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use I4 instead of RGBA8 for fonts (much less memory)

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This commit is contained in:
Daryl 2020-07-25 10:23:22 -06:00
parent 09c3376827
commit 66da7346b9
2 changed files with 46 additions and 34 deletions
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78
source/utils/FreeTypeGX.cpp
View File

@ -22,6 +22,8 @@
#include "FreeTypeGX.h"
#define ALIGN8(x) (((x) + 7) & ~7)
static FT_Library ftLibrary; /**< FreeType FT_Library instance. */
static FT_Face ftFace; /**< FreeType reusable FT_Face typographic object. */
static FT_GlyphSlot ftSlot; /**< FreeType reusable FT_GlyphSlot glyph container object. */
@ -233,27 +235,30 @@ ftgxCharData *FreeTypeGX::cacheGlyphData(wchar_t charCode)
FT_UInt gIndex;
uint16_t textureWidth = 0, textureHeight = 0;
gIndex = FT_Get_Char_Index( ftFace, charCode );
if (!FT_Load_Glyph(ftFace, gIndex, FT_LOAD_DEFAULT | FT_LOAD_RENDER ))
gIndex = FT_Get_Char_Index(ftFace, (FT_ULong) charCode);
if (gIndex != 0 && FT_Load_Glyph(ftFace, gIndex, FT_LOAD_DEFAULT | FT_LOAD_RENDER) == 0)
{
if(ftSlot->format == FT_GLYPH_FORMAT_BITMAP)
{
FT_Bitmap *glyphBitmap = &ftSlot->bitmap;
textureWidth = adjustTextureWidth(glyphBitmap->width);
textureHeight = adjustTextureHeight(glyphBitmap->rows);
textureWidth = ALIGN8(glyphBitmap->width);
textureHeight = ALIGN8(glyphBitmap->rows);
if(textureWidth == 0)
textureWidth = 8;
if(textureHeight == 0)
textureHeight = 8;
this->fontData[charCode].renderOffsetX = (int16_t) ftFace->glyph->bitmap_left;
this->fontData[charCode].glyphAdvanceX = (uint16_t) (ftFace->glyph->advance.x >> 6);
this->fontData[charCode].glyphIndex = (uint32_t) gIndex;
this->fontData[charCode].textureWidth = (uint16_t) textureWidth;
this->fontData[charCode].textureHeight = (uint16_t) textureHeight;
this->fontData[charCode].renderOffsetY = (int16_t) ftFace->glyph->bitmap_top;
this->fontData[charCode].renderOffsetMax = (int16_t) ftFace->glyph->bitmap_top;
this->fontData[charCode].renderOffsetMin = (int16_t) glyphBitmap->rows - ftFace->glyph->bitmap_top;
this->fontData[charCode].glyphDataTexture = NULL;
this->fontData[charCode] = (ftgxCharData){
ftSlot->bitmap_left,
ftSlot->advance.x >> 6,
gIndex,
textureWidth,
textureHeight,
ftSlot->bitmap_top,
ftSlot->bitmap_top,
glyphBitmap->rows - ftSlot->bitmap_top,
NULL
};
this->loadGlyphData(glyphBitmap, &this->fontData[charCode]);
return &this->fontData[charCode];
@ -295,31 +300,38 @@ uint16_t FreeTypeGX::cacheGlyphDataComplete()
*/
void FreeTypeGX::loadGlyphData(FT_Bitmap *bmp, ftgxCharData *charData)
{
int length = charData->textureWidth * charData->textureHeight * 4;
int glyphSize = (charData->textureWidth * charData->textureHeight) >> 1;
uint8_t * glyphData = (uint8_t *) memalign(32, length);
if(!glyphData)
return;
memset(glyphData, 0x00, length);
uint8_t *glyphData = (uint8_t *) memalign(32, glyphSize);
memset(glyphData, 0x00, glyphSize);
uint8_t *src = (uint8_t *)bmp->buffer;
uint32_t offset;
uint8_t *dst = glyphData;
int32_t pos, x1, y1, x, y;
for (int imagePosY = 0; imagePosY < bmp->rows; ++imagePosY)
for(y1 = 0; y1 < bmp->rows; y1 += 8)
{
for (int imagePosX = 0; imagePosX < bmp->width; ++imagePosX)
for(x1 = 0; x1 < bmp->width; x1 += 8)
{
offset = ((((imagePosY >> 2) * (charData->textureWidth >> 2) + (imagePosX >> 2)) << 5) + ((imagePosY & 3) << 2) + (imagePosX & 3)) << 1;
glyphData[offset] = *src;
glyphData[offset+1] = *src;
glyphData[offset+32] = *src;
glyphData[offset+33] = *src;
++src;
for(y = y1; y < (y1 + 8); y++)
{
for(x = x1; x < (x1 + 8); x += 2, dst++)
{
if(x >= bmp->width || y >= bmp->rows)
continue;
pos = y * bmp->width + x;
*dst = (src[pos] & 0xF0);
if(x+1 < bmp->width)
*dst |= (src[pos + 1] >> 4);
}
}
}
}
DCFlushRange(glyphData, length);
charData->glyphDataTexture = (uint32_t *) glyphData;
DCFlushRange(glyphData, glyphSize);
charData->glyphDataTexture = glyphData;
}
/**
@ -430,7 +442,7 @@ uint16_t FreeTypeGX::drawText(int16_t x, int16_t y, wchar_t *text, GXColor color
x_pos += pairDelta.x >> 6;
}
GX_InitTexObj(&glyphTexture, glyphData->glyphDataTexture, glyphData->textureWidth, glyphData->textureHeight, GX_TF_RGBA8, GX_CLAMP, GX_CLAMP, GX_FALSE);
GX_InitTexObj(&glyphTexture, glyphData->glyphDataTexture, glyphData->textureWidth, glyphData->textureHeight, GX_TF_I4, GX_CLAMP, GX_CLAMP, GX_FALSE);
this->copyTextureToFramebuffer(&glyphTexture, glyphData->textureWidth, glyphData->textureHeight, x_pos + glyphData->renderOffsetX + x_offset, y - glyphData->renderOffsetY + y_offset, color);
x_pos += glyphData->glyphAdvanceX;

2
source/utils/FreeTypeGX.h
View File

@ -51,7 +51,7 @@ typedef struct ftgxCharData_ {
int16_t renderOffsetMax; /**< Texture Y axis bearing maximum value. */
int16_t renderOffsetMin; /**< Texture Y axis bearing minimum value. */
uint32_t* glyphDataTexture; /**< Glyph texture bitmap data buffer. */
uint8_t* glyphDataTexture; /**< Glyph texture bitmap data buffer. */
} ftgxCharData;
/*! \struct ftgxDataOffset_