draw image

CMakeLists.txt

@@ -14,10 +14,12 @@ message(STATUS "----- GTK2_LINK_LIBRARIES: ${GTK2_LINK_LIBRARIES}")
 include_directories(${GTK2_INCLUDE_DIRS})
 link_directories(${GTK2_LIBRARY_DIRS})
 list(APPEND FC_DEP_LIBS ${GTK2_LIBRARIES})
+list(APPEND FC_DEP_LIBS freeimage)
 
 set(commom_src
     Rgba.cc 
     Raster.cc
+    Image.cc
 )
 
 add_subdirectory(src)

src/CMakeLists.txt

@@ -1,3 +1,6 @@
+add_executable(draw_image draw_image.cc ${commom_src})
+target_link_libraries (draw_image ${FC_DEP_LIBS})
+
 add_executable(draw_triangle draw_triangle.cc ${commom_src})
 target_link_libraries (draw_triangle ${FC_DEP_LIBS})
 

src/Image.cc

@@ -0,0 +1,37 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/* 
+ * File:   Image.cc
+ * Author: Blobt
+ * 
+ * Created on February 10, 2020, 5:55 PM
+ */
+
+#include "Image.h"
+#include <string.h>
+
+Image::Image(int width, int height, void* data) {
+    if (width == 0 || height == 0 || data == 0) {
+        _width = 0;
+        _height = 0;
+        _pixel = 0;
+    } else {
+        _width = width;
+        _height = height;
+        _pixel = new unsigned int[width * height];
+        memcpy(_pixel, data, width * height * sizeof (unsigned int));
+    }
+}
+
+Image::~Image() {
+    delete [] _pixel;
+}
+
+Rgba Image::pixelAt(int x, int y) const {
+    return Rgba(_pixel[y * _width + x]);
+}
+

src/Image.h

@@ -0,0 +1,77 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/* 
+ * File:   Image.h
+ * Author: Blobt
+ *
+ * Created on February 10, 2020, 5:55 PM
+ */
+
+#ifndef IMAGE_H
+#define IMAGE_H
+#include "Rgba.h"
+#include "FreeImage.h"
+#include "stdio.h"
+
+class Image {
+public:
+    Image(int width, int height, void* data);
+    virtual ~Image();
+
+    int width() const {
+        return _width;
+    }
+
+    int height() const {
+        return _height;
+    }
+
+    Rgba pixelAt(int x, int y) const;
+
+    static Image* loadFromFile(const char* fileName) {
+
+        //检查文件类型
+        FREE_IMAGE_FORMAT fifmt = FreeImage_GetFileType(fileName, 0);
+        if (fifmt == FIF_UNKNOWN) {
+            return 0;
+        }
+
+
+        //获取
+        FIBITMAP* dib = FreeImage_Load(fifmt, fileName, 0);
+
+        //转换
+        FIBITMAP* temp = dib;
+        dib = FreeImage_ConvertTo32Bits(dib);
+        FreeImage_Unload(temp);
+
+
+        BYTE* pixels = (BYTE*) FreeImage_GetBits(dib);
+        int width = FreeImage_GetWidth(dib);
+        int height = FreeImage_GetHeight(dib);
+
+        //颜色为数调换
+        for (int i = 0; i < width * height * 4; i += 4) {
+            BYTE temp = pixels[i];
+            pixels[i] = pixels[i + 2];
+            pixels[i + 2] = temp;
+        }
+
+
+        Image* image = new Image(width, height, (void*) pixels);
+        FreeImage_Unload(dib);
+
+        return image;
+
+    }
+private:
+    int _width;
+    int _height;
+    unsigned int* _pixel;
+};
+#endif /* IMAGE_H */
+

src/Raster.cc

@@ -13,6 +13,7 @@
 
 #include "Rgba.h"
 #include "Raster.h"
+#include "Image.h"
 #include <stdio.h>
 #include <iostream>
 #include <string.h>
@@ -35,11 +36,13 @@ void Raster::drawPoint(int x, int y, Rgba color, int pointSize) {
     switch (pointSize) {
         case 1:
             setPixel(x, y, color);
+            break;
         case 2:
             setPixel(x, y, color);
             setPixel(x + 1, y, color);
             setPixel(x, y + 1, color);
             setPixel(x + 1, y + 1, color);
+            break;
         case 3:
             setPixel(x - 1, y - 1, color);
             setPixel(x, y - 1, color);
@@ -52,6 +55,7 @@ void Raster::drawPoint(int x, int y, Rgba color, int pointSize) {
             setPixel(x - 1, y + 1, color);
             setPixel(x, y + 1, color);
             setPixel(x + 1, y + 1, color);
+            break;
     }
 }
 
@@ -163,13 +167,13 @@ void Raster::drawSpan(const Span &span) {
 
     Rgba color;
     float length = span.xEnd - span.xStart;
-    
-    
+
+
     int startX = tmax<int>(span.xStart, 0);
     int endX = tmin<int>(span.xEnd, _width);
-    
+
     float scale = (startX - span.xStart) / length;
-    
+
     //优化3 x轴越界处理
     for (int i = startX; i <= endX; i++) {
         color = colorLerp(span.color1, span.color2, (float) (i - startX) / length);
@@ -339,6 +343,22 @@ void Raster::drawRect(const int2* points, const Rgba* colors) {
     }
 }
 
