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Began implementing modify capabilities.

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This commit is contained in:
Aaron Helton
2017-04-20 19:44:28 -04:00
parent 2298aa9d77
commit 2cf8b20176
2 changed files with 39 additions and 6 deletions
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4
include/TGAImage.h
View File

@@ -73,4 +73,8 @@ uint8_t tga_get_red_at(TGAImage *image, uint16_t x, uint16_t y);
uint8_t tga_get_green_at(TGAImage *image, uint16_t x, uint16_t y);
uint8_t tga_get_blue_at(TGAImage *image, uint16_t x, uint16_t y);
uint8_t tga_set_red_at(TGAImage *img, uint16_t x, uint16_t y, uint8_t red);
uint8_t tga_set_green_at(TGAImage *img, uint16_t x, uint16_t y, uint8_t green);
uint8_t tga_set_blue_at(TGAImage *img, uint16_t x, uint16_t y, uint8_t blue);
#endif/*__NY_TGA_FILE*/

41
src/TGAImage.c
View File

@@ -220,18 +220,27 @@ error:
return 0;
}
/* TODO: Implement for all pixel depths and TGA Types */
/* IMPLEMENTED: TGA_TRUECOLOR, TGA_MONOCHROME */
static uint8_t *_get_pixel_point_at(TGAImage *image, uint16_t x, uint16_t y)
{
uint8_t depth_mult = (image->_meta->pixel_depth + ((uint8_t)7)) /(uint8_t)8;
uint32_t row_width = image->_meta->width * depth_mult;
return image->data + (y * row_width) + (x * depth_mult);
uint8_t depth = (uint8_t)(tga_get_pixel_depth(image)+7)/8;
uint32_t row_width = tga_get_width(image)*depth;
return image->data + (y * row_width) + (x * depth);
}
uint8_t tga_get_red_at(TGAImage *image, uint16_t x, uint16_t y)
{
check(_tga_sanity(image), TGA_INV_IMAGE_PNT, "Invalid TGAImage Passed.");
/*check(tga_get_image_type(image) != TGA_MONOCHROME &&
tga_get_image_type(image) != TGA_ENCODED_MONOCHROME,
TGA_IMAGE_TYPE_ERR,
"Attempted to get red channel on Monochrome image.");*/
uint8_t *pixel = _get_pixel_point_at(image, x, y);
switch(image->_meta->pixel_depth)
uint8_t calc_depth =
tga_get_pixel_depth(image)-tga_get_attribute_bits(image);
switch(calc_depth)
{
case 8:
return pixel[0];
@@ -250,7 +259,7 @@ uint8_t tga_get_green_at(TGAImage *image, uint16_t x, uint16_t y)
{
check(_tga_sanity(image), TGA_INV_IMAGE_PNT, "Invalid TGAImage Passed.");
uint8_t *pixel = _get_pixel_point_at(image, x, y);
switch(image->_meta->pixel_depth)
switch(tga_get_pixel_depth(image))
{
case 8:
return pixel[0];
@@ -269,7 +278,7 @@ uint8_t tga_get_blue_at(TGAImage *image, uint16_t x, uint16_t y)
{
check(_tga_sanity(image), TGA_INV_IMAGE_PNT, "Invalid TGAImage Passed.");
uint8_t *pixel = _get_pixel_point_at(image, x, y);
switch(image->_meta->pixel_depth)
switch(tga_get_pixel_depth(image))
{
case 8:
return pixel[0];
@@ -284,6 +293,26 @@ error:
return 0;
}
/* TODO: THIS IS NOT FINISHED! */
uint8_t tga_set_red_at(TGAImage *image, uint16_t x, uint16_t y, uint8_t red)
{
uint8_t *pixel = _get_pixel_point_at(image, x, y);
switch(tga_get_pixel_depth(image))
{
case 24:
pixel[2] = red;
break;
case 32:
pixel[3] = red;
break;
default:
fail(TGA_UNSUPPORTED, "Not Supported Depth Yet.");
}
return 1;
error:
return 0;
}
TGAError tga_error(void)
{
return tga_err;