diff options
Diffstat (limited to 'bitmap.h')
| -rw-r--r-- | bitmap.h | 26 |
1 files changed, 21 insertions, 5 deletions
@@ -16,6 +16,11 @@ #define COLORMIX_OVERFLOW_CHECK +enum text_policy { + hard = 0, // cut off overflown parts + newline = 1, // write overflown characters to new line +}; + //// T is some unsigned integer //template<typename T> //T saturate_add(T a, T b) { @@ -219,7 +224,7 @@ public: // Draw text on the image. Supports limited visual ASCII characters. void print(const std::string &s, const pixel<T> &color, - unsigned x, unsigned y, unsigned scale = 1, double alpha = 1.0); + unsigned x, unsigned y, text_policy policy, unsigned scale = 1, double alpha = 1.0); bool normalized() const { return false; @@ -269,17 +274,28 @@ void bitmap<T>::write_plain_ppm(std::ostream &out) const { template<typename T> void bitmap<T>::print(const std::string &s, const pixel<T> &color, - unsigned x, unsigned y, unsigned scale, double alpha) { + unsigned x, unsigned y, text_policy policy, unsigned scale, double alpha) { assert(alpha >= 0); assert(alpha <= 1); const unsigned char_w = 8 * scale, char_h = 13 * scale; // char width and height - size_t n = 0; + size_t n = 0; // written characters for (const auto &c: s) { unsigned int idx = c - 32U; if (idx >= 95) idx = 1; // replace invisible chars with '!' - const unsigned char_x = x + n * char_w + ((n > 1) ? ((n - 1) * scale) : 0); - const unsigned char_y = y; + unsigned char_x, char_y; + const unsigned spacing = ((n > 1) ? ((n - 1) * scale) : 0); // total spacing between characters + if (policy == text_policy::hard) { + char_x = x + n * char_w + spacing; + char_y = y; + } else if (policy == text_policy::newline) { + const auto newlines = (n * char_w + spacing + char_w - 1) / (width - x); + char_x = (x + n * char_w + spacing) % (width - x); + char_y = y + newlines * char_h + ((newlines > 0) ? ((newlines - 1) * scale) : 0); + } else { + abort(); // unknown policy + } + // char size is 13x8, stored line by line, from the bottom line to the top line // every line is represented in a single byte |