+void Raster::drawImage(int startX, int startY, const Image* image) {
+    /*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);
+            drawPoint(x, y, color);
+        }
+    }
+}
+
 int Raster::size() {
     return _width * _height * sizeof (Rgba);
 }

src/Raster.h

@@ -16,6 +16,7 @@
 
 #include "common.h"
 #include "Rgba.h"
+#include "Image.h"
 
 enum DRAWMODE {
     DM_POINTS = 0,
@@ -94,6 +95,7 @@ public:
     void drawArray(DRAWMODE mode, const float2* points, size_t count);
     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);
     int size();
     void clean();
     bool setPixel(int x, int y, Rgba color);

src/Rgba.cc

@@ -24,6 +24,10 @@ Rgba::Rgba(unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
     _a = a;
 }
 
+Rgba::Rgba(unsigned int rgba) {
+    _color = rgba;
+}
+
 bool operator==(Rgba &left, Rgba &right) {
     return left._a == right._a && left._b == right._b && left._g == right._g && left._r == right._r;
 }
@@ -35,7 +39,7 @@ bool operator!=(Rgba &left, Rgba &right) {
 Rgba::operator unsigned() {
     unsigned int ret;
 
-    unsigned char* p = (unsigned char*)&ret;
+    unsigned char* p = (unsigned char*) &ret;
     p[0] = _r;
     p[1] = _g;
     p[2] = _b;
@@ -43,14 +47,14 @@ Rgba::operator unsigned() {
 
     //bitset<32> set = ret;
     //cout << set << endl;
-    
+
     return ret;
 }
 
 Rgba::operator int() {
     int ret;
 
-    unsigned char* p = (unsigned char*)&ret;
+    unsigned char* p = (unsigned char*) &ret;
     p[0] = _r;
     p[1] = _g;
     p[2] = _b;
@@ -62,7 +66,7 @@ Rgba::operator int() {
 Rgba::operator long() {
     long ret;
 
-    unsigned char* p = (unsigned char*)&ret ;
+    unsigned char* p = (unsigned char*) &ret;
     p[0] = _r;
     p[1] = _g;
     p[2] = _b;

src/Rgba.h

@@ -19,16 +19,25 @@
 class Rgba {
 public:
     Rgba(unsigned char r = 0, unsigned char g = 0, unsigned char b = 0, unsigned char a = 0);
+    Rgba(unsigned int rgba);
     friend bool operator==(Rgba &left, Rgba &right);
     friend bool operator!=(Rgba &left, Rgba &righe);
     operator unsigned();
     operator int();
     operator long();
 public:
-    unsigned char _r;
-    unsigned char _g;
-    unsigned char _b;
-    unsigned char _a;
+
+    /*这里使用了联合，可以是类能使用unsigned int 直接赋值*/
+    union {
+
+        struct {
+            unsigned char _r;
+            unsigned char _g;
+            unsigned char _b;
+            unsigned char _a;
+        };
+        unsigned int _color;
+    };
 };
 
 inline Rgba colorLerp(const Rgba& color1, const Rgba& color2, float step) {

src/draw_image.cc

@@ -0,0 +1,71 @@
+#include <iostream>
+#include <math.h>
+#include <cairo.h>
+#include <gtk/gtk.h>
+#include "Rgba.h"
+#include "Raster.h"
+#include "common.h"
+#include "Image.h"
+
+using namespace std;
+
+
+gint height = 500;
+gint width = 500;
+
+Raster raster(width, height);
+
+unsigned char* makeBitmap() {
+    raster.clean();
+
+    Image* image = Image::loadFromFile("/home/blobt/Documents/dev/cpp/3dbase/build/bin/12.jpg");
+
+    raster.drawImage(25, 25, image);
+
+    return (unsigned char*) raster.buffer;
+}
+
+void render(GtkWidget *widget) {
+    //允许窗口可以绘图
+    gtk_widget_set_app_paintable(widget, TRUE);
+    gtk_widget_realize(widget);
+    gtk_widget_queue_draw(widget);
+
+    //模拟一张图片
+    unsigned char* data = makeBitmap();
+
+    GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB, TRUE, 8, width, height, width * 4, NULL, NULL);
+
+    GdkPixmap *pixmap = NULL;
+
+    gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap, NULL, 128);
+
+    gdk_window_set_back_pixmap(widget->window, pixmap, FALSE);
+
+    g_object_unref(pixbuf);
+    g_object_unref(pixmap);
+    //delete data;
+}
+
+int main(int argc, char* argv[]) {
+
+    gtk_init(&argc, &argv);
+
+    //创建窗口
+    GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+    gtk_widget_set_size_request(window, width, height);
+
+    gtk_window_set_title(GTK_WINDOW(window), "Gtk testing");
+    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER_ALWAYS);
+
+    //窗口关闭时候，关闭程序
+    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
+    //设置渲染
+    g_signal_connect(window, "expose-event", G_CALLBACK(render), window);
+
+
+    gtk_widget_show_all(window);
+    gtk_main();
+
+    return 0;
+}