4);
montauk::mfree(filedata);
if (!rgb) {
montauk::strcpy(g_status, "Error: ");
const char* reason = stbi_failure_reason();
if (reason) str_append(g_status, reason, 256);
else str_append(g_status, "unknown decode error", 256);
if (!rgba) {
snprintf(g_status, 256, "Error: %s", stbi_failure_reason() ? stbi_failure_reason() : "decode failed");
return false;
}
// Convert RGB to ARGB
g_has_alpha = (channels == 4 || channels == 2);
// Convert RGBA to ARGB pixel format
g_image = (uint32_t*)montauk::malloc((uint64_t)w * h * 4);
if (!g_image) {
stbi_image_free(rgb);
stbi_image_free(rgba);
montauk::strcpy(g_status, "Error: out of memory for image");
return false;
}
for (int i = 0; i < w * h; i++) {
uint8_t r = rgb[i * 3 + 0];
uint8_t g = rgb[i * 3 + 1];
uint8_t b = rgb[i * 3 + 2];
g_image[i] = 0xFF000000u | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
uint8_t r = rgba[i * 4 + 0];
uint8_t g = rgba[i * 4 + 1];
uint8_t b = rgba[i * 4 + 2];
uint8_t a = rgba[i * 4 + 3];
g_image[i] = ((uint32_t)a << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
}
stbi_image_free(rgb);
stbi_image_free(rgba);
g_img_w = w;
g_img_h = h;
snprintf(g_status, 256, "%s %dx%d %dch", basename(path), w, h, channels);
return true;
}
// ============================================================================
// Pan clamping
// Zoom and pan
// ============================================================================
static int viewport_h() { return g_win_h - TOOLBAR_H - STATUS_BAR_H; }
static void clamp_pan() {
// If image fits in viewport, center it
if (g_img_w <= g_win_w) {
g_pan_x = (g_win_w - g_img_w) / 2;
int scaled_w = (int)(g_img_w * g_zoom);
int scaled_h = (int)(g_img_h * g_zoom);
int vp_h = viewport_h();
if (scaled_w <= g_win_w) {
g_pan_x = (g_win_w - scaled_w) / 2;
} else {
// Clamp so image edges don't leave the viewport
if (g_pan_x > 0) g_pan_x = 0;
if (g_pan_x < g_win_w - g_img_w) g_pan_x = g_win_w - g_img_w;
if (g_pan_x < g_win_w - scaled_w) g_pan_x = g_win_w - scaled_w;
}
if (g_img_h <= g_win_h) {
g_pan_y = (g_win_h - g_img_h) / 2;
if (scaled_h <= vp_h) {
g_pan_y = (vp_h - scaled_h) / 2 + TOOLBAR_H;
} else {
if (g_pan_y > 0) g_pan_y = 0;
if (g_pan_y < g_win_h - g_img_h) g_pan_y = g_win_h - g_img_h;
if (g_pan_y > TOOLBAR_H) g_pan_y = TOOLBAR_H;
if (g_pan_y < TOOLBAR_H + vp_h - scaled_h) g_pan_y = TOOLBAR_H + vp_h - scaled_h;
}
}
static void center_image() {
g_pan_x = (g_win_w - g_img_w) / 2;
g_pan_y = (g_win_h - g_img_h) / 2;
int scaled_w = (int)(g_img_w * g_zoom);
int scaled_h = (int)(g_img_h * g_zoom);
int vp_h = viewport_h();
g_pan_x = (g_win_w - scaled_w) / 2;
g_pan_y = (vp_h - scaled_h) / 2 + TOOLBAR_H;
clamp_pan();
}
static void zoom_to(float new_zoom, int focus_x, int focus_y) {
if (new_zoom < ZOOM_MIN) new_zoom = ZOOM_MIN;
if (new_zoom > ZOOM_MAX) new_zoom = ZOOM_MAX;
if (new_zoom == g_zoom) return;
// Zoom toward the focus point (mouse position or center)
float ratio = new_zoom / g_zoom;
g_pan_x = focus_x - (int)((focus_x - g_pan_x) * ratio);
g_pan_y = focus_y - (int)((focus_y - g_pan_y) * ratio);
g_zoom = new_zoom;
clamp_pan();
}
static void zoom_in(int fx, int fy) {
// Step to next "nice" level
float next;
