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- added back the paletted texture readers.

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... after finding out what an inefficient and poorly working method the Build backend uses for downconverting true color textures.
This commit is contained in:
Christoph Oelckers 2019-10-11 19:21:36 +02:00
parent 14b21bab7a
commit fdbb27a796
16 changed files with 956 additions and 25 deletions
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41
source/common/textures/formats/stbtexture.cpp
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@ -47,6 +47,7 @@
#include "files.h"
#include "bitmap.h"
#include "imagehelpers.h"
#include "image.h"
#include "cache1d.h"
@ -66,6 +67,7 @@ class FStbTexture : public FImageSource
public:
FStbTexture (int w, int h);
void CreatePalettedPixels(uint8_t *destbuffer) override;
int CopyPixels(FBitmap *bmp, int conversion) override;
};
@ -114,9 +116,46 @@ FStbTexture::FStbTexture (int w, int h)
//
//==========================================================================
void FStbTexture::CreatePalettedPixels(uint8_t *buffer)
{
FBitmap bitmap;
bitmap.Create(Width, Height);
CopyPixels(&bitmap, 0);
const uint8_t *data = bitmap.GetPixels();
uint8_t *dest_p;
int dest_adv = Height;
int dest_rew = Width * Height - 1;
dest_p = buffer;
// Convert the source image from row-major to column-major format and remap it
for (int y = Height; y != 0; --y)
{
for (int x = Width; x != 0; --x)
{
int b = *data++;
int g = *data++;
int r = *data++;
int a = *data++;
if (a < 128) *dest_p = 0;
else *dest_p = ImageHelpers::RGBToPalette(false, r, g, b);
dest_p += dest_adv;
}
dest_p -= dest_rew;
}
}
//==========================================================================
//
//
//
//==========================================================================
int FStbTexture::CopyPixels(FBitmap *bmp, int conversion)
{
auto lump = kopenFileReader(Name, 0);
auto lump = kopenFileReader(Name, 0);
if (!lump.isOpen()) return -1; // Just leave the texture blank.
int x, y, chan;
auto image = stbi_load_from_callbacks(&callbacks, &lump, &x, &y, &chan, STBI_rgb_alpha);
if (image)