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annotate src/fontdraw_engine.c @ 0:c84446dfb3f5

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author paulo@localhost
date Fri, 13 Mar 2009 00:39:12 -0700
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paulo@0 1 /*
paulo@0 2 Variable width font drawing library for DS (and GBA)
paulo@0 3
paulo@0 4 Copyright 2007-2008 Damian Yerrick <pinoandchester@pineight.com>
paulo@0 5
paulo@0 6 This work is provided 'as-is', without any express or implied
paulo@0 7 warranty. In no event will the authors be held liable for any
paulo@0 8 damages arising from the use of this work.
paulo@0 9
paulo@0 10 Permission is granted to anyone to use this work for any purpose,
paulo@0 11 including commercial applications, and to alter it and redistribute
paulo@0 12 it freely, subject to the following restrictions:
paulo@0 13
paulo@0 14 1. The origin of this work must not be misrepresented; you must
paulo@0 15 not claim that you wrote the original work. If you use
paulo@0 16 this work in a product, an acknowledgment in the product
paulo@0 17 documentation would be appreciated but is not required.
paulo@0 18 2. Altered source versions must be plainly marked as such, and must
paulo@0 19 not be misrepresented as being the original work.
paulo@0 20 3. This notice may not be removed or altered from any source
paulo@0 21 distribution.
paulo@0 22
paulo@0 23 "Source" is the preferred form of a work for making changes to it.
paulo@0 24
paulo@0 25 */
paulo@0 26 /*
paulo@0 27
paulo@0 28 Set FONTDRAW_SPLIT_COMPILE when compiling the time-sensitve parts
paulo@0 29 into a separate file to be placed in "fast" memory.
paulo@0 30
paulo@0 31 */
paulo@0 32
paulo@0 33
paulo@0 34 #ifdef FONTDRAW_SPLIT_COMPILE
paulo@0 35 typedef unsigned int u32;
paulo@0 36 extern const unsigned char vwfont_bin[];
paulo@0 37
paulo@0 38 typedef struct GlyphRec {
paulo@0 39 unsigned short dataOffset;
paulo@0 40 unsigned char glyphWidth;
paulo@0 41 unsigned char reserved;
paulo@0 42 } GlyphRec;
paulo@0 43 #endif
paulo@0 44
paulo@0 45 unsigned int fontdraw_putchar(u32 *dst, unsigned int colStride, int wid, int x, int glyph) {
paulo@0 46 glyph &= 0xFF;
paulo@0 47 if (glyph < vwfont_bin[1]) {
paulo@0 48 return 0;
paulo@0 49 }
paulo@0 50 glyph -= vwfont_bin[1];
paulo@0 51 if (vwfont_bin[2] != 0 && glyph >= vwfont_bin[2]) {
paulo@0 52 return 0;
paulo@0 53 }
paulo@0 54 const GlyphRec *glyphRec =
paulo@0 55 ((const GlyphRec *)(vwfont_bin + vwfont_bin[0])) + glyph;
paulo@0 56 const unsigned char *data = vwfont_bin + glyphRec->dataOffset;
paulo@0 57 unsigned int dataShift = 2;
paulo@0 58 unsigned int dataBits = *data++;
paulo@0 59 unsigned int pixelCode = dataBits & 0x03;
paulo@0 60
paulo@0 61 // Convert x to tile column address and bit address within tile
paulo@0 62 dst += colStride * (x >> 3);
paulo@0 63 x = (x & 0x07) << 2;
paulo@0 64
paulo@0 65 if (dataShift >= 8) {
paulo@0 66 dataShift = 2;
paulo@0 67 dataBits = *data++;
paulo@0 68 }
paulo@0 69
paulo@0 70 for (unsigned int height = vwfont_bin[3];
paulo@0 71 height > 0;
paulo@0 72 --height, ++dst) {
paulo@0 73 int eol = 0;
paulo@0 74 int xLine = x;
paulo@0 75 int widLeft = wid;
paulo@0 76 u32 *dstLine = dst;
paulo@0 77 u32 dstBits = *dstLine;
paulo@0 78 while (!eol) {
paulo@0 79
paulo@0 80 // Process a pixel instruction
paulo@0 81 if (pixelCode == 0) {
paulo@0 82 eol = 1;
paulo@0 83 } else if (widLeft > 0) {
paulo@0 84
paulo@0 85 // Change pixel and move to next pixel
paulo@0 86 if (pixelCode > 1) {
paulo@0 87 //dstBits &= ~(0x0F << xLine);
paulo@0 88 dstBits |= (pixelCode - 1) << xLine;
paulo@0 89 }
paulo@0 90 xLine += 4;
paulo@0 91 --widLeft;
paulo@0 92 }
paulo@0 93
paulo@0 94 // If finished with this tile, write back changed bits
paulo@0 95 if (xLine >= 32) {
paulo@0 96 xLine = 0;
paulo@0 97 *dstLine = dstBits;
paulo@0 98 dstLine += colStride;
paulo@0 99 dstBits = *dstLine;
paulo@0 100 }
paulo@0 101
paulo@0 102 // Decode next pixel instruction
paulo@0 103 if (dataShift >= 8) {
paulo@0 104 dataShift = 0;
paulo@0 105 dataBits = *data++;
paulo@0 106 }
paulo@0 107
paulo@0 108 // Decode a byte into pixel instructions
paulo@0 109 pixelCode = (dataBits >> dataShift) & 0x03;
paulo@0 110 dataShift += 2;
paulo@0 111 }
paulo@0 112
paulo@0 113 // Write back changed bits
paulo@0 114 if (xLine > 0) {
paulo@0 115 *dstLine = dstBits;
paulo@0 116 }
paulo@0 117 }
paulo@0 118 return glyphRec->glyphWidth;
paulo@0 119 }
paulo@0 120
paulo@0 121 void vwfRectfillColumn(u32 *dst, unsigned int colStride,
paulo@0 122 unsigned int l, unsigned int t,
paulo@0 123 unsigned int r, unsigned int b,
paulo@0 124 unsigned int c)
paulo@0 125 {
paulo@0 126 u32 mask = 0xffffffffU << (4 * l);
paulo@0 127 mask &= 0xffffffffU >> (4 * (8 - r));
paulo@0 128 c &= mask;
paulo@0 129 mask = ~mask;
paulo@0 130
paulo@0 131 for (; t < b; t++) {
paulo@0 132 dst[t] = (dst[t] & mask) | c;
paulo@0 133 }
paulo@0 134 }
paulo@0 135