mirror of
https://github.com/LNH-team/pico-loader.git
synced 2026-01-10 08:29:29 +01:00
105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
#include "common.h"
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#include "nitroFont2.h"
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bool nft2_unpack(nft2_header_t* font)
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{
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if (font->signature != NFT2_SIGNATURE)
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return false;
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font->glyphInfoPtr = (const nft2_glyph_t*)((u32)font + (u32)font->glyphInfoPtr);
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font->charMapPtr = (const nft2_char_map_entry_t*)((u32)font + (u32)font->charMapPtr);
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font->glyphDataPtr = (const u8*)((u32)font + (u32)font->glyphDataPtr);
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return true;
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}
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int nft2_findGlyphIdxForCharacter(const nft2_header_t* font, u16 character)
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{
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const nft2_char_map_entry_t* charMapEntry = font->charMapPtr;
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while (charMapEntry->count > 0)
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{
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if (charMapEntry->startChar <= character && character < charMapEntry->startChar + charMapEntry->count)
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return charMapEntry->glyphs[character - charMapEntry->startChar];
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charMapEntry = (const nft2_char_map_entry_t*)((u32)charMapEntry + 4 + 2 * charMapEntry->count);
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}
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return 0;
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}
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static inline void renderGlyph(const nft2_header_t* font, const nft2_glyph_t* glyph,
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int xPos, int yPos, int width, int height, u8* dst, u32 stride)
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{
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int yOffset = glyph->spacingTop;
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u32 xStart = xPos < 0 ? -xPos : 0;
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u32 yStart = yPos + yOffset < 0 ? -(yPos + yOffset) : 0;
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int xEnd = glyph->glyphWidth;
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if (xPos + xEnd > width)
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{
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// by returning we only render complete glyphs
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return;
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// old code for rendering partial glyphs
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// xEnd = width - xPos;
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}
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int yEnd = glyph->glyphHeight;
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if (yPos + yOffset + yEnd > height)
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yEnd = height - (yPos + yOffset); // allow partial glyphs in the vertical direction
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const u8* glyphData = &font->glyphDataPtr[glyph->dataOffset];
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glyphData += yStart * ((glyph->glyphWidth + 1) >> 1);
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for (int y = yStart; y < yEnd; y++)
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{
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for (int x = xStart; x < xEnd; x++)
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{
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u32 data = glyphData[x >> 1];
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if ((x & 1) == 0)
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data &= 0xF;
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else
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data >>= 4;
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if (data == 0)
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continue;
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u32 finalX = x + xPos;
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u32 finalY = y + yPos + yOffset;
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dst[finalY * stride + finalX] = data;
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}
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glyphData += (glyph->glyphWidth + 1) >> 1;
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}
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}
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ITCM_CODE void nft2_renderString(const nft2_header_t* font, const char* string, u8* dst, u32 stride,
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nft2_string_render_params_t* renderParams)
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{
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int xPos = renderParams->x;
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int yPos = renderParams->y;
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u32 textWidth = 0;
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while (true)
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{
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char c = *string++;
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if (c == 0)
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break;
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if (c == '\n')
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{
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xPos = renderParams->x;
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yPos += font->ascend + font->descend + 1;
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if (yPos >= (int)renderParams->height)
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break;
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continue;
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}
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int glyphIdx = nft2_findGlyphIdxForCharacter(font, c);
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const nft2_glyph_t* glyph = &font->glyphInfoPtr[glyphIdx];
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xPos += glyph->spacingLeft;
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renderGlyph(font, glyph, xPos, yPos, renderParams->width, renderParams->height, dst, stride);
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xPos += glyph->glyphWidth;
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if (xPos > (int)textWidth)
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textWidth = xPos;
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xPos += glyph->spacingRight;
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}
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renderParams->textWidth = textWidth;
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}
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