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Cram
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add premultiply option
continuous-integration/drone/push Build is passing Details

pull/2/head
cosmonaut 2023-08-22 01:38:21 -07:00
parent 05ffce873b
commit 597d8628d7
2 changed files with 24 additions and 2 deletions
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4
README.md
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@ -11,13 +11,15 @@ Cram ships with a default command line interface implemented in C, but if you wi
Command Line Usage
-----
```sh
Usage: cramcli input_dir output_dir atlas_name [--padding padding_value] [--notrim] [--dimension max_dimension]
Usage: cramcli input_dir output_dir atlas_name [--padding padding_value] [--premultiply] [--notrim] [--dimension max_dimension]
```
Cram CLI expects input images to be in PNG format and will output a PNG and a JSON metadata file that you can use to properly display the images in your game. Cram will recursively walk all the subdirectories of `input_dir` to generate your texture atlas.
Padding is set to 0 by default. If you need to use linear filtering, set padding to at least 1. If you need to use texture compression, set padding to at least 4.
Premultiply is off by default. If you will be using linear filtering on these images, you should turn this on or you will get strange artifacts.
Trimming is on by default. Use `--notrim` if for some weird reason you want it off.
Max dimension value is set to 8192 by default since that is a common max texture size for basically every GPU out there. Use `--dimension [max_dimension]` to override this maximum.

22
tools/cli/main.c
View File

@ -89,7 +89,7 @@ static void dirwalk(char *dir)
void print_help()
{
fprintf(stdout, "Usage: cram input_dir output_dir atlas_name [--padding padding_value] [--notrim] [--dimension max_dimension]");
fprintf(stdout, "Usage: cram input_dir output_dir atlas_name [--padding padding_value] [--premultiply] [--notrim] [--dimension max_dimension]");
}
uint8_t check_dir_exists(char *path)
@ -137,6 +137,8 @@ int main(int argc, char *argv[])
uint8_t *pixelData;
int32_t width;
int32_t height;
uint8_t premultiply;
uint8_t alpha;
char *arg;
char *inputDirPath = NULL;
char *outputDirPath = NULL;
@ -156,6 +158,7 @@ int main(int argc, char *argv[])
createInfo.trim = 1;
createInfo.maxDimension = 8192;
createInfo.name = NULL;
premultiply = 0;
if (argc < 2)
{
@ -177,6 +180,10 @@ int main(int argc, char *argv[])
return 1;
}
}
else if (strcmp(arg, "--premultiply") == 0)
{
premultiply = 1;
}
else if (strcmp(arg, "--notrim") == 0)
{
createInfo.trim = 0;
@ -245,6 +252,19 @@ int main(int argc, char *argv[])
/* output pixel data */
Cram_GetPixelData(context, &pixelData, &width, &height);
if (premultiply)
{
for (i = 0; i < width * height * 4; i += 4)
{
alpha = pixelData[i + 3];
pixelData[i + 0] = (uint8_t) (((uint32_t) (pixelData[i + 0]) * alpha) / 255);
pixelData[i + 1] = (uint8_t) (((uint32_t) (pixelData[i + 1]) * alpha) / 255);
pixelData[i + 2] = (uint8_t) (((uint32_t) (pixelData[i + 2]) * alpha) / 255);
}
}
imageOutputFilename = malloc(strlen(outputDirPath) + strlen(createInfo.name) + 6);
strcpy(imageOutputFilename, outputDirPath);
strcat(imageOutputFilename, separatorString);