if (g_zoom < 0.1f) next = g_zoom + 0.05f;
else if (g_zoom < 0.5f) next = g_zoom + 0.1f;
else if (g_zoom < 2.0f) next = g_zoom + 0.25f;
else if (g_zoom < 4.0f) next = g_zoom + 0.5f;
else next = g_zoom + 1.0f;
zoom_to(next, fx, fy);
}
static void zoom_out(int fx, int fy) {
float next;
if (g_zoom <= 0.1f) next = g_zoom - 0.05f;
else if (g_zoom <= 0.5f) next = g_zoom - 0.1f;
else if (g_zoom <= 2.0f) next = g_zoom - 0.25f;
else if (g_zoom <= 4.0f) next = g_zoom - 0.5f;
else next = g_zoom - 1.0f;
zoom_to(next, fx, fy);
}
static void zoom_fit() {
if (!g_load_ok) return;
int vp_h = viewport_h();
float zx = (float)g_win_w / g_img_w;
float zy = (float)vp_h / g_img_h;
g_zoom = zx < zy ? zx : zy;
if (g_zoom > ZOOM_MAX) g_zoom = ZOOM_MAX;
center_image();
}
static void zoom_actual() {
int cx = g_win_w / 2;
int cy = TOOLBAR_H + viewport_h() / 2;
zoom_to(1.0f, cx, cy);
}
// ============================================================================
// Rendering
// ============================================================================
static void render(uint32_t* pixels) {
// Fill background
px_fill(pixels, g_win_w, g_win_h, 0, 0, g_win_w, g_win_h, BG_COLOR);
int vp_y0 = TOOLBAR_H;
int vp_y1 = g_win_h - STATUS_BAR_H;
// Draw image
// Fill viewport background
px_fill(pixels, g_win_w, g_win_h, 0, vp_y0, g_win_w, vp_y1 - vp_y0, BG_COLOR);
// Draw scaled image
if (g_image && g_load_ok) {
for (int row = 0; row < g_img_h; row++) {
int dy = g_pan_y + row;
if (dy < 0 || dy >= g_win_h) continue;
for (int col = 0; col < g_img_w; col++) {
int dx = g_pan_x + col;
if (dx < 0 || dx >= g_win_w) continue;
pixels[dy * g_win_w + dx] = g_image[row * g_img_w + col];
int scaled_w = (int)(g_img_w * g_zoom);
int scaled_h = (int)(g_img_h * g_zoom);
// Viewport-clipped drawing region
int draw_x0 = g_pan_x < 0 ? 0 : g_pan_x;
int draw_y0 = g_pan_y < vp_y0 ? vp_y0 : g_pan_y;
int draw_x1 = g_pan_x + scaled_w > g_win_w ? g_win_w : g_pan_x + scaled_w;
int draw_y1 = g_pan_y + scaled_h > vp_y1 ? vp_y1 : g_pan_y + scaled_h;
float inv_zoom = 1.0f / g_zoom;
for (int dy = draw_y0; dy < draw_y1; dy++) {
int src_y = (int)((dy - g_pan_y) * inv_zoom);
if (src_y < 0) src_y = 0;
if (src_y >= g_img_h) src_y = g_img_h - 1;
const uint32_t* src_row = &g_image[src_y * g_img_w];
uint32_t* dst_row = &pixels[dy * g_win_w];
for (int dx = draw_x0; dx < draw_x1; dx++) {
int src_x = (int)((dx - g_pan_x) * inv_zoom);
if (src_x < 0) src_x = 0;
if (src_x >= g_img_w) src_x = g_img_w - 1;
uint32_t spx = src_row[src_x];
uint8_t a = (spx >> 24) & 0xFF;
if (a == 255) {
dst_row[dx] = spx | 0xFF000000u;
} else if (a > 0) {
// Alpha blend over checkerboard
int cx = (dx >> 3) & 1;
int cy = (dy >> 3) & 1;
uint32_t check = (cx ^ cy) ? CHECK_LIGHT.to_pixel() : CHECK_DARK.to_pixel();
uint8_t br = (check >> 16) & 0xFF;
uint8_t bg = (check >> 8) & 0xFF;
uint8_t bb = check & 0xFF;
uint8_t sr = (spx >> 16) & 0xFF;
uint8_t sg = (spx >> 8) & 0xFF;
uint8_t sb = spx & 0xFF;
uint32_t inv = 255 - a;
uint8_t rr = (a * sr + inv * br + 128) / 255;
uint8_t rg = (a * sg + inv * bg + 128) / 255;
uint8_t rb = (a * sb + inv * bb + 128) / 255;
dst_row[dx] = 0xFF000000u | ((uint32_t)rr << 16) | ((uint32_t)rg << 8) | rb;
} else {
