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Added comments to code

This commit is contained in:
Duncan Frost 2014-05-25 09:42:29 +01:00
parent af33568f01
commit 775ce9e83d
1 changed files with 32 additions and 4 deletions
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36
src/gfx.c
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@ -553,7 +553,7 @@ void gfx_bmp_sprite_to_buffer(uint8* palette_pointer, uint8* source_pointer, uin
if (RCT2_GLOBAL(0x9E3CDC, uint32) != 0){//Not tested. I can't actually work out when this code runs.
uint32 _ebp = RCT2_GLOBAL(0x9E3CDC, uint32);
_ebp += source_pointer - source_image->offset;// RCT2_GLOBAL(0x9E3CE0, uint32);
_ebp += source_pointer - source_image->offset;
for (; height > 0; --height){
for (int no_pixels = width; no_pixels > 0; --no_pixels){
@ -825,55 +825,83 @@ void gfx_draw_sprite(rct_drawpixelinfo *dpi, int image_id, int x, int y)
return;
}
//This will be the height of the drawn image
int height = g1_source->height;
//This is the start y coordinate on the destination
int dest_start_y = y - dpi->y + g1_source->y_offset;
//This is the start y coordinate on the source
int source_start_y = 0;
if (dest_start_y < 0){
//If the destination y is negative reduce the height of the
//image as we will cut off the bottom
height += dest_start_y;
//If the image is no longer visible nothing to draw
if (height <= 0){
return;
}
//The source image will start a further up the image
source_start_y -= dest_start_y;
//The destination start is now reset to 0
dest_start_y = 0;
}
int dest_end_y = dest_start_y + height;
if (dest_end_y > dpi->height){
//If the destination y is outside of the drawing
//image reduce the height of the image
height -= dest_end_y - dpi->height;
//If the image no longer has anything to draw
if (height <= 0)return;
}
//This will be the width of the drawn image
int width = g1_source->width;
//This is the source start x coordinate
int source_start_x = 0;
//This is the destination start x coordinate
int dest_start_x = x - dpi->x + g1_source->x_offset;
if (dest_start_x < 0){
//If the destination is negative reduce the width
//image will cut off the side
width += dest_start_x;
//If there is no image to draw
if (width <= 0){
return;
}
//The source start will also need to cut off the side
source_start_x -= dest_start_x;
//Reset the destination to 0
dest_start_x = 0;
}
int end_x = dest_start_x + width;
int dest_end_x = dest_start_x + width;
if (end_x > dpi->width){
width -= end_x - dpi->width;
if (dest_end_x > dpi->width){
//If the destination x is outside of the drawing area
//reduce the image width.
width -= dest_end_x - dpi->width;
//If there is no image to draw.
if (width <= 0)return;
}
uint8* dest_pointer = (uint8*)dpi->bits;
//Move the pointer to the start point of the destination
dest_pointer += (dpi->width + dpi->pitch)*dest_start_y + dest_start_x;
if (g1_source->flags & G1_FLAG_RLE_COMPRESSION){
//We have to use a different method to move the source pointer for
//rle encoded sprites so that will be handled within this function
gfx_rle_sprite_to_buffer(g1_source->offset, dest_pointer, palette_pointer, dpi, image_type, source_start_y, height, source_start_x, width);
return;
}
uint8* source_pointer = g1_source->offset;
//Move the pointer to the start point of the source
source_pointer += g1_source->width*source_start_y + source_start_x;
if (!(g1_source->flags & 0x02)){