ref: 4893d28186ce7ba50847b7c538dedb2e3ce45c9c
dir: /vp8/common/textblit.c/
/* * Copyright (c) 2010 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #include <stdlib.h> void vp8_blit_text(const char *msg, unsigned char *address, const int pitch) { int letter_bitmap; unsigned char *output_pos = address; int colpos; const int font[] = { 0x0, 0x5C00, 0x8020, 0xAFABEA, 0xD7EC0, 0x1111111, 0x1855740, 0x18000, 0x45C0, 0x74400, 0x51140, 0x23880, 0xC4000, 0x21080, 0x80000, 0x111110, 0xE9D72E, 0x87E40, 0x12AD732, 0xAAD62A, 0x4F94C4, 0x4D6B7, 0x456AA, 0x3E8423, 0xAAD6AA, 0xAAD6A2, 0x2800, 0x2A00, 0x8A880, 0x52940, 0x22A20, 0x15422, 0x6AD62E, 0x1E4A53E, 0xAAD6BF, 0x8C62E, 0xE8C63F, 0x118D6BF, 0x1094BF, 0xCAC62E, 0x1F2109F, 0x118FE31, 0xF8C628, 0x8A89F, 0x108421F, 0x1F1105F, 0x1F4105F, 0xE8C62E, 0x2294BF, 0x164C62E, 0x12694BF, 0x8AD6A2, 0x10FC21, 0x1F8421F, 0x744107, 0xF8220F, 0x1151151, 0x117041, 0x119D731, 0x47E0, 0x1041041, 0xFC400, 0x10440, 0x1084210, 0x820 }; colpos = 0; while (msg[colpos] != 0) { char letter = msg[colpos]; int fontcol, fontrow; if (letter <= 'Z' && letter >= ' ') letter_bitmap = font[letter-' ']; else if (letter <= 'z' && letter >= 'a') letter_bitmap = font[letter-'a'+'A' - ' ']; else letter_bitmap = font[0]; for (fontcol = 6; fontcol >= 0 ; fontcol--) for (fontrow = 0; fontrow < 5; fontrow++) output_pos[fontrow *pitch + fontcol] = ((letter_bitmap >> (fontcol * 5)) & (1 << fontrow) ? 255 : 0); output_pos += 7; colpos++; } } static void plot (const int x, const int y, unsigned char *image, const int pitch) { image [x+y*pitch] ^= 255; } /* Bresenham line algorithm */ void vp8_blit_line(int x0, int x1, int y0, int y1, unsigned char *image, const int pitch) { int steep = abs(y1 - y0) > abs(x1 - x0); int deltax, deltay; int error, ystep, y, x; if (steep) { int t; t = x0; x0 = y0; y0 = t; t = x1; x1 = y1; y1 = t; } if (x0 > x1) { int t; t = x0; x0 = x1; x1 = t; t = y0; y0 = y1; y1 = t; } deltax = x1 - x0; deltay = abs(y1 - y0); error = deltax / 2; y = y0; if (y0 < y1) ystep = 1; else ystep = -1; if (steep) { for (x = x0; x <= x1; x++) { plot(y,x, image, pitch); error = error - deltay; if (error < 0) { y = y + ystep; error = error + deltax; } } } else { for (x = x0; x <= x1; x++) { plot(x,y, image, pitch); error = error - deltay; if (error < 0) { y = y + ystep; error = error + deltax; } } } }