// Fully transparent — show checkerboard
int cx = (dx >> 3) & 1;
int cy = (dy >> 3) & 1;
dst_row[dx] = (cx ^ cy) ? CHECK_LIGHT.to_pixel() : CHECK_DARK.to_pixel();
}
}
}
} else if (!g_load_ok && g_font) {
// Show error message centered
g_font->draw_to_buffer(pixels, g_win_w, g_win_h,
20, g_win_h / 2 - 8, g_status, ERR_COLOR, 15);
20, vp_y0 + (vp_y1 - vp_y0) / 2 - 8, g_status, ERR_COLOR, 15);
}
// ---- Toolbar ----
px_fill(pixels, g_win_w, g_win_h, 0, 0, g_win_w, TOOLBAR_H, TOOLBAR_BG);
px_hline(pixels, g_win_w, g_win_h, 0, TOOLBAR_H - 1, g_win_w, GRID_COLOR);
int bx = 4;
auto tb_btn = [&](int w, bool active, const char* label, int& x0_out, int& x1_out) {
x0_out = bx;
x1_out = bx + w;
Color bg = active ? TB_BTN_ACTIVE : TB_BTN_BG;
px_fill_rounded(pixels, g_win_w, g_win_h, bx, TB_BTN_Y, w, TB_BTN_SIZE, TB_BTN_RAD, bg);
if (g_font && label[0]) {
int tw = g_font->measure_text(label, HEADER_FONT);
g_font->draw_to_buffer(pixels, g_win_w, g_win_h,
bx + (w - tw) / 2, TB_BTN_Y + (TB_BTN_SIZE - HEADER_FONT) / 2,
label, HEADER_TEXT, HEADER_FONT);
}
bx += w + 4;
};
auto tb_sep = [&]() {
px_vline(pixels, g_win_w, g_win_h, bx, 6, TOOLBAR_H - 12, TB_SEP_COLOR);
bx += 8;
};
// Open
tb_btn(36, false, "Open", tb_open_x0, tb_open_x1);
tb_sep();
// Zoom controls
tb_btn(24, false, "-", tb_zoom_out_x0, tb_zoom_out_x1);
tb_btn(24, false, "+", tb_zoom_in_x0, tb_zoom_in_x1);
// Zoom percentage label
{
char zoom_label[16];
int pct = (int)(g_zoom * 100 + 0.5f);
snprintf(zoom_label, 16, "%d%%", pct);
if (g_font) {
int tw = g_font->measure_text(zoom_label, HEADER_FONT);
g_font->draw_to_buffer(pixels, g_win_w, g_win_h,
bx, TB_BTN_Y + (TB_BTN_SIZE - HEADER_FONT) / 2,
zoom_label, HEADER_TEXT, HEADER_FONT);
bx += tw + 8;
}
}
tb_sep();
// Fit / 1:1
tb_btn(28, false, "Fit", tb_fit_x0, tb_fit_x1);
tb_btn(28, false, "1:1", tb_actual_x0, tb_actual_x1);
// ---- Status bar ----
int sy = g_win_h - STATUS_BAR_H;
px_fill(pixels, g_win_w, g_win_h, 0, sy, g_win_w, STATUS_BAR_H, STATUS_BG);
if (g_font) {
int sty = sy + (STATUS_BAR_H - HEADER_FONT) / 2;
// Left: filename and dimensions
if (g_load_ok && g_status[0]) {
g_font->draw_to_buffer(pixels, g_win_w, g_win_h, 8, sty,
g_status, STATUS_TEXT, HEADER_FONT);
} else if (!g_load_ok) {
g_font->draw_to_buffer(pixels, g_win_w, g_win_h, 8, sty,
"No image loaded", STATUS_TEXT, HEADER_FONT);
}
// Right: zoom level
if (g_load_ok) {
char right[32];
int pct = (int)(g_zoom * 100 + 0.5f);
snprintf(right, 32, "%d%% ", pct);
int rw = g_font->measure_text(right, HEADER_FONT);
g_font->draw_to_buffer(pixels, g_win_w, g_win_h,
g_win_w - rw - 8, sty, right, STATUS_TEXT, HEADER_FONT);
}
}
}
// ============================================================================
// Toolbar hit test
// ============================================================================
static bool handle_toolbar_click(int mx, int my) {
if (my >= TOOLBAR_H || my < TB_BTN_Y || my >= TB_BTN_Y + TB_BTN_SIZE) return false;
int cx = g_win_w / 2;
int cy = TOOLBAR_H + viewport_h() / 2;
if (mx >= tb_open_x0 && mx < tb_open_x1) {
// TODO: open file dialog
return true;
}
if (mx >= tb_zoom_out_x0 && mx < tb_zoom_out_x1) {
zoom_out(cx, cy);
return true;
}
