From 36d89a6ac257e28357620d27d3c32970a71e7c35 Mon Sep 17 00:00:00 2001
From: blobt <380255922@qq.com>
Date: Tue, 11 Feb 2020 17:14:38 +0800
Subject: [PATCH] color key

---
 src/Raster.cc     | 22 ++++++++++++++++++--
 src/Raster.h      |  1 +
 src/Rgba.h        |  2 +-
 src/draw_image.cc | 51 ++++++++++++++++++++++++++++++++++++++++++-----
 4 files changed, 68 insertions(+), 8 deletions(-)

diff --git a/src/Raster.cc b/src/Raster.cc
index 200bd49..d942af9 100644
--- a/src/Raster.cc
+++ b/src/Raster.cc
@@ -354,7 +354,25 @@ void Raster::drawImage(int startX, int startY, const Image* image) {
     for (int x = left; x < right; x++) {
         for (int y = bottom; y < top; y++) {
             Rgba color = image->pixelAt(x - left, y - bottom);
-            drawPoint(x, y, color);
+            setPixel(x, y, color);
+        }
+    }
+}
+
+void Raster::drawImageWithKey(int startX, int startY, const Image* image, Rgba key) {
+    /*越界部分不描画*/
+    int left = tmax<int>(startX, 0);
+    int bottom = tmax<int>(startY, 0);
+
+    int right = tmin<int>(startX + image->width(), _width);
+    int top = tmin<int>(startY + image->height(), _height);
+
+    for (int x = left; x < right; x++) {
+        for (int y = bottom; y < top; y++) {
+            Rgba color = image->pixelAt(x - left, y - bottom);
+            if (color != key) {
+                setPixel(x, y, color);
+            }
         }
     }
 }
@@ -372,7 +390,7 @@ bool Raster::setPixel(int x, int y, Rgba color) {
         return false;
     }
     //行列是反的
-    buffer[ (_height - y) * _width + x] = color;
+    buffer[ ((_height - 1) - y) * _width + x] = color;
 }
 
 bool Raster::isIn(int2 point) {
diff --git a/src/Raster.h b/src/Raster.h
index 45d5212..559e54b 100644
--- a/src/Raster.h
+++ b/src/Raster.h
@@ -96,6 +96,7 @@ public:
     void drawFilledRect(int startX, int startY, int width, int height);
     void drawRect(const int2* points, const Rgba* colors);
     void drawImage(int startX, int startY, const Image* image);
+    void drawImageWithKey(int startX, int startY, const Image* image, Rgba key);
     int size();
     void clean();
     bool setPixel(int x, int y, Rgba color);
diff --git a/src/Rgba.h b/src/Rgba.h
index b7ae512..3550265 100644
--- a/src/Rgba.h
+++ b/src/Rgba.h
@@ -18,7 +18,7 @@
 
 class Rgba {
 public:
-    Rgba(unsigned char r = 0, unsigned char g = 0, unsigned char b = 0, unsigned char a = 0);
+    Rgba(unsigned char r = 0, unsigned char g = 0, unsigned char b = 0, unsigned char a = 255);
     Rgba(unsigned int rgba);
     friend bool operator==(Rgba &left, Rgba &right);
     friend bool operator!=(Rgba &left, Rgba &righe);
diff --git a/src/draw_image.cc b/src/draw_image.cc
index a7dfd08..9361e02 100644
--- a/src/draw_image.cc
+++ b/src/draw_image.cc
@@ -6,21 +6,62 @@
 #include "Raster.h"
 #include "common.h"
 #include "Image.h"
+#include <malloc.h>
 
 using namespace std;
 
 
-gint height = 500;
-gint width = 500;
+gint height = 600;
+gint width = 800;
 
 Raster raster(width, height);
 
+void example1() {
+        //画背景
+        Image* image1 = Image::loadFromFile("/home/blobt/Documents/dev/cpp/3dbase/build/bin/image/bg.png");
+        raster.drawImage(0, 0, image1);
+        delete image1;
+    
+        //画前景
+        Image* image2 = Image::loadFromFile("/home/blobt/Documents/dev/cpp/3dbase/build/bin/image/colorKey.bmp");
+        raster.drawImageWithKey(200, 250, image2, Rgba(255, 0, 0));
+        delete image2;
+
+}
+
+void example2() {
+    int left = 0;
+    int bottom = 0;
+
+    int right = 300;
+    int top = 100;
+
+    Rgba* t = new Rgba[800 * 600];
+
+
+    for (int i = 0; i < 800 * 600; i++) {
+        t[i] = Rgba(255, 255, 255);
+    }
+
+    int ys = 0;
+    for (int y = bottom; y < top; y++) {
+        ys++;
+        for (int x = left; x < right; x++) {
+            //raster.setPixel(x, y, Rgba(255, 0, 0));
+            t[(height - ys) * width + x] = Rgba(255, 0, 0);
+        }
+    }
+
+    memcpy(raster.buffer, t, 800 * 600 * 4);
+
+
+    delete t;
+}
+
 unsigned char* makeBitmap() {
     raster.clean();
 
-    Image* image = Image::loadFromFile("/home/blobt/Documents/dev/cpp/3dbase/build/bin/12.jpg");
-
-    raster.drawImage(25, 25, image);
+    example1();
 
     return (unsigned char*) raster.buffer;
 }