feat: PDF viewer

2026-03-06 08:00:57 +01:00
parent ead7d296f7
commit b148f0605a
12 changed files with 3127 additions and 17 deletions
@@ -0,0 +1,97 @@
+/*
+ * helpers.cpp
+ * Pixel drawing and string helpers
+ * Copyright (c) 2026 Daniel Hammer
+ */
+
+#include "pdfviewer.h"
+
+void px_fill(uint32_t* px, int bw, int bh,
+             int x, int y, int w, int h, Color c) {
+    uint32_t v = c.to_pixel();
+    int x0 = x < 0 ? 0 : x, y0 = y < 0 ? 0 : y;
+    int x1 = x + w > bw ? bw : x + w;
+    int y1 = y + h > bh ? bh : y + h;
+    for (int row = y0; row < y1; row++)
+        for (int col = x0; col < x1; col++)
+            px[row * bw + col] = v;
+}
+
+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;
+}
+
+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;
+}
+
+void px_rect(uint32_t* px, int bw, int bh,
+             int x, int y, int w, int h, Color c) {
+    px_hline(px, bw, bh, x, y, w, c);
+    px_hline(px, bw, bh, x, y + h - 1, w, c);
+    px_vline(px, bw, bh, x, y, h, c);
+    px_vline(px, bw, bh, x + w - 1, y, h, c);
+}
+
+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 py = y + row;
+        if (py < 0 || py >= bh) continue;
+        int inset = 0;
+        if (row < r) {
+            int dy = r - 1 - row;
+            if (r == 3) {
+                if (dy >= 2) inset = 2;
+                else if (dy >= 1) inset = 1;
+            } else {
+                for (int i = r; i > 0; i--) {
+                    int dx = r - i;
+                    if (dx * dx + dy * dy < r * r) { inset = i; break; }
+                }
+            }
+        } else if (row >= h - r) {
+            int dy = row - (h - r);
+            if (r == 3) {
+                if (dy >= 2) inset = 2;
+                else if (dy >= 1) inset = 1;
+            } else {
+                for (int i = r; i > 0; i--) {
+                    int dx = r - i;
+                    if (dx * dx + dy * dy < r * r) { inset = i; break; }
+                }
+            }
+        }
+        int x0 = x + inset;
+        int x1 = x + w - inset;
+        if (x0 < 0) x0 = 0;
+        if (x1 > bw) x1 = bw;
+        for (int col = x0; col < x1; col++)
+            px[py * bw + col] = v;
+    }
+}
+
+int str_len(const char* s) {
+    int n = 0;
+    while (s[n]) n++;
+    return n;
+}
+
+void str_cpy(char* dst, const char* src, int max) {
+    int i = 0;
+    while (src[i] && i < max - 1) { dst[i] = src[i]; i++; }
+    dst[i] = '\0';
+}