if (mx >= tb_zoom_in_x0 && mx < tb_zoom_in_x1) {
zoom_in(cx, cy);
return true;
}
if (mx >= tb_fit_x0 && mx < tb_fit_x1) {
zoom_fit();
return true;
}
if (mx >= tb_actual_x0 && mx < tb_actual_x1) {
zoom_actual();
return true;
}
return false;
}
// ============================================================================
@@ -241,46 +499,33 @@ static void render(uint32_t* pixels) {
extern "C" void _start() {
// Get file path from arguments
char filepath[512] = {};
int arglen = montauk::getargs(filepath, sizeof(filepath));
if (arglen <= 0) {
montauk::strcpy(filepath, "");
}
int arglen = montauk::getargs(g_filepath, sizeof(g_filepath));
if (arglen <= 0) g_filepath[0] = '\0';
// Load font
auto load_font = [](const char* path) -> TrueTypeFont* {
{
TrueTypeFont* f = (TrueTypeFont*)montauk::malloc(sizeof(TrueTypeFont));
if (!f) return nullptr;
montauk::memset(f, 0, sizeof(TrueTypeFont));
if (!f->init(path)) { montauk::mfree(f); return nullptr; }
return f;
};
g_font = load_font("0:/fonts/Roboto-Medium.ttf");
if (f) {
montauk::memset(f, 0, sizeof(TrueTypeFont));
if (!f->init("0:/fonts/Roboto-Medium.ttf")) { montauk::mfree(f); f = nullptr; }
}
g_font = f;
}
// Load image before creating window so dimensions are available for title
if (filepath[0]) {
g_load_ok = load_image(filepath);
// Load image
if (g_filepath[0]) {
g_load_ok = load_image(g_filepath);
} else {
montauk::strcpy(g_status, "No file specified");
g_load_ok = false;
}
// Build window title: "filename.jpg (1920 x 1080)" or just "Image Viewer"
// Build window title
char title[128] = "Image Viewer";
if (filepath[0]) {
const char* name = basename(filepath);
if (g_filepath[0]) {
const char* name = basename(g_filepath);
if (name[0]) {
montauk::strcpy(title, name);
if (g_load_ok) {
str_append(title, " (", sizeof(title));
char num[16];
int_to_str(num, g_img_w);
str_append(title, num, sizeof(title));
str_append(title, " x ", sizeof(title));
int_to_str(num, g_img_h);
str_append(title, num, sizeof(title));
str_append(title, ")", sizeof(title));
}
snprintf(title, sizeof(title), "%s (%dx%d)", name, g_img_w, g_img_h);
}
}
@@ -292,10 +537,15 @@ extern "C" void _start() {
int win_id = wres.id;
uint32_t* pixels = (uint32_t*)(uintptr_t)wres.pixelVa;
// Center image initially
if (g_load_ok) center_image();
// Auto-fit on load if image is larger than viewport
if (g_load_ok) {
if (g_img_w > g_win_w || g_img_h > viewport_h()) {
zoom_fit();
} else {
center_image();
}
}
// Initial render
render(pixels);
montauk::win_present(win_id);
@@ -305,16 +555,11 @@ extern "C" void _start() {
int r = montauk::win_poll(win_id, &ev);
if (r < 0) break;
if (r == 0) { montauk::sleep_ms(16); continue; }
if (r == 0) {
montauk::sleep_ms(16);
continue;
}
if (ev.type == 3) break; // close
// Close event
if (ev.type == 3) break;
// Resize event
// Resize
if (ev.type == 2) {
g_win_w = ev.resize.w;
g_win_h = ev.resize.h;
@@ -325,51 +570,64 @@ extern "C" void _start() {
continue;
}
// Key event
if (ev.type == 0 && ev.key.pressed) {
bool redraw = false;
bool redraw = false;
// Q or Escape to close
if (ev.key.ascii == 'q' || ev.key.ascii == 'Q' || ev.key.scancode == 0x01) {
break;
}
// Keyboard
if (ev.type == 0 && ev.key.pressed) {
