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DOS: improve color accuracy and scaling, thanks to aliaspider

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This commit is contained in:
Brad Parker 2017-02-08 00:16:27 -05:00
parent 35f8ed82a0
commit 373535f329
1 changed files with 10 additions and 10 deletions
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20
gfx/drivers/vga_gfx.c
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@ -222,14 +222,14 @@ static bool vga_gfx_frame(void *data, const void *frame,
for (x = 0; x < VGA_WIDTH; x++)
{
/* scale incoming frame to fit the screen */
unsigned scaled_x = (width / (float)VGA_WIDTH) * x;
unsigned scaled_y = (height / (float)VGA_HEIGHT) * y;
unsigned scaled_x = (width * x) / VGA_WIDTH;
unsigned scaled_y = (height * y) / VGA_HEIGHT;
unsigned short pixel = ((unsigned short*)frame_to_copy)[width * scaled_y + scaled_x];
/* convert RGB565 to BGR332 */
unsigned r = (7.0f / 31.0f) * ((pixel & 0xF800) >> 11);
unsigned g = (7.0f / 63.0f) * ((pixel & 0x07E0) >> 5);
unsigned b = (3.0f / 31.0f) * ((pixel & 0x001F) >> 0);
unsigned r = ((pixel & 0xF800) >> 13);
unsigned g = ((pixel & 0x07E0) >> 8);
unsigned b = ((pixel & 0x001F) >> 3);
vga_frame[VGA_WIDTH * y + x] = (b << 6) | (g << 3) | r;
}
@ -369,12 +369,12 @@ static void vga_set_texture_frame(void *data,
for(x = 0; x < VGA_WIDTH; x++)
{
/* scale incoming frame to fit the screen */
unsigned scaled_x = (width / (float)VGA_WIDTH) * x;
unsigned scaled_y = (height / (float)VGA_HEIGHT) * y;
unsigned scaled_x = (width * x) / VGA_WIDTH;
unsigned scaled_y = (height * y) / VGA_HEIGHT;
unsigned short pixel = video_frame[width * scaled_y + scaled_x];
unsigned r = (7.0f / 15.0f) * ((pixel & 0xF000) >> 12);
unsigned g = (7.0f / 15.0f) * ((pixel & 0xF00) >> 8);
unsigned b = (3.0f / 15.0f) * ((pixel & 0xF0) >> 4);
unsigned r = ((pixel & 0xF000) >> 13);
unsigned g = ((pixel & 0xF00) >> 9);
unsigned b = ((pixel & 0xF0) >> 6);
vga_menu_frame[VGA_WIDTH * y + x] = (b << 6) | (g << 3) | r;
}
}