auto& key = ev.key;
int cx = g_win_w / 2;
int cy = TOOLBAR_H + viewport_h() / 2;
if (key.ascii == 'q' || key.ascii == 'Q' || key.scancode == 0x01) break;
// Zoom keys
if (key.ascii == '+' || key.ascii == '=') { zoom_in(cx, cy); redraw = true; }
else if (key.ascii == '-') { zoom_out(cx, cy); redraw = true; }
else if (key.ascii == '0') { zoom_fit(); redraw = true; }
else if (key.ascii == '1') { zoom_actual(); redraw = true; }
// Ctrl+= / Ctrl+-
else if (key.ctrl && (key.ascii == '+' || key.ascii == '=' || key.ascii == 29)) { zoom_in(cx, cy); redraw = true; }
else if (key.ctrl && (key.ascii == '-' || key.ascii == 31)) { zoom_out(cx, cy); redraw = true; }
// Arrow keys to pan
if (ev.key.scancode == 0x48) { g_pan_y += PAN_STEP; redraw = true; } // Up
if (ev.key.scancode == 0x50) { g_pan_y -= PAN_STEP; redraw = true; } // Down
if (ev.key.scancode == 0x4B) { g_pan_x += PAN_STEP; redraw = true; } // Left
if (ev.key.scancode == 0x4D) { g_pan_x -= PAN_STEP; redraw = true; } // Right
else if (key.scancode == 0x48) { g_pan_y += PAN_STEP; redraw = true; }
else if (key.scancode == 0x50) { g_pan_y -= PAN_STEP; redraw = true; }
else if (key.scancode == 0x4B) { g_pan_x += PAN_STEP; redraw = true; }
else if (key.scancode == 0x4D) { g_pan_x -= PAN_STEP; redraw = true; }
// Home key to re-center
if (ev.key.scancode == 0x47) { center_image(); redraw = true; }
// Home to center
else if (key.scancode == 0x47) { center_image(); redraw = true; }
if (redraw && g_load_ok) {
clamp_pan();
render(pixels);
montauk::win_present(win_id);
}
continue;
if (redraw && g_load_ok) clamp_pan();
}
// Mouse event
// Mouse
if (ev.type == 1) {
bool redraw = false;
int mx = ev.mouse.x;
int my = ev.mouse.y;
bool left_now = ev.mouse.buttons & 1;
bool left_prev = ev.mouse.prev_buttons & 1;
bool clicked = left_now && !left_prev;
// Start drag
if (left_now && !left_prev) {
// Toolbar click
if (clicked && my < TOOLBAR_H) {
if (handle_toolbar_click(mx, my))
redraw = true;
}
// Start drag (in viewport area)
else if (clicked && my >= TOOLBAR_H && my < g_win_h - STATUS_BAR_H) {
g_dragging = true;
g_drag_start_x = ev.mouse.x;
g_drag_start_y = ev.mouse.y;
g_drag_start_x = mx;
g_drag_start_y = my;
g_drag_pan_x = g_pan_x;
g_drag_pan_y = g_pan_y;
}
// Continue drag
if (left_now && g_dragging) {
g_pan_x = g_drag_pan_x + (ev.mouse.x - g_drag_start_x);
g_pan_y = g_drag_pan_y + (ev.mouse.y - g_drag_start_y);
g_pan_x = g_drag_pan_x + (mx - g_drag_start_x);
g_pan_y = g_drag_pan_y + (my - g_drag_start_y);
redraw = true;
}
@@ -378,22 +636,22 @@ extern "C" void _start() {
g_dragging = false;
}
// Scroll wheel for vertical pan
if (ev.mouse.scroll != 0) {
g_pan_y += ev.mouse.scroll * PAN_STEP;
// Scroll wheel zooms toward mouse position
if (ev.mouse.scroll != 0 && my >= TOOLBAR_H && my < g_win_h - STATUS_BAR_H) {
if (ev.mouse.scroll > 0) zoom_in(mx, my);
else zoom_out(mx, my);
redraw = true;
}
if (redraw && g_load_ok) {
clamp_pan();
render(pixels);
montauk::win_present(win_id);
}
continue;
if (redraw && g_load_ok) clamp_pan();
}
if (redraw) {
render(pixels);
montauk::win_present(win_id);
}
}
// Cleanup
if (g_image) montauk::mfree(g_image);
montauk::win_destroy(win_id);
montauk::